Revert "YT-19324: move YT provider to ydb/library/yql"

This reverts commit ca272f12fdd0e8d5c3e957fc87939148f1caaf72, reversing
changes made to 49f8acfc8b0b5c0071b804423bcf53fda26c7c12.

1 files changed, 0 insertions, 1782 deletions

diff --git a/contrib/libs/flatbuffers/src/idl_gen_python.cpp b/contrib/libs/flatbuffers/src/idl_gen_python.cpp
deleted file mode 100644
index b3f394ebf9e..00000000000
--- a/contrib/libs/flatbuffers/src/idl_gen_python.cpp
+++ /dev/null
@@ -1,1782 +0,0 @@
-/*
- * Copyright 2014 Google Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// independent from idl_parser, since this code is not needed for most clients
-
-#include <cctype>
-#include <set>
-#include <string>
-#include <unordered_set>
-#include <vector>
-
-#include "flatbuffers/code_generators.h"
-#include "flatbuffers/flatbuffers.h"
-#include "flatbuffers/idl.h"
-#include "flatbuffers/util.h"
-
-namespace flatbuffers {
-namespace python {
-
-// Hardcode spaces per indentation.
-const CommentConfig def_comment = { nullptr, "#", nullptr };
-const std::string Indent = "    ";
-
-class PythonGenerator : public BaseGenerator {
- public:
-  PythonGenerator(const Parser &parser, const std::string &path,
-                  const std::string &file_name)
-      : BaseGenerator(parser, path, file_name, "" /* not used */,
-                      "" /* not used */, "py"),
-        float_const_gen_("float('nan')", "float('inf')", "float('-inf')") {
-    static const char *const keywords[] = {
-      "False",   "None",     "True",     "and",    "as",   "assert", "break",
-      "class",   "continue", "def",      "del",    "elif", "else",   "except",
-      "finally", "for",      "from",     "global", "if",   "import", "in",
-      "is",      "lambda",   "nonlocal", "not",    "or",   "pass",   "raise",
-      "return",  "try",      "while",    "with",   "yield"
-    };
-    keywords_.insert(std::begin(keywords), std::end(keywords));
-  }
-
-  // Most field accessors need to retrieve and test the field offset first,
-  // this is the prefix code for that.
-  std::string OffsetPrefix(const FieldDef &field) {
-    return "\n" + Indent + Indent +
-           "o = flatbuffers.number_types.UOffsetTFlags.py_type" +
-           "(self._tab.Offset(" + NumToString(field.value.offset) + "))\n" +
-           Indent + Indent + "if o != 0:\n";
-  }
-
-  // Begin a class declaration.
-  void BeginClass(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "class " + NormalizedName(struct_def) + "(object):\n";
-    code += Indent + "__slots__ = ['_tab']";
-    code += "\n\n";
-  }
-
-  // Begin enum code with a class declaration.
-  void BeginEnum(const std::string &class_name, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "class " + class_name + "(object):\n";
-  }
-
-  std::string EscapeKeyword(const std::string &name) const {
-    return keywords_.find(name) == keywords_.end() ? name : name + "_";
-  }
-
-  std::string NormalizedName(const Definition &definition) const {
-    return EscapeKeyword(definition.name);
-  }
-
-  std::string NormalizedName(const EnumVal &ev) const {
-    return EscapeKeyword(ev.name);
-  }
-
-  // Converts the name of a definition into upper Camel format.
-  std::string MakeUpperCamel(const Definition &definition) const {
-    return MakeCamel(NormalizedName(definition), true);
-  }
-
-  // Converts the name of a definition into lower Camel format.
-  std::string MakeLowerCamel(const Definition &definition) const {
-    auto name = MakeCamel(NormalizedName(definition), false);
-    name[0] = CharToLower(name[0]);
-    return name;
-  }
-
-  // Starts a new line and then indents.
-  std::string GenIndents(int num) {
-    return "\n" + std::string(num * Indent.length(), ' ');
-  }
-
-  // A single enum member.
-  void EnumMember(const EnumDef &enum_def, const EnumVal &ev,
-                  std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += Indent;
-    code += NormalizedName(ev);
-    code += " = ";
-    code += enum_def.ToString(ev) + "\n";
-  }
-
-  // End enum code.
-  void EndEnum(std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "\n";
-  }
-
-  // Initialize a new struct or table from existing data.
-  void NewRootTypeFromBuffer(const StructDef &struct_def,
-                             std::string *code_ptr) {
-    auto &code = *code_ptr;
-
-    code += Indent + "@classmethod\n";
-    code += Indent + "def GetRootAs";
-    code += "(cls, buf, offset=0):";
-    code += "\n";
-    code += Indent + Indent;
-    code += "n = flatbuffers.encode.Get";
-    code += "(flatbuffers.packer.uoffset, buf, offset)\n";
-    code += Indent + Indent + "x = " + NormalizedName(struct_def) + "()\n";
-    code += Indent + Indent + "x.Init(buf, n + offset)\n";
-    code += Indent + Indent + "return x\n";
-    code += "\n";
-
-    // Add an alias with the old name
-    code += Indent + "@classmethod\n";
-    code += Indent + "def GetRootAs";
-    code += NormalizedName(struct_def);
-    code += "(cls, buf, offset=0):\n";
-    code += Indent + Indent + "\"\"\"This method is deprecated. Please switch to GetRootAs.\"\"\"\n";
-    code += Indent + Indent + "return cls.GetRootAs(buf, offset)\n";
-  }
-
-  // Initialize an existing object with other data, to avoid an allocation.
-  void InitializeExisting(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-
-    GenReceiver(struct_def, code_ptr);
-    code += "Init(self, buf, pos):\n";
-    code += Indent + Indent + "self._tab = flatbuffers.table.Table(buf, pos)\n";
-    code += "\n";
-  }
-
-  // Get the length of a vector.
-  void GetVectorLen(const StructDef &struct_def, const FieldDef &field,
-                    std::string *code_ptr) {
-    auto &code = *code_ptr;
-
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field)) + "Length(self";
-    code += "):" + OffsetPrefix(field);
-    code += Indent + Indent + Indent + "return self._tab.VectorLen(o)\n";
-    code += Indent + Indent + "return 0\n\n";
-  }
-
-  // Determines whether a vector is none or not.
-  void GetVectorIsNone(const StructDef &struct_def, const FieldDef &field,
-                       std::string *code_ptr) {
-    auto &code = *code_ptr;
-
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field)) + "IsNone(self";
-    code += "):";
-    code += GenIndents(2) +
-            "o = flatbuffers.number_types.UOffsetTFlags.py_type" +
-            "(self._tab.Offset(" + NumToString(field.value.offset) + "))";
-    code += GenIndents(2) + "return o == 0";
-    code += "\n\n";
-  }
-
-  // Get the value of a struct's scalar.
-  void GetScalarFieldOfStruct(const StructDef &struct_def,
-                              const FieldDef &field, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    std::string getter = GenGetter(field.value.type);
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field));
-    code += "(self): return " + getter;
-    code += "self._tab.Pos + flatbuffers.number_types.UOffsetTFlags.py_type(";
-    code += NumToString(field.value.offset) + "))\n";
-  }
-
-  // Get the value of a table's scalar.
-  void GetScalarFieldOfTable(const StructDef &struct_def, const FieldDef &field,
-                             std::string *code_ptr) {
-    auto &code = *code_ptr;
-    std::string getter = GenGetter(field.value.type);
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field));
-    code += "(self):";
-    code += OffsetPrefix(field);
-    getter += "o + self._tab.Pos)";
-    auto is_bool = IsBool(field.value.type.base_type);
-    if (is_bool) { getter = "bool(" + getter + ")"; }
-    code += Indent + Indent + Indent + "return " + getter + "\n";
-    std::string default_value;
-    if (is_bool) {
-      default_value = field.value.constant == "0" ? "False" : "True";
-    } else {
-      default_value = IsFloat(field.value.type.base_type)
-                          ? float_const_gen_.GenFloatConstant(field)
-                          : field.value.constant;
-    }
-    code += Indent + Indent + "return " + default_value + "\n\n";
-  }
-
-  // Get a struct by initializing an existing struct.
-  // Specific to Struct.
-  void GetStructFieldOfStruct(const StructDef &struct_def,
-                              const FieldDef &field, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field));
-    code += "(self, obj):\n";
-    code += Indent + Indent + "obj.Init(self._tab.Bytes, self._tab.Pos + ";
-    code += NumToString(field.value.offset) + ")";
-    code += "\n" + Indent + Indent + "return obj\n\n";
-  }
-
-  // Get the value of a fixed size array.
-  void GetArrayOfStruct(const StructDef &struct_def, const FieldDef &field,
-                        std::string *code_ptr) {
-    auto &code = *code_ptr;
-    const auto vec_type = field.value.type.VectorType();
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field));
-    if (IsStruct(vec_type)) {
-      code += "(self, obj, i):\n";
-      code += Indent + Indent + "obj.Init(self._tab.Bytes, self._tab.Pos + ";
-      code += NumToString(field.value.offset) + " + i * ";
-      code += NumToString(InlineSize(vec_type));
-      code += ")\n" + Indent + Indent + "return obj\n\n";
-    } else {
-      auto getter = GenGetter(vec_type);
-      code += "(self): return [" + getter;
-      code += "self._tab.Pos + flatbuffers.number_types.UOffsetTFlags.py_type(";
-      code += NumToString(field.value.offset) + " + i * ";
-      code += NumToString(InlineSize(vec_type));
-      code += ")) for i in range(";
-      code += NumToString(field.value.type.fixed_length) + ")]\n";
-    }
-  }
-
-  // Get a struct by initializing an existing struct.
-  // Specific to Table.
-  void GetStructFieldOfTable(const StructDef &struct_def, const FieldDef &field,
-                             std::string *code_ptr) {
-    auto &code = *code_ptr;
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field));
-    code += "(self):";
-    code += OffsetPrefix(field);
-    if (field.value.type.struct_def->fixed) {
-      code += Indent + Indent + Indent + "x = o + self._tab.Pos\n";
-    } else {
-      code += Indent + Indent + Indent;
-      code += "x = self._tab.Indirect(o + self._tab.Pos)\n";
-    }
-    if (parser_.opts.include_dependence_headers) {
-      code += Indent + Indent + Indent;
-      code += "from " + GenPackageReference(field.value.type) + " import " +
-              TypeName(field) + "\n";
-    }
-    code += Indent + Indent + Indent + "obj = " + TypeName(field) + "()\n";
-    code += Indent + Indent + Indent + "obj.Init(self._tab.Bytes, x)\n";
-    code += Indent + Indent + Indent + "return obj\n";
-    code += Indent + Indent + "return None\n\n";
-  }
-
-  // Get the value of a string.
-  void GetStringField(const StructDef &struct_def, const FieldDef &field,
-                      std::string *code_ptr) {
-    auto &code = *code_ptr;
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field));
-    code += "(self):";
-    code += OffsetPrefix(field);
-    code += Indent + Indent + Indent + "return " + GenGetter(field.value.type);
-    code += "o + self._tab.Pos)\n";
-    code += Indent + Indent + "return None\n\n";
-  }
-
-  // Get the value of a union from an object.
-  void GetUnionField(const StructDef &struct_def, const FieldDef &field,
-                     std::string *code_ptr) {
-    auto &code = *code_ptr;
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field)) + "(self):";
-    code += OffsetPrefix(field);
-
-    // TODO(rw): this works and is not the good way to it:
-    bool is_native_table = TypeName(field) == "*flatbuffers.Table";
-    if (is_native_table) {
-      code +=
-          Indent + Indent + Indent + "from flatbuffers.table import Table\n";
-    } else if (parser_.opts.include_dependence_headers) {
-      code += Indent + Indent + Indent;
-      code += "from " + GenPackageReference(field.value.type) + " import " +
-              TypeName(field) + "\n";
-    }
-    code += Indent + Indent + Indent + "obj = Table(bytearray(), 0)\n";
-    code += Indent + Indent + Indent + GenGetter(field.value.type);
-    code += "obj, o)\n" + Indent + Indent + Indent + "return obj\n";
-    code += Indent + Indent + "return None\n\n";
-  }
-
-  // Generate the package reference when importing a struct or enum from its
-  // module.
-  std::string GenPackageReference(const Type &type) {
-    Namespace *namespaces;
-    if (type.struct_def) {
-      namespaces = type.struct_def->defined_namespace;
-    } else if (type.enum_def) {
-      namespaces = type.enum_def->defined_namespace;
-    } else {
-      return "." + GenTypeGet(type);
-    }
-
-    return namespaces->GetFullyQualifiedName(GenTypeGet(type));
-  }
-
-  // Get the value of a vector's struct member.
-  void GetMemberOfVectorOfStruct(const StructDef &struct_def,
-                                 const FieldDef &field, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto vectortype = field.value.type.VectorType();
-
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field));
-    code += "(self, j):" + OffsetPrefix(field);
-    code += Indent + Indent + Indent + "x = self._tab.Vector(o)\n";
-    code += Indent + Indent + Indent;
-    code += "x += flatbuffers.number_types.UOffsetTFlags.py_type(j) * ";
-    code += NumToString(InlineSize(vectortype)) + "\n";
-    if (!(vectortype.struct_def->fixed)) {
-      code += Indent + Indent + Indent + "x = self._tab.Indirect(x)\n";
-    }
-    if (parser_.opts.include_dependence_headers) {
-      code += Indent + Indent + Indent;
-      code += "from " + GenPackageReference(field.value.type) + " import " +
-              TypeName(field) + "\n";
-    }
-    code += Indent + Indent + Indent + "obj = " + TypeName(field) + "()\n";
-    code += Indent + Indent + Indent + "obj.Init(self._tab.Bytes, x)\n";
-    code += Indent + Indent + Indent + "return obj\n";
-    code += Indent + Indent + "return None\n\n";
-  }
-
-  // Get the value of a vector's non-struct member. Uses a named return
-  // argument to conveniently set the zero value for the result.
-  void GetMemberOfVectorOfNonStruct(const StructDef &struct_def,
-                                    const FieldDef &field,
-                                    std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto vectortype = field.value.type.VectorType();
-
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field));
-    code += "(self, j):";
-    code += OffsetPrefix(field);
-    code += Indent + Indent + Indent + "a = self._tab.Vector(o)\n";
-    code += Indent + Indent + Indent;
-    code += "return " + GenGetter(field.value.type);
-    code += "a + flatbuffers.number_types.UOffsetTFlags.py_type(j * ";
-    code += NumToString(InlineSize(vectortype)) + "))\n";
-    if (IsString(vectortype)) {
-      code += Indent + Indent + "return \"\"\n";
-    } else {
-      code += Indent + Indent + "return 0\n";
-    }
-    code += "\n";
-  }
-
-  // Returns a non-struct vector as a numpy array. Much faster
-  // than iterating over the vector element by element.
-  void GetVectorOfNonStructAsNumpy(const StructDef &struct_def,
-                                   const FieldDef &field,
-                                   std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto vectortype = field.value.type.VectorType();
-
-    // Currently, we only support accessing as numpy array if
-    // the vector type is a scalar.
-    if (!(IsScalar(vectortype.base_type))) { return; }
-
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field)) + "AsNumpy(self):";
-    code += OffsetPrefix(field);
-
-    code += Indent + Indent + Indent;
-    code += "return ";
-    code += "self._tab.GetVectorAsNumpy(flatbuffers.number_types.";
-    code += MakeCamel(GenTypeGet(field.value.type));
-    code += "Flags, o)\n";
-
-    if (IsString(vectortype)) {
-      code += Indent + Indent + "return \"\"\n";
-    } else {
-      code += Indent + Indent + "return 0\n";
-    }
-    code += "\n";
-  }
-
-  // Returns a nested flatbuffer as itself.
-  void GetVectorAsNestedFlatbuffer(const StructDef &struct_def,
-                                   const FieldDef &field,
-                                   std::string *code_ptr) {
-    auto nested = field.attributes.Lookup("nested_flatbuffer");
-    if (!nested) { return; }  // There is no nested flatbuffer.
-
-    std::string unqualified_name = nested->constant;
-    std::string qualified_name = nested->constant;
-    auto nested_root = parser_.LookupStruct(nested->constant);
-    if (nested_root == nullptr) {
-      qualified_name =
-          parser_.current_namespace_->GetFullyQualifiedName(nested->constant);
-      nested_root = parser_.LookupStruct(qualified_name);
-    }
-    FLATBUFFERS_ASSERT(nested_root);  // Guaranteed to exist by parser.
-    (void)nested_root;
-
-    auto &code = *code_ptr;
-    GenReceiver(struct_def, code_ptr);
-    code += MakeCamel(NormalizedName(field)) + "NestedRoot(self):";
-
-    code += OffsetPrefix(field);
-
-    code += Indent + Indent + Indent;
-    code += "from " + qualified_name + " import " + unqualified_name + "\n";
-    code += Indent + Indent + Indent + "return " + unqualified_name;
-    code += ".GetRootAs";
-    code += "(self._tab.Bytes, self._tab.Vector(o))\n";
-    code += Indent + Indent + "return 0\n";
-    code += "\n";
-  }
-
-  // Begin the creator function signature.
-  void BeginBuilderArgs(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-
-    code += "\n";
-    code += "def Create" + NormalizedName(struct_def);
-    code += "(builder";
-  }
-
-  // Recursively generate arguments for a constructor, to deal with nested
-  // structs.
-  void StructBuilderArgs(const StructDef &struct_def,
-                         const std::string nameprefix,
-                         const std::string namesuffix, bool has_field_name,
-                         const std::string fieldname_suffix,
-                         std::string *code_ptr) {
-    for (auto it = struct_def.fields.vec.begin();
-         it != struct_def.fields.vec.end(); ++it) {
-      auto &field = **it;
-      const auto &field_type = field.value.type;
-      const auto &type =
-          IsArray(field_type) ? field_type.VectorType() : field_type;
-      if (IsStruct(type)) {
-        // Generate arguments for a struct inside a struct. To ensure names
-        // don't clash, and to make it obvious these arguments are constructing
-        // a nested struct, prefix the name with the field name.
-        auto subprefix = nameprefix;
-        if (has_field_name) {
-          subprefix += NormalizedName(field) + fieldname_suffix;
-        }
-        StructBuilderArgs(*field.value.type.struct_def, subprefix, namesuffix,
-                          has_field_name, fieldname_suffix, code_ptr);
-      } else {
-        auto &code = *code_ptr;
-        code += std::string(", ") + nameprefix;
-        if (has_field_name) { code += MakeCamel(NormalizedName(field), false); }
-        code += namesuffix;
-      }
-    }
-  }
-
-  // End the creator function signature.
-  void EndBuilderArgs(std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "):\n";
-  }
-
-  // Recursively generate struct construction statements and instert manual
-  // padding.
-  void StructBuilderBody(const StructDef &struct_def, const char *nameprefix,
-                         std::string *code_ptr, size_t index = 0,
-                         bool in_array = false) {
-    auto &code = *code_ptr;
-    std::string indent(index * 4, ' ');
-    code +=
-        indent + "    builder.Prep(" + NumToString(struct_def.minalign) + ", ";
-    code += NumToString(struct_def.bytesize) + ")\n";
-    for (auto it = struct_def.fields.vec.rbegin();
-         it != struct_def.fields.vec.rend(); ++it) {
-      auto &field = **it;
-      const auto &field_type = field.value.type;
-      const auto &type =
-          IsArray(field_type) ? field_type.VectorType() : field_type;
-      if (field.padding)
-        code +=
-            indent + "    builder.Pad(" + NumToString(field.padding) + ")\n";
-      if (IsStruct(field_type)) {
-        StructBuilderBody(*field_type.struct_def,
-                          (nameprefix + (NormalizedName(field) + "_")).c_str(),
-                          code_ptr, index, in_array);
-      } else {
-        const auto index_var = "_idx" + NumToString(index);
-        if (IsArray(field_type)) {
-          code += indent + "    for " + index_var + " in range(";
-          code += NumToString(field_type.fixed_length);
-          code += " , 0, -1):\n";
-          in_array = true;
-        }
-        if (IsStruct(type)) {
-          StructBuilderBody(
-              *field_type.struct_def,
-              (nameprefix + (NormalizedName(field) + "_")).c_str(), code_ptr,
-              index + 1, in_array);
-        } else {
-          code += IsArray(field_type) ? "    " : "";
-          code += indent + "    builder.Prepend" + GenMethod(field) + "(";
-          code += nameprefix + MakeCamel(NormalizedName(field), false);
-          size_t array_cnt = index + (IsArray(field_type) ? 1 : 0);
-          for (size_t i = 0; in_array && i < array_cnt; i++) {
-            code += "[_idx" + NumToString(i) + "-1]";
-          }
-          code += ")\n";
-        }
-      }
-    }
-  }
-
-  void EndBuilderBody(std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "    return builder.Offset()\n";
-  }
-
-  // Get the value of a table's starting offset.
-  void GetStartOfTable(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "def Start(builder): ";
-    code += "builder.StartObject(";
-    code += NumToString(struct_def.fields.vec.size());
-    code += ")\n";
-
-    // Add alias with the old name.
-    code += "def " + NormalizedName(struct_def) + "Start(builder):\n";
-    code += Indent + "\"\"\"This method is deprecated. Please switch to Start.\"\"\"\n";
-    code += Indent + "return Start(builder)\n";
-  }
-
-  // Set the value of a table's field.
-  void BuildFieldOfTable(const StructDef &struct_def, const FieldDef &field,
-                         const size_t offset, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "def Add" + MakeCamel(NormalizedName(field));
-    code += "(builder, ";
-    code += MakeCamel(NormalizedName(field), false);
-    code += "): ";
-    code += "builder.Prepend";
-    code += GenMethod(field) + "Slot(";
-    code += NumToString(offset) + ", ";
-    if (!IsScalar(field.value.type.base_type) && (!struct_def.fixed)) {
-      code += "flatbuffers.number_types.UOffsetTFlags.py_type";
-      code += "(";
-      code += MakeCamel(NormalizedName(field), false) + ")";
-    } else {
-      code += MakeCamel(NormalizedName(field), false);
-    }
-    code += ", ";
-    code += IsFloat(field.value.type.base_type)
-                ? float_const_gen_.GenFloatConstant(field)
-                : field.value.constant;
-    code += ")\n";
-
-    // Add alias with the old name.
-    code += "def " + NormalizedName(struct_def) + "Add" + MakeCamel(NormalizedName(field));
-    code += "(builder, ";
-    code += MakeCamel(NormalizedName(field), false);
-    code += "):\n";
-    code += Indent + "\"\"\"This method is deprecated. Please switch to Add";
-    code += MakeCamel(NormalizedName(field)) + ".\"\"\"\n";
-    code += Indent + "return Add" + MakeCamel(NormalizedName(field));
-    code += "(builder, ";
-    code += MakeCamel(NormalizedName(field), false);
-    code += ")\n";
-
-    // Add alias with the old name.
-  }
-
-  // Set the value of one of the members of a table's vector.
-  void BuildVectorOfTable(const StructDef &struct_def, const FieldDef &field,
-                          std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "def Start";
-    code += MakeCamel(NormalizedName(field));
-    code += "Vector(builder, numElems): return builder.StartVector(";
-    auto vector_type = field.value.type.VectorType();
-    auto alignment = InlineAlignment(vector_type);
-    auto elem_size = InlineSize(vector_type);
-    code += NumToString(elem_size);
-    code += ", numElems, " + NumToString(alignment);
-    code += ")\n";
-
-    // Add alias with the old name.
-    code += "def " + NormalizedName(struct_def) + "Start";
-    code += MakeCamel(NormalizedName(field));
-    code += "Vector(builder, numElems):\n";
-    code += Indent + "\"\"\"This method is deprecated. Please switch to Start.\"\"\"\n";
-    code += Indent + "return Start";
-    code += MakeCamel(NormalizedName(field));
-    code += "Vector(builder, numElems)\n";
-  }
-
-  // Set the value of one of the members of a table's vector and fills in the
-  // elements from a bytearray. This is for simplifying the use of nested
-  // flatbuffers.
-  void BuildVectorOfTableFromBytes(const FieldDef &field, std::string *code_ptr) {
-    auto nested = field.attributes.Lookup("nested_flatbuffer");
-    if (!nested) { return; }  // There is no nested flatbuffer.
-
-    std::string unqualified_name = nested->constant;
-    std::string qualified_name = nested->constant;
-    auto nested_root = parser_.LookupStruct(nested->constant);
-    if (nested_root == nullptr) {
-      qualified_name =
-          parser_.current_namespace_->GetFullyQualifiedName(nested->constant);
-      nested_root = parser_.LookupStruct(qualified_name);
-    }
-    FLATBUFFERS_ASSERT(nested_root);  // Guaranteed to exist by parser.
-    (void)nested_root;
-
-    auto &code = *code_ptr;
-    code += "def MakeVectorFromBytes(builder, bytes):\n";
-    code += Indent + "builder.StartVector(";
-    auto vector_type = field.value.type.VectorType();
-    auto alignment = InlineAlignment(vector_type);
-    auto elem_size = InlineSize(vector_type);
-    code += NumToString(elem_size);
-    code += ", len(bytes), " + NumToString(alignment);
-    code += ")\n";
-    code += Indent + "builder.head = builder.head - len(bytes)\n";
-    code += Indent + "builder.Bytes[builder.head : builder.head + len(bytes)]";
-    code += " = bytes\n";
-    code += Indent + "return builder.EndVector()\n";
-
-    // Add alias with the old name.
-    code += "def Make" + MakeCamel(NormalizedName(field));
-    code += "VectorFromBytes(builder, bytes):\n";
-    code += Indent + "builder.StartVector(";
-    code += NumToString(elem_size);
-    code += ", len(bytes), " + NumToString(alignment);
-    code += ")\n";
-    code += Indent + "builder.head = builder.head - len(bytes)\n";
-    code += Indent + "builder.Bytes[builder.head : builder.head + len(bytes)]";
-    code += " = bytes\n";
-    code += Indent + "return builder.EndVector()\n";
-  }
-
-  // Get the offset of the end of a table.
-  void GetEndOffsetOnTable(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "def End(builder): return builder.EndObject()\n";
-
-    // Add alias with the old name.
-    code += "def " + NormalizedName(struct_def) + "End(builder):\n";
-    code += Indent + "\"\"\"This method is deprecated. Please switch to End.\"\"\"\n";
-    code += Indent + "return End(builder)";
-  }
-
-  // Generate the receiver for function signatures.
-  void GenReceiver(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += Indent + "# " + NormalizedName(struct_def) + "\n";
-    code += Indent + "def ";
-  }
-
-  // Generate a struct field, conditioned on its child type(s).
-  void GenStructAccessor(const StructDef &struct_def, const FieldDef &field,
-                         std::string *code_ptr) {
-    GenComment(field.doc_comment, code_ptr, &def_comment, Indent.c_str());
-    if (IsScalar(field.value.type.base_type)) {
-      if (struct_def.fixed) {
-        GetScalarFieldOfStruct(struct_def, field, code_ptr);
-      } else {
-        GetScalarFieldOfTable(struct_def, field, code_ptr);
-      }
-    } else if (IsArray(field.value.type)) {
-      GetArrayOfStruct(struct_def, field, code_ptr);
-    } else {
-      switch (field.value.type.base_type) {
-        case BASE_TYPE_STRUCT:
-          if (struct_def.fixed) {
-            GetStructFieldOfStruct(struct_def, field, code_ptr);
-          } else {
-            GetStructFieldOfTable(struct_def, field, code_ptr);
-          }
-          break;
-        case BASE_TYPE_STRING:
-          GetStringField(struct_def, field, code_ptr);
-          break;
-        case BASE_TYPE_VECTOR: {
-          auto vectortype = field.value.type.VectorType();
-          if (vectortype.base_type == BASE_TYPE_STRUCT) {
-            GetMemberOfVectorOfStruct(struct_def, field, code_ptr);
-          } else {
-            GetMemberOfVectorOfNonStruct(struct_def, field, code_ptr);
-            GetVectorOfNonStructAsNumpy(struct_def, field, code_ptr);
-            GetVectorAsNestedFlatbuffer(struct_def, field, code_ptr);
-          }
-          break;
-        }
-        case BASE_TYPE_UNION: GetUnionField(struct_def, field, code_ptr); break;
-        default: FLATBUFFERS_ASSERT(0);
-      }
-    }
-    if (IsVector(field.value.type) || IsArray(field.value.type)) {
-      GetVectorLen(struct_def, field, code_ptr);
-      GetVectorIsNone(struct_def, field, code_ptr);
-    }
-  }
-
-  // Generate struct sizeof.
-  void GenStructSizeOf(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += Indent + "@classmethod\n";
-    code += Indent + "def SizeOf(cls):\n";
-    code +=
-        Indent + Indent + "return " + NumToString(struct_def.bytesize) + "\n";
-    code += "\n";
-  }
-
-  // Generate table constructors, conditioned on its members' types.
-  void GenTableBuilders(const StructDef &struct_def, std::string *code_ptr) {
-    GetStartOfTable(struct_def, code_ptr);
-
-    for (auto it = struct_def.fields.vec.begin();
-         it != struct_def.fields.vec.end(); ++it) {
-      auto &field = **it;
-      if (field.deprecated) continue;
-
-      auto offset = it - struct_def.fields.vec.begin();
-      BuildFieldOfTable(struct_def, field, offset, code_ptr);
-      if (IsVector(field.value.type)) {
-        BuildVectorOfTable(struct_def, field, code_ptr);
-        BuildVectorOfTableFromBytes(field, code_ptr);
-      }
-    }
-
-    GetEndOffsetOnTable(struct_def, code_ptr);
-  }
-
-  // Generate function to check for proper file identifier
-  void GenHasFileIdentifier(const StructDef &struct_def,
-                            std::string *code_ptr) {
-    auto &code = *code_ptr;
-    std::string escapedID;
-    // In the event any of file_identifier characters are special(NULL, \, etc),
-    // problems occur. To prevent this, convert all chars to their hex-escaped
-    // equivalent.
-    for (auto it = parser_.file_identifier_.begin();
-         it != parser_.file_identifier_.end(); ++it) {
-      escapedID += "\\x" + IntToStringHex(*it, 2);
-    }
-
-    code += Indent + "@classmethod\n";
-    code += Indent + "def " + NormalizedName(struct_def);
-    code += "BufferHasIdentifier(cls, buf, offset, size_prefixed=False):";
-    code += "\n";
-    code += Indent + Indent;
-    code += "return flatbuffers.util.BufferHasIdentifier(buf, offset, b\"";
-    code += escapedID;
-    code += "\", size_prefixed=size_prefixed)\n";
-    code += "\n";
-  }
-
-  // Generates struct or table methods.
-  void GenStruct(const StructDef &struct_def, std::string *code_ptr) {
-    if (struct_def.generated) return;
-
-    GenComment(struct_def.doc_comment, code_ptr, &def_comment);
-    BeginClass(struct_def, code_ptr);
-    if (!struct_def.fixed) {
-      // Generate a special accessor for the table that has been declared as
-      // the root type.
-      NewRootTypeFromBuffer(struct_def, code_ptr);
-      if (parser_.file_identifier_.length()) {
-        // Generate a special function to test file_identifier
-        GenHasFileIdentifier(struct_def, code_ptr);
-      }
-    } else {
-      // Generates the SizeOf method for all structs.
-      GenStructSizeOf(struct_def, code_ptr);
-    }
-    // Generates the Init method that sets the field in a pre-existing
-    // accessor object. This is to allow object reuse.
-    InitializeExisting(struct_def, code_ptr);
-    for (auto it = struct_def.fields.vec.begin();
-         it != struct_def.fields.vec.end(); ++it) {
-      auto &field = **it;
-      if (field.deprecated) continue;
-
-      GenStructAccessor(struct_def, field, code_ptr);
-    }
-
-    if (struct_def.fixed) {
-      // creates a struct constructor function
-      GenStructBuilder(struct_def, code_ptr);
-    } else {
-      // Creates a set of functions that allow table construction.
-      GenTableBuilders(struct_def, code_ptr);
-    }
-  }
-
-  void GenReceiverForObjectAPI(const StructDef &struct_def,
-                               std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += GenIndents(1) + "# " + NormalizedName(struct_def) + "T";
-    code += GenIndents(1) + "def ";
-  }
-
-  void BeginClassForObjectAPI(const StructDef &struct_def,
-                              std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code += "\n";
-    code += "class " + NormalizedName(struct_def) + "T(object):";
-    code += "\n";
-  }
-
-  // Gets the accoresponding python builtin type of a BaseType for scalars and
-  // string.
-  std::string GetBasePythonTypeForScalarAndString(const BaseType &base_type) {
-    if (IsBool(base_type)) {
-      return "bool";
-    } else if (IsFloat(base_type)) {
-      return "float";
-    } else if (IsInteger(base_type)) {
-      return "int";
-    } else if (base_type == BASE_TYPE_STRING) {
-      return "str";
-    } else {
-      FLATBUFFERS_ASSERT(false && "base_type is not a scalar or string type.");
-      return "";
-    }
-  }
-
-  std::string GetDefaultValue(const FieldDef &field) {
-    BaseType base_type = field.value.type.base_type;
-    if (IsBool(base_type)) {
-      return field.value.constant == "0" ? "False" : "True";
-    } else if (IsFloat(base_type)) {
-      return float_const_gen_.GenFloatConstant(field);
-    } else if (IsInteger(base_type)) {
-      return field.value.constant;
-    } else {
-      // For string, struct, and table.
-      return "None";
-    }
-  }
-
-  void GenUnionInit(const FieldDef &field, std::string *field_types_ptr,
-                    std::set<std::string> *import_list,
-                    std::set<std::string> *import_typing_list) {
-    // Gets all possible types in the union.
-    import_typing_list->insert("Union");
-    auto &field_types = *field_types_ptr;
-    field_types = "Union[";
-
-    std::string separator_string = ", ";
-    auto enum_def = field.value.type.enum_def;
-    for (auto it = enum_def->Vals().begin(); it != enum_def->Vals().end();
-         ++it) {
-      auto &ev = **it;
-      // Union only supports string and table.
-      std::string field_type;
-      switch (ev.union_type.base_type) {
-        case BASE_TYPE_STRUCT:
-          field_type = GenTypeGet(ev.union_type) + "T";
-          if (parser_.opts.include_dependence_headers) {
-            auto package_reference = GenPackageReference(ev.union_type);
-            field_type = package_reference + "." + field_type;
-            import_list->insert("import " + package_reference);
-          }
-          break;
-        case BASE_TYPE_STRING: field_type += "str"; break;
-        case BASE_TYPE_NONE: field_type += "None"; break;
-        default: break;
-      }
-      field_types += field_type + separator_string;
-    }
-
-    // Removes the last separator_string.
-    field_types.erase(field_types.length() - separator_string.size());
-    field_types += "]";
-
-    // Gets the import lists for the union.
-    if (parser_.opts.include_dependence_headers) {
-      // The package reference is generated based on enum_def, instead
-      // of struct_def in field.type. That's why GenPackageReference() is
-      // not used.
-      Namespace *namespaces = field.value.type.enum_def->defined_namespace;
-      auto package_reference = namespaces->GetFullyQualifiedName(
-          MakeUpperCamel(*(field.value.type.enum_def)));
-      auto union_name = MakeUpperCamel(*(field.value.type.enum_def));
-      import_list->insert("import " + package_reference);
-    }
-  }
-
-  void GenStructInit(const FieldDef &field, std::string *field_type_ptr,
-                     std::set<std::string> *import_list,
-                     std::set<std::string> *import_typing_list) {
-    import_typing_list->insert("Optional");
-    auto &field_type = *field_type_ptr;
-    if (parser_.opts.include_dependence_headers) {
-      auto package_reference = GenPackageReference(field.value.type);
-      field_type = package_reference + "." + TypeName(field) + "T]";
-      import_list->insert("import " + package_reference);
-    } else {
-      field_type = TypeName(field) + "T]";
-    }
-    field_type = "Optional[" + field_type;
-  }
-
-  void GenVectorInit(const FieldDef &field, std::string *field_type_ptr,
-                     std::set<std::string> *import_list,
-                     std::set<std::string> *import_typing_list) {
-    import_typing_list->insert("List");
-    auto &field_type = *field_type_ptr;
-    auto base_type = field.value.type.VectorType().base_type;
-    if (base_type == BASE_TYPE_STRUCT) {
-      field_type = GenTypeGet(field.value.type.VectorType()) + "T]";
-      if (parser_.opts.include_dependence_headers) {
-        auto package_reference =
-            GenPackageReference(field.value.type.VectorType());
-        field_type = package_reference + "." +
-                     GenTypeGet(field.value.type.VectorType()) + "T]";
-        import_list->insert("import " + package_reference);
-      }
-      field_type = "List[" + field_type;
-    } else {
-      field_type =
-          "List[" + GetBasePythonTypeForScalarAndString(base_type) + "]";
-    }
-  }
-
-  void GenInitialize(const StructDef &struct_def, std::string *code_ptr,
-                     std::set<std::string> *import_list) {
-    std::string code;
-    std::set<std::string> import_typing_list;
-    for (auto it = struct_def.fields.vec.begin();
-         it != struct_def.fields.vec.end(); ++it) {
-      auto &field = **it;
-      if (field.deprecated) continue;
-
-      // Determines field type, default value, and typing imports.
-      auto base_type = field.value.type.base_type;
-      std::string field_type;
-      switch (base_type) {
-        case BASE_TYPE_UNION: {
-          GenUnionInit(field, &field_type, import_list, &import_typing_list);
-          break;
-        }
-        case BASE_TYPE_STRUCT: {
-          GenStructInit(field, &field_type, import_list, &import_typing_list);
-          break;
-        }
-        case BASE_TYPE_VECTOR:
-        case BASE_TYPE_ARRAY: {
-          GenVectorInit(field, &field_type, import_list, &import_typing_list);
-          break;
-        }
-        default:
-          // Scalar or sting fields.
-          field_type = GetBasePythonTypeForScalarAndString(base_type);
-          break;
-      }
-
-      auto default_value = GetDefaultValue(field);
-      // Wrties the init statement.
-      auto field_instance_name = MakeLowerCamel(field);
-      code += GenIndents(2) + "self." + field_instance_name + " = " +
-              default_value + "  # type: " + field_type;
-    }
-
-    // Writes __init__ method.
-    auto &code_base = *code_ptr;
-    GenReceiverForObjectAPI(struct_def, code_ptr);
-    code_base += "__init__(self):";
-    if (code.empty()) {
-      code_base += GenIndents(2) + "pass";
-    } else {
-      code_base += code;
-    }
-    code_base += "\n";
-
-    // Merges the typing imports into import_list.
-    if (!import_typing_list.empty()) {
-      // Adds the try statement.
-      std::string typing_imports = "try:";
-      typing_imports += GenIndents(1) + "from typing import ";
-      std::string separator_string = ", ";
-      for (auto it = import_typing_list.begin(); it != import_typing_list.end();
-           ++it) {
-        const std::string &im = *it;
-        typing_imports += im + separator_string;
-      }
-      // Removes the last separator_string.
-      typing_imports.erase(typing_imports.length() - separator_string.size());
-
-      // Adds the except statement.
-      typing_imports += "\n";
-      typing_imports += "except:";
-      typing_imports += GenIndents(1) + "pass";
-      import_list->insert(typing_imports);
-    }
-
-    // Removes the import of the struct itself, if applied.
-    auto package_reference =
-        struct_def.defined_namespace->GetFullyQualifiedName(
-            MakeUpperCamel(struct_def));
-    auto struct_import = "import " + package_reference;
-    import_list->erase(struct_import);
-  }
-
-  void InitializeFromBuf(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto instance_name = MakeLowerCamel(struct_def);
-    auto struct_name = NormalizedName(struct_def);
-
-    code += GenIndents(1) + "@classmethod";
-    code += GenIndents(1) + "def InitFromBuf(cls, buf, pos):";
-    code += GenIndents(2) + instance_name + " = " + struct_name + "()";
-    code += GenIndents(2) + instance_name + ".Init(buf, pos)";
-    code += GenIndents(2) + "return cls.InitFromObj(" + instance_name + ")";
-    code += "\n";
-  }
-
-  void InitializeFromObjForObject(const StructDef &struct_def,
-                                  std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto instance_name = MakeLowerCamel(struct_def);
-    auto struct_name = NormalizedName(struct_def);
-
-    code += GenIndents(1) + "@classmethod";
-    code += GenIndents(1) + "def InitFromObj(cls, " + instance_name + "):";
-    code += GenIndents(2) + "x = " + struct_name + "T()";
-    code += GenIndents(2) + "x._UnPack(" + instance_name + ")";
-    code += GenIndents(2) + "return x";
-    code += "\n";
-  }
-
-  void GenUnPackForStruct(const StructDef &struct_def, const FieldDef &field,
-                          std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto struct_instance_name = MakeLowerCamel(struct_def);
-    auto field_instance_name = MakeLowerCamel(field);
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto field_type = TypeName(field);
-
-    if (parser_.opts.include_dependence_headers) {
-      auto package_reference = GenPackageReference(field.value.type);
-      field_type = package_reference + "." + TypeName(field);
-    }
-
-    code += GenIndents(2) + "if " + struct_instance_name + "." +
-            field_accessor_name + "(";
-    // if field is a struct, we need to create an instance for it first.
-    if (struct_def.fixed && field.value.type.base_type == BASE_TYPE_STRUCT) {
-      code += field_type + "()";
-    }
-    code += ") is not None:";
-    code += GenIndents(3) + "self." + field_instance_name + " = " + field_type +
-            "T.InitFromObj(" + struct_instance_name + "." +
-            field_accessor_name + "(";
-    // A struct's accessor requires a struct buf instance.
-    if (struct_def.fixed && field.value.type.base_type == BASE_TYPE_STRUCT) {
-      code += field_type + "()";
-    }
-    code += "))";
-  }
-
-  void GenUnPackForUnion(const StructDef &struct_def, const FieldDef &field,
-                         std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_instance_name = MakeLowerCamel(struct_def);
-    auto union_name = MakeUpperCamel(*(field.value.type.enum_def));
-
-    if (parser_.opts.include_dependence_headers) {
-      Namespace *namespaces = field.value.type.enum_def->defined_namespace;
-      auto package_reference = namespaces->GetFullyQualifiedName(
-          MakeUpperCamel(*(field.value.type.enum_def)));
-      union_name = package_reference + "." + union_name;
-    }
-    code += GenIndents(2) + "self." + field_instance_name + " = " + union_name +
-            "Creator(" + "self." + field_instance_name + "Type, " +
-            struct_instance_name + "." + field_accessor_name + "())";
-  }
-
-  void GenUnPackForStructVector(const StructDef &struct_def,
-                                const FieldDef &field, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_instance_name = MakeLowerCamel(struct_def);
-
-    code += GenIndents(2) + "if not " + struct_instance_name + "." +
-            field_accessor_name + "IsNone():";
-    code += GenIndents(3) + "self." + field_instance_name + " = []";
-    code += GenIndents(3) + "for i in range(" + struct_instance_name + "." +
-            field_accessor_name + "Length()):";
-
-    auto field_type_name = TypeName(field);
-    auto one_instance = field_type_name + "_";
-    one_instance[0] = CharToLower(one_instance[0]);
-
-    if (parser_.opts.include_dependence_headers) {
-      auto package_reference = GenPackageReference(field.value.type);
-      field_type_name = package_reference + "." + TypeName(field);
-    }
-
-    code += GenIndents(4) + "if " + struct_instance_name + "." +
-            field_accessor_name + "(i) is None:";
-    code += GenIndents(5) + "self." + field_instance_name + ".append(None)";
-    code += GenIndents(4) + "else:";
-    code += GenIndents(5) + one_instance + " = " + field_type_name +
-            "T.InitFromObj(" + struct_instance_name + "." +
-            field_accessor_name + "(i))";
-    code += GenIndents(5) + "self." + field_instance_name + ".append(" +
-            one_instance + ")";
-  }
-
-  void GenUnpackforScalarVectorHelper(const StructDef &struct_def,
-                                      const FieldDef &field,
-                                      std::string *code_ptr, int indents) {
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_instance_name = MakeLowerCamel(struct_def);
-
-    code += GenIndents(indents) + "self." + field_instance_name + " = []";
-    code += GenIndents(indents) + "for i in range(" + struct_instance_name +
-            "." + field_accessor_name + "Length()):";
-    code += GenIndents(indents + 1) + "self." + field_instance_name +
-            ".append(" + struct_instance_name + "." + field_accessor_name +
-            "(i))";
-  }
-
-  void GenUnPackForScalarVector(const StructDef &struct_def,
-                                const FieldDef &field, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_instance_name = MakeLowerCamel(struct_def);
-
-    code += GenIndents(2) + "if not " + struct_instance_name + "." +
-            field_accessor_name + "IsNone():";
-
-    // String does not have the AsNumpy method.
-    if (!(IsScalar(field.value.type.VectorType().base_type))) {
-      GenUnpackforScalarVectorHelper(struct_def, field, code_ptr, 3);
-      return;
-    }
-
-    code += GenIndents(3) + "if np is None:";
-    GenUnpackforScalarVectorHelper(struct_def, field, code_ptr, 4);
-
-    // If numpy exists, use the AsNumpy method to optimize the unpack speed.
-    code += GenIndents(3) + "else:";
-    code += GenIndents(4) + "self." + field_instance_name + " = " +
-            struct_instance_name + "." + field_accessor_name + "AsNumpy()";
-  }
-
-  void GenUnPackForScalar(const StructDef &struct_def, const FieldDef &field,
-                          std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_instance_name = MakeLowerCamel(struct_def);
-
-    code += GenIndents(2) + "self." + field_instance_name + " = " +
-            struct_instance_name + "." + field_accessor_name + "()";
-  }
-
-  // Generates the UnPack method for the object class.
-  void GenUnPack(const StructDef &struct_def, std::string *code_ptr) {
-    std::string code;
-    // Items that needs to be imported. No duplicate modules will be imported.
-    std::set<std::string> import_list;
-
-    for (auto it = struct_def.fields.vec.begin();
-         it != struct_def.fields.vec.end(); ++it) {
-      auto &field = **it;
-      if (field.deprecated) continue;
-
-      auto field_type = TypeName(field);
-      switch (field.value.type.base_type) {
-        case BASE_TYPE_STRUCT: {
-          GenUnPackForStruct(struct_def, field, &code);
-          break;
-        }
-        case BASE_TYPE_UNION: {
-          GenUnPackForUnion(struct_def, field, &code);
-          break;
-        }
-        case BASE_TYPE_VECTOR: {
-          auto vectortype = field.value.type.VectorType();
-          if (vectortype.base_type == BASE_TYPE_STRUCT) {
-            GenUnPackForStructVector(struct_def, field, &code);
-          } else {
-            GenUnPackForScalarVector(struct_def, field, &code);
-          }
-          break;
-        }
-        case BASE_TYPE_ARRAY: {
-          GenUnPackForScalarVector(struct_def, field, &code);
-          break;
-        }
-        default: GenUnPackForScalar(struct_def, field, &code);
-      }
-    }
-
-    // Writes import statements and code into the generated file.
-    auto &code_base = *code_ptr;
-    auto struct_instance_name = MakeLowerCamel(struct_def);
-    auto struct_name = MakeUpperCamel(struct_def);
-
-    GenReceiverForObjectAPI(struct_def, code_ptr);
-    code_base += "_UnPack(self, " + struct_instance_name + "):";
-    code_base += GenIndents(2) + "if " + struct_instance_name + " is None:";
-    code_base += GenIndents(3) + "return";
-
-    // Write the import statements.
-    for (std::set<std::string>::iterator it = import_list.begin();
-         it != import_list.end(); ++it) {
-      code_base += GenIndents(2) + *it;
-    }
-
-    // Write the code.
-    code_base += code;
-    code_base += "\n";
-  }
-
-  void GenPackForStruct(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto struct_name = MakeUpperCamel(struct_def);
-
-    GenReceiverForObjectAPI(struct_def, code_ptr);
-    code += "Pack(self, builder):";
-    code += GenIndents(2) + "return Create" + struct_name + "(builder";
-
-    StructBuilderArgs(struct_def,
-                      /* nameprefix = */ "self.",
-                      /* namesuffix = */ "",
-                      /* has_field_name = */ true,
-                      /* fieldname_suffix = */ ".", code_ptr);
-    code += ")\n";
-  }
-
-  void GenPackForStructVectorField(const StructDef &struct_def,
-                                   const FieldDef &field,
-                                   std::string *code_prefix_ptr,
-                                   std::string *code_ptr) {
-    auto &code_prefix = *code_prefix_ptr;
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-    auto struct_name = NormalizedName(struct_def);
-    auto field_accessor_name = MakeUpperCamel(field);
-
-    // Creates the field.
-    code_prefix +=
-        GenIndents(2) + "if self." + field_instance_name + " is not None:";
-    if (field.value.type.struct_def->fixed) {
-      code_prefix += GenIndents(3) + "Start" +
-                     field_accessor_name + "Vector(builder, len(self." +
-                     field_instance_name + "))";
-      code_prefix += GenIndents(3) + "for i in reversed(range(len(self." +
-                     field_instance_name + "))):";
-      code_prefix +=
-          GenIndents(4) + "self." + field_instance_name + "[i].Pack(builder)";
-      code_prefix +=
-          GenIndents(3) + field_instance_name + " = builder.EndVector()";
-    } else {
-      // If the vector is a struct vector, we need to first build accessor for
-      // each struct element.
-      code_prefix += GenIndents(3) + field_instance_name + "list = []";
-      code_prefix += GenIndents(3);
-      code_prefix += "for i in range(len(self." + field_instance_name + ")):";
-      code_prefix += GenIndents(4) + field_instance_name + "list.append(self." +
-                     field_instance_name + "[i].Pack(builder))";
-
-      code_prefix += GenIndents(3) + "Start" +
-                     field_accessor_name + "Vector(builder, len(self." +
-                     field_instance_name + "))";
-      code_prefix += GenIndents(3) + "for i in reversed(range(len(self." +
-                     field_instance_name + "))):";
-      code_prefix += GenIndents(4) + "builder.PrependUOffsetTRelative" + "(" +
-                     field_instance_name + "list[i])";
-      code_prefix +=
-          GenIndents(3) + field_instance_name + " = builder.EndVector()";
-    }
-
-    // Adds the field into the struct.
-    code += GenIndents(2) + "if self." + field_instance_name + " is not None:";
-    code += GenIndents(3) + "Add" + field_accessor_name +
-            "(builder, " + field_instance_name + ")";
-  }
-
-  void GenPackForScalarVectorFieldHelper(const StructDef &struct_def,
-                                         const FieldDef &field,
-                                         std::string *code_ptr, int indents) {
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_name = NormalizedName(struct_def);
-    auto vectortype = field.value.type.VectorType();
-
-    code += GenIndents(indents) + "Start" + field_accessor_name +
-            "Vector(builder, len(self." + field_instance_name + "))";
-    code += GenIndents(indents) + "for i in reversed(range(len(self." +
-            field_instance_name + "))):";
-    code += GenIndents(indents + 1) + "builder.Prepend";
-
-    std::string type_name;
-    switch (vectortype.base_type) {
-      case BASE_TYPE_BOOL: type_name = "Bool"; break;
-      case BASE_TYPE_CHAR: type_name = "Byte"; break;
-      case BASE_TYPE_UCHAR: type_name = "Uint8"; break;
-      case BASE_TYPE_SHORT: type_name = "Int16"; break;
-      case BASE_TYPE_USHORT: type_name = "Uint16"; break;
-      case BASE_TYPE_INT: type_name = "Int32"; break;
-      case BASE_TYPE_UINT: type_name = "Uint32"; break;
-      case BASE_TYPE_LONG: type_name = "Int64"; break;
-      case BASE_TYPE_ULONG: type_name = "Uint64"; break;
-      case BASE_TYPE_FLOAT: type_name = "Float32"; break;
-      case BASE_TYPE_DOUBLE: type_name = "Float64"; break;
-      case BASE_TYPE_STRING: type_name = "UOffsetTRelative"; break;
-      default: type_name = "VOffsetT"; break;
-    }
-    code += type_name;
-  }
-
-  void GenPackForScalarVectorField(const StructDef &struct_def,
-                                   const FieldDef &field,
-                                   std::string *code_prefix_ptr,
-                                   std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto &code_prefix = *code_prefix_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_name = NormalizedName(struct_def);
-
-    // Adds the field into the struct.
-    code += GenIndents(2) + "if self." + field_instance_name + " is not None:";
-    code += GenIndents(3) + "Add" + field_accessor_name +
-            "(builder, " + field_instance_name + ")";
-
-    // Creates the field.
-    code_prefix +=
-        GenIndents(2) + "if self." + field_instance_name + " is not None:";
-    // If the vector is a string vector, we need to first build accessor for
-    // each string element. And this generated code, needs to be
-    // placed ahead of code_prefix.
-    auto vectortype = field.value.type.VectorType();
-    if (IsString(vectortype)) {
-      code_prefix += GenIndents(3) + MakeLowerCamel(field) + "list = []";
-      code_prefix += GenIndents(3) + "for i in range(len(self." +
-                     field_instance_name + ")):";
-      code_prefix += GenIndents(4) + MakeLowerCamel(field) +
-                     "list.append(builder.CreateString(self." +
-                     field_instance_name + "[i]))";
-      GenPackForScalarVectorFieldHelper(struct_def, field, code_prefix_ptr, 3);
-      code_prefix += "(" + MakeLowerCamel(field) + "list[i])";
-      code_prefix +=
-          GenIndents(3) + field_instance_name + " = builder.EndVector()";
-      return;
-    }
-
-    code_prefix += GenIndents(3) + "if np is not None and type(self." +
-                   field_instance_name + ") is np.ndarray:";
-    code_prefix += GenIndents(4) + field_instance_name +
-                   " = builder.CreateNumpyVector(self." + field_instance_name +
-                   ")";
-    code_prefix += GenIndents(3) + "else:";
-    GenPackForScalarVectorFieldHelper(struct_def, field, code_prefix_ptr, 4);
-    code_prefix += "(self." + field_instance_name + "[i])";
-    code_prefix +=
-        GenIndents(4) + field_instance_name + " = builder.EndVector()";
-  }
-
-  void GenPackForStructField(const StructDef &struct_def, const FieldDef &field,
-                             std::string *code_prefix_ptr,
-                             std::string *code_ptr) {
-    auto &code_prefix = *code_prefix_ptr;
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_name = NormalizedName(struct_def);
-
-    if (field.value.type.struct_def->fixed) {
-      // Pure struct fields need to be created along with their parent
-      // structs.
-      code +=
-          GenIndents(2) + "if self." + field_instance_name + " is not None:";
-      code += GenIndents(3) + field_instance_name + " = self." +
-              field_instance_name + ".Pack(builder)";
-    } else {
-      // Tables need to be created before their parent structs are created.
-      code_prefix +=
-          GenIndents(2) + "if self." + field_instance_name + " is not None:";
-      code_prefix += GenIndents(3) + field_instance_name + " = self." +
-                     field_instance_name + ".Pack(builder)";
-      code +=
-          GenIndents(2) + "if self." + field_instance_name + " is not None:";
-    }
-
-    code += GenIndents(3) + "Add" + field_accessor_name +
-            "(builder, " + field_instance_name + ")";
-  }
-
-  void GenPackForUnionField(const StructDef &struct_def, const FieldDef &field,
-                            std::string *code_prefix_ptr,
-                            std::string *code_ptr) {
-    auto &code_prefix = *code_prefix_ptr;
-    auto &code = *code_ptr;
-    auto field_instance_name = MakeLowerCamel(field);
-
-    auto field_accessor_name = MakeUpperCamel(field);
-    auto struct_name = NormalizedName(struct_def);
-
-    // TODO(luwa): TypeT should be moved under the None check as well.
-    code_prefix +=
-        GenIndents(2) + "if self." + field_instance_name + " is not None:";
-    code_prefix += GenIndents(3) + field_instance_name + " = self." +
-                   field_instance_name + ".Pack(builder)";
-    code += GenIndents(2) + "if self." + field_instance_name + " is not None:";
-    code += GenIndents(3) + "Add" + field_accessor_name +
-            "(builder, " + field_instance_name + ")";
-  }
-
-  void GenPackForTable(const StructDef &struct_def, std::string *code_ptr) {
-    auto &code_base = *code_ptr;
-    std::string code, code_prefix;
-    auto struct_instance_name = MakeLowerCamel(struct_def);
-    auto struct_name = NormalizedName(struct_def);
-
-    GenReceiverForObjectAPI(struct_def, code_ptr);
-    code_base += "Pack(self, builder):";
-    code += GenIndents(2) + "Start(builder)";
-    for (auto it = struct_def.fields.vec.begin();
-         it != struct_def.fields.vec.end(); ++it) {
-      auto &field = **it;
-      if (field.deprecated) continue;
-
-      auto field_accessor_name = MakeUpperCamel(field);
-      auto field_instance_name = MakeLowerCamel(field);
-
-      switch (field.value.type.base_type) {
-        case BASE_TYPE_STRUCT: {
-          GenPackForStructField(struct_def, field, &code_prefix, &code);
-          break;
-        }
-        case BASE_TYPE_UNION: {
-          GenPackForUnionField(struct_def, field, &code_prefix, &code);
-          break;
-        }
-        case BASE_TYPE_VECTOR: {
-          auto vectortype = field.value.type.VectorType();
-          if (vectortype.base_type == BASE_TYPE_STRUCT) {
-            GenPackForStructVectorField(struct_def, field, &code_prefix, &code);
-          } else {
-            GenPackForScalarVectorField(struct_def, field, &code_prefix, &code);
-          }
-          break;
-        }
-        case BASE_TYPE_ARRAY: {
-          GenPackForScalarVectorField(struct_def, field, &code_prefix, &code);
-          break;
-        }
-        case BASE_TYPE_STRING: {
-          code_prefix += GenIndents(2) + "if self." + field_instance_name +
-                         " is not None:";
-          code_prefix += GenIndents(3) + field_instance_name +
-                         " = builder.CreateString(self." + field_instance_name +
-                         ")";
-          code += GenIndents(2) + "if self." + field_instance_name +
-                  " is not None:";
-          code += GenIndents(3) + "Add" + field_accessor_name +
-                  "(builder, " + field_instance_name + ")";
-          break;
-        }
-        default:
-          // Generates code for scalar values. If the value equals to the
-          // default value, builder will automatically ignore it. So we don't
-          // need to check the value ahead.
-          code += GenIndents(2) + "Add" + field_accessor_name +
-                  "(builder, self." + field_instance_name + ")";
-          break;
-      }
-    }
-
-    code += GenIndents(2) + struct_instance_name + " = " + "End(builder)";
-    code += GenIndents(2) + "return " + struct_instance_name;
-
-    code_base += code_prefix + code;
-    code_base += "\n";
-  }
-
-  void GenStructForObjectAPI(const StructDef &struct_def,
-                             std::string *code_ptr) {
-    if (struct_def.generated) return;
-
-    std::set<std::string> import_list;
-    std::string code;
-
-    // Creates an object class for a struct or a table
-    BeginClassForObjectAPI(struct_def, &code);
-
-    GenInitialize(struct_def, &code, &import_list);
-
-    InitializeFromBuf(struct_def, &code);
-
-    InitializeFromObjForObject(struct_def, &code);
-
-    GenUnPack(struct_def, &code);
-
-    if (struct_def.fixed) {
-      GenPackForStruct(struct_def, &code);
-    } else {
-      GenPackForTable(struct_def, &code);
-    }
-
-    // Adds the imports at top.
-    auto &code_base = *code_ptr;
-    code_base += "\n";
-    for (auto it = import_list.begin(); it != import_list.end(); it++) {
-      auto im = *it;
-      code_base += im + "\n";
-    }
-    code_base += code;
-  }
-
-  void GenUnionCreatorForStruct(const EnumDef &enum_def, const EnumVal &ev,
-                                std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto union_name = NormalizedName(enum_def);
-    auto field_name = NormalizedName(ev);
-    auto field_type = GenTypeGet(ev.union_type) + "T";
-
-    code += GenIndents(1) + "if unionType == " + union_name + "()." +
-            field_name + ":";
-    if (parser_.opts.include_dependence_headers) {
-      auto package_reference = GenPackageReference(ev.union_type);
-      code += GenIndents(2) + "import " + package_reference;
-      field_type = package_reference + "." + field_type;
-    }
-    code += GenIndents(2) + "return " + field_type +
-            ".InitFromBuf(table.Bytes, table.Pos)";
-  }
-
-  void GenUnionCreatorForString(const EnumDef &enum_def, const EnumVal &ev,
-                                std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto union_name = NormalizedName(enum_def);
-    auto field_name = NormalizedName(ev);
-
-    code += GenIndents(1) + "if unionType == " + union_name + "()." +
-            field_name + ":";
-    code += GenIndents(2) + "tab = Table(table.Bytes, table.Pos)";
-    code += GenIndents(2) + "union = tab.String(table.Pos)";
-    code += GenIndents(2) + "return union";
-  }
-
-  // Creates an union object based on union type.
-  void GenUnionCreator(const EnumDef &enum_def, std::string *code_ptr) {
-    auto &code = *code_ptr;
-    auto union_name = MakeUpperCamel(enum_def);
-
-    code += "\n";
-    code += "def " + union_name + "Creator(unionType, table):";
-    code += GenIndents(1) + "from flatbuffers.table import Table";
-    code += GenIndents(1) + "if not isinstance(table, Table):";
-    code += GenIndents(2) + "return None";
-
-    for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
-      auto &ev = **it;
-      // Union only supports string and table.
-      switch (ev.union_type.base_type) {
-        case BASE_TYPE_STRUCT:
-          GenUnionCreatorForStruct(enum_def, ev, &code);
-          break;
-        case BASE_TYPE_STRING:
-          GenUnionCreatorForString(enum_def, ev, &code);
-          break;
-        default: break;
-      }
-    }
-    code += GenIndents(1) + "return None";
-    code += "\n";
-  }
-
-  // Generate enum declarations.
-  void GenEnum(const EnumDef &enum_def, std::string *code_ptr) {
-    if (enum_def.generated) return;
-
-    GenComment(enum_def.doc_comment, code_ptr, &def_comment);
-    BeginEnum(NormalizedName(enum_def), code_ptr);
-    for (auto it = enum_def.Vals().begin(); it != enum_def.Vals().end(); ++it) {
-      auto &ev = **it;
-      GenComment(ev.doc_comment, code_ptr, &def_comment, Indent.c_str());
-      EnumMember(enum_def, ev, code_ptr);
-    }
-    EndEnum(code_ptr);
-  }
-
-  // Returns the function name that is able to read a value of the given type.
-  std::string GenGetter(const Type &type) {
-    switch (type.base_type) {
-      case BASE_TYPE_STRING: return "self._tab.String(";
-      case BASE_TYPE_UNION: return "self._tab.Union(";
-      case BASE_TYPE_VECTOR: return GenGetter(type.VectorType());
-      default:
-        return "self._tab.Get(flatbuffers.number_types." +
-               MakeCamel(GenTypeGet(type)) + "Flags, ";
-    }
-  }
-
-  // Returns the method name for use with add/put calls.
-  std::string GenMethod(const FieldDef &field) {
-    return (IsScalar(field.value.type.base_type) || IsArray(field.value.type))
-               ? MakeCamel(GenTypeBasic(field.value.type))
-               : (IsStruct(field.value.type) ? "Struct" : "UOffsetTRelative");
-  }
-
-  std::string GenTypeBasic(const Type &type) {
-    // clang-format off
-    static const char *ctypename[] = {
-      #define FLATBUFFERS_TD(ENUM, IDLTYPE, \
-              CTYPE, JTYPE, GTYPE, NTYPE, PTYPE, ...) \
-        #PTYPE,
-        FLATBUFFERS_GEN_TYPES(FLATBUFFERS_TD)
-      #undef FLATBUFFERS_TD
-    };
-    // clang-format on
-    return ctypename[IsArray(type) ? type.VectorType().base_type
-                                   : type.base_type];
-  }
-
-  std::string GenTypePointer(const Type &type) {
-    switch (type.base_type) {
-      case BASE_TYPE_STRING: return "string";
-      case BASE_TYPE_VECTOR: return GenTypeGet(type.VectorType());
-      case BASE_TYPE_STRUCT: return type.struct_def->name;
-      case BASE_TYPE_UNION:
-        // fall through
-      default: return "*flatbuffers.Table";
-    }
-  }
-
-  std::string GenTypeGet(const Type &type) {
-    return IsScalar(type.base_type) ? GenTypeBasic(type) : GenTypePointer(type);
-  }
-
-  std::string TypeName(const FieldDef &field) {
-    return GenTypeGet(field.value.type);
-  }
-
-  // Create a struct with a builder and the struct's arguments.
-  void GenStructBuilder(const StructDef &struct_def, std::string *code_ptr) {
-    BeginBuilderArgs(struct_def, code_ptr);
-    StructBuilderArgs(struct_def,
-                      /* nameprefix = */ "",
-                      /* namesuffix = */ "",
-                      /* has_field_name = */ true,
-                      /* fieldname_suffix = */ "_", code_ptr);
-    EndBuilderArgs(code_ptr);
-
-    StructBuilderBody(struct_def, "", code_ptr);
-    EndBuilderBody(code_ptr);
-  }
-
-  bool generate() {
-    if (!generateEnums()) return false;
-    if (!generateStructs()) return false;
-    return true;
-  }
-
- private:
-  bool generateEnums() {
-    for (auto it = parser_.enums_.vec.begin(); it != parser_.enums_.vec.end();
-         ++it) {
-      auto &enum_def = **it;
-      std::string enumcode;
-      GenEnum(enum_def, &enumcode);
-      if (parser_.opts.generate_object_based_api & enum_def.is_union) {
-        GenUnionCreator(enum_def, &enumcode);
-      }
-      if (!SaveType(enum_def, enumcode, false)) return false;
-    }
-    return true;
-  }
-
-  bool generateStructs() {
-    for (auto it = parser_.structs_.vec.begin();
-         it != parser_.structs_.vec.end(); ++it) {
-      auto &struct_def = **it;
-      std::string declcode;
-      GenStruct(struct_def, &declcode);
-      if (parser_.opts.generate_object_based_api) {
-        GenStructForObjectAPI(struct_def, &declcode);
-      }
-      if (!SaveType(struct_def, declcode, true)) return false;
-    }
-    return true;
-  }
-
-  // Begin by declaring namespace and imports.
-  void BeginFile(const std::string &name_space_name, const bool needs_imports,
-                 std::string *code_ptr) {
-    auto &code = *code_ptr;
-    code = code + "# " + FlatBuffersGeneratedWarning() + "\n\n";
-    code += "# namespace: " + name_space_name + "\n\n";
-    if (needs_imports) {
-      code += "import flatbuffers\n";
-      code += "from flatbuffers.compat import import_numpy\n";
-      code += "np = import_numpy()\n\n";
-    }
-  }
-
-  // Save out the generated code for a Python Table type.
-  bool SaveType(const Definition &def, const std::string &classcode,
-                bool needs_imports) {
-    if (!classcode.length()) return true;
-
-    std::string namespace_dir = path_;
-    auto &namespaces = def.defined_namespace->components;
-    for (auto it = namespaces.begin(); it != namespaces.end(); ++it) {
-      if (it != namespaces.begin()) namespace_dir += kPathSeparator;
-      namespace_dir += *it;
-      std::string init_py_filename = namespace_dir + "/__init__.py";
-      SaveFile(init_py_filename.c_str(), "", false);
-    }
-
-    std::string code = "";
-    BeginFile(LastNamespacePart(*def.defined_namespace), needs_imports, &code);
-    code += classcode;
-    std::string filename =
-        NamespaceDir(*def.defined_namespace) + NormalizedName(def) + ".py";
-    return SaveFile(filename.c_str(), code, false);
-  }
-
- private:
-  std::unordered_set<std::string> keywords_;
-  const SimpleFloatConstantGenerator float_const_gen_;
-};
-
-}  // namespace python
-
-bool GeneratePython(const Parser &parser, const std::string &path,
-                    const std::string &file_name) {
-  python::PythonGenerator generator(parser, path, file_name);
-  return generator.generate();
-}
-
-}  // namespace flatbuffers