fix ya.make

1 files changed, 0 insertions, 1290 deletions

diff --git a/contrib/python/ipython/py2/IPython/core/display.py b/contrib/python/ipython/py2/IPython/core/display.py
deleted file mode 100644
index 5c82a57b313..00000000000
--- a/contrib/python/ipython/py2/IPython/core/display.py
+++ /dev/null
@@ -1,1290 +0,0 @@
-# -*- coding: utf-8 -*-
-"""Top-level display functions for displaying object in different formats."""
-
-# Copyright (c) IPython Development Team.
-# Distributed under the terms of the Modified BSD License.
-
-from __future__ import print_function
-
-try:
-    from base64 import encodebytes as base64_encode
-except ImportError:
-    from base64 import encodestring as base64_encode
-
-from binascii import b2a_hex, hexlify
-import json
-import mimetypes
-import os
-import struct
-import sys
-import warnings
-
-from IPython.utils.py3compat import (string_types, cast_bytes_py2, cast_unicode,
-                                     unicode_type)
-from IPython.testing.skipdoctest import skip_doctest
-
-__all__ = ['display', 'display_pretty', 'display_html', 'display_markdown',
-'display_svg', 'display_png', 'display_jpeg', 'display_latex', 'display_json',
-'display_javascript', 'display_pdf', 'DisplayObject', 'TextDisplayObject',
-'Pretty', 'HTML', 'Markdown', 'Math', 'Latex', 'SVG', 'ProgressBar', 'JSON', 'Javascript',
-'Image', 'clear_output', 'set_matplotlib_formats', 'set_matplotlib_close',
-'publish_display_data', 'update_display', 'DisplayHandle']
-
-#-----------------------------------------------------------------------------
-# utility functions
-#-----------------------------------------------------------------------------
-
-def _safe_exists(path):
-    """Check path, but don't let exceptions raise"""
-    try:
-        return os.path.exists(path)
-    except Exception:
-        return False
-
-def _merge(d1, d2):
-    """Like update, but merges sub-dicts instead of clobbering at the top level.
-
-    Updates d1 in-place
-    """
-
-    if not isinstance(d2, dict) or not isinstance(d1, dict):
-        return d2
-    for key, value in d2.items():
-        d1[key] = _merge(d1.get(key), value)
-    return d1
-
-def _display_mimetype(mimetype, objs, raw=False, metadata=None):
-    """internal implementation of all display_foo methods
-
-    Parameters
-    ----------
-    mimetype : str
-        The mimetype to be published (e.g. 'image/png')
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw text data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    if metadata:
-        metadata = {mimetype: metadata}
-    if raw:
-        # turn list of pngdata into list of { 'image/png': pngdata }
-        objs = [ {mimetype: obj} for obj in objs ]
-    display(*objs, raw=raw, metadata=metadata, include=[mimetype])
-
-#-----------------------------------------------------------------------------
-# Main functions
-#-----------------------------------------------------------------------------
-# use * to indicate transient is keyword-only
-def publish_display_data(data, metadata=None, source=None, **kwargs):
-    """Publish data and metadata to all frontends.
-
-    See the ``display_data`` message in the messaging documentation for
-    more details about this message type.
-
-    The following MIME types are currently implemented:
-
-    * text/plain
-    * text/html
-    * text/markdown
-    * text/latex
-    * application/json
-    * application/javascript
-    * image/png
-    * image/jpeg
-    * image/svg+xml
-
-    Parameters
-    ----------
-    data : dict
-        A dictionary having keys that are valid MIME types (like
-        'text/plain' or 'image/svg+xml') and values that are the data for
-        that MIME type. The data itself must be a JSON'able data
-        structure. Minimally all data should have the 'text/plain' data,
-        which can be displayed by all frontends. If more than the plain
-        text is given, it is up to the frontend to decide which
-        representation to use.
-    metadata : dict
-        A dictionary for metadata related to the data. This can contain
-        arbitrary key, value pairs that frontends can use to interpret
-        the data. mime-type keys matching those in data can be used
-        to specify metadata about particular representations.
-    source : str, deprecated
-        Unused.
-    transient : dict, keyword-only
-        A dictionary of transient data, such as display_id.
-        """
-    from IPython.core.interactiveshell import InteractiveShell
-
-    display_pub = InteractiveShell.instance().display_pub
-
-    # only pass transient if supplied,
-    # to avoid errors with older ipykernel.
-    # TODO: We could check for ipykernel version and provide a detailed upgrade message.
-
-    display_pub.publish(
-        data=data,
-        metadata=metadata,
-        **kwargs
-    )
-
-
-def _new_id():
-    """Generate a new random text id with urandom"""
-    return b2a_hex(os.urandom(16)).decode('ascii')
-
-
-def display(*objs, **kwargs):
-    """Display a Python object in all frontends.
-
-    By default all representations will be computed and sent to the frontends.
-    Frontends can decide which representation is used and how.
-
-    In terminal IPython this will be similar to using :func:`print`, for use in richer
-    frontends see Jupyter notebook examples with rich display logic.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display.
-    raw : bool, optional
-        Are the objects to be displayed already mimetype-keyed dicts of raw display data,
-        or Python objects that need to be formatted before display? [default: False]
-    include : list, tuple or set, optional
-        A list of format type strings (MIME types) to include in the
-        format data dict. If this is set *only* the format types included
-        in this list will be computed.
-    exclude : list, tuple or set, optional
-        A list of format type strings (MIME types) to exclude in the format
-        data dict. If this is set all format types will be computed,
-        except for those included in this argument.
-    metadata : dict, optional
-        A dictionary of metadata to associate with the output.
-        mime-type keys in this dictionary will be associated with the individual
-        representation formats, if they exist.
-    transient : dict, optional
-        A dictionary of transient data to associate with the output.
-        Data in this dict should not be persisted to files (e.g. notebooks).
-    display_id : str, bool optional
-        Set an id for the display.
-        This id can be used for updating this display area later via update_display.
-        If given as `True`, generate a new `display_id`
-    kwargs: additional keyword-args, optional
-        Additional keyword-arguments are passed through to the display publisher.
-
-    Returns
-    -------
-
-    handle: DisplayHandle
-        Returns a handle on updatable displays for use with :func:`update_display`,
-        if `display_id` is given. Returns :any:`None` if no `display_id` is given
-        (default).
-
-    Examples
-    --------
-
-    >>> class Json(object):
-    ...     def __init__(self, json):
-    ...         self.json = json
-    ...     def _repr_pretty_(self, pp, cycle):
-    ...         import json
-    ...         pp.text(json.dumps(self.json, indent=2))
-    ...     def __repr__(self):
-    ...         return str(self.json)
-    ...
-
-    >>> d = Json({1:2, 3: {4:5}})
-
-    >>> print(d)
-    {1: 2, 3: {4: 5}}
-
-    >>> display(d)
-    {
-      "1": 2,
-      "3": {
-        "4": 5
-      }
-    }
-
-    >>> def int_formatter(integer, pp, cycle):
-    ...     pp.text('I'*integer)
-
-    >>> plain = get_ipython().display_formatter.formatters['text/plain']
-    >>> plain.for_type(int, int_formatter)
-    <function _repr_pprint at 0x...>
-    >>> display(7-5)
-    II
-
-    >>> del plain.type_printers[int]
-    >>> display(7-5)
-    2
-
-    See Also
-    --------
-
-    :func:`update_display`
-
-    Notes
-    -----
-
-    In Python, objects can declare their textual representation using the
-    `__repr__` method. IPython expands on this idea and allows objects to declare
-    other, rich representations including:
-
-      - HTML
-      - JSON
-      - PNG
-      - JPEG
-      - SVG
-      - LaTeX
-
-    A single object can declare some or all of these representations; all are
-    handled by IPython's display system.
-
-    The main idea of the first approach is that you have to implement special
-    display methods when you define your class, one for each representation you
-    want to use. Here is a list of the names of the special methods and the
-    values they must return:
-
-      - `_repr_html_`: return raw HTML as a string
-      - `_repr_json_`: return a JSONable dict
-      - `_repr_jpeg_`: return raw JPEG data
-      - `_repr_png_`: return raw PNG data
-      - `_repr_svg_`: return raw SVG data as a string
-      - `_repr_latex_`: return LaTeX commands in a string surrounded by "$".
-      - `_repr_mimebundle_`: return a full mimebundle containing the mapping
-      from all mimetypes to data
-
-    When you are directly writing your own classes, you can adapt them for
-    display in IPython by following the above approach. But in practice, you
-    often need to work with existing classes that you can't easily modify.
-
-    You can refer to the documentation on IPython display formatters in order to
-    register custom formatters for already existing types.
-
-    .. versionadded:: 5.4 display available without import
-    .. versionadded:: 6.1 display available without import
-
-    Since IPython 5.4 and 6.1 :func:`display` is automatically made available to
-    the user without import. If you are using display in a document that might
-    be used in a pure python context or with older version of IPython, use the
-    following import at the top of your file::
-
-        from IPython.display import display
-
-    """
-    from IPython.core.interactiveshell import InteractiveShell
-    
-    if not InteractiveShell.initialized():
-        # Directly print objects.
-        print(*objs)
-        return
-    
-    raw = kwargs.pop('raw', False)
-    include = kwargs.pop('include', None)
-    exclude = kwargs.pop('exclude', None)
-    metadata = kwargs.pop('metadata', None)
-    transient = kwargs.pop('transient', None)
-    display_id = kwargs.pop('display_id', None)
-    if transient is None:
-        transient = {}
-    if display_id:
-        if display_id is True:
-            display_id = _new_id()
-        transient['display_id'] = display_id
-    if kwargs.get('update') and 'display_id' not in transient:
-        raise TypeError('display_id required for update_display')
-    if transient:
-        kwargs['transient'] = transient
-
-    if not raw:
-        format = InteractiveShell.instance().display_formatter.format
-
-    for obj in objs:
-        if raw:
-            publish_display_data(data=obj, metadata=metadata, **kwargs)
-        else:
-            format_dict, md_dict = format(obj, include=include, exclude=exclude)
-            if not format_dict:
-                # nothing to display (e.g. _ipython_display_ took over)
-                continue
-            if metadata:
-                # kwarg-specified metadata gets precedence
-                _merge(md_dict, metadata)
-            publish_display_data(data=format_dict, metadata=md_dict, **kwargs)
-    if display_id:
-        return DisplayHandle(display_id)
-
-
-# use * for keyword-only display_id arg
-def update_display(obj, **kwargs):
-    """Update an existing display by id
-
-    Parameters
-    ----------
-
-    obj:
-        The object with which to update the display
-    display_id: keyword-only
-        The id of the display to update
-
-    See Also
-    --------
-
-    :func:`display`
-    """
-    sentinel = object()
-    display_id = kwargs.pop('display_id', sentinel)
-    if display_id is sentinel:
-        raise TypeError("update_display() missing 1 required keyword-only argument: 'display_id'")
-    kwargs['update'] = True
-    display(obj, display_id=display_id, **kwargs)
-
-
-class DisplayHandle(object):
-    """A handle on an updatable display
-
-    Call `.update(obj)` to display a new object.
-
-    Call `.display(obj`) to add a new instance of this display,
-    and update existing instances.
-
-    See Also
-    --------
-
-        :func:`display`, :func:`update_display`
-
-    """
-
-    def __init__(self, display_id=None):
-        if display_id is None:
-            display_id = _new_id()
-        self.display_id = display_id
-
-    def __repr__(self):
-        return "<%s display_id=%s>" % (self.__class__.__name__, self.display_id)
-
-    def display(self, obj, **kwargs):
-        """Make a new display with my id, updating existing instances.
-        
-        Parameters
-        ----------
-        
-        obj:
-            object to display
-        **kwargs:
-            additional keyword arguments passed to display
-        """
-        display(obj, display_id=self.display_id, **kwargs)
-
-    def update(self, obj, **kwargs):
-        """Update existing displays with my id
-        
-        Parameters
-        ----------
-        
-        obj:
-            object to display
-        **kwargs:
-            additional keyword arguments passed to update_display
-        """
-        update_display(obj, display_id=self.display_id, **kwargs)
-
-
-def display_pretty(*objs, **kwargs):
-    """Display the pretty (default) representation of an object.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw text data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('text/plain', objs, **kwargs)
-
-
-def display_html(*objs, **kwargs):
-    """Display the HTML representation of an object.
-    
-    Note: If raw=False and the object does not have a HTML
-    representation, no HTML will be shown.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw HTML data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('text/html', objs, **kwargs)
-
-
-def display_markdown(*objs, **kwargs):
-    """Displays the Markdown representation of an object.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw markdown data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-
-    _display_mimetype('text/markdown', objs, **kwargs)
-
-
-def display_svg(*objs, **kwargs):
-    """Display the SVG representation of an object.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw svg data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('image/svg+xml', objs, **kwargs)
-
-
-def display_png(*objs, **kwargs):
-    """Display the PNG representation of an object.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw png data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('image/png', objs, **kwargs)
-
-
-def display_jpeg(*objs, **kwargs):
-    """Display the JPEG representation of an object.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw JPEG data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('image/jpeg', objs, **kwargs)
-
-
-def display_latex(*objs, **kwargs):
-    """Display the LaTeX representation of an object.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw latex data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('text/latex', objs, **kwargs)
-
-
-def display_json(*objs, **kwargs):
-    """Display the JSON representation of an object.
-
-    Note that not many frontends support displaying JSON.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw json data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('application/json', objs, **kwargs)
-
-
-def display_javascript(*objs, **kwargs):
-    """Display the Javascript representation of an object.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw javascript data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('application/javascript', objs, **kwargs)
-
-
-def display_pdf(*objs, **kwargs):
-    """Display the PDF representation of an object.
-
-    Parameters
-    ----------
-    objs : tuple of objects
-        The Python objects to display, or if raw=True raw javascript data to
-        display.
-    raw : bool
-        Are the data objects raw data or Python objects that need to be
-        formatted before display? [default: False]
-    metadata : dict (optional)
-        Metadata to be associated with the specific mimetype output.
-    """
-    _display_mimetype('application/pdf', objs, **kwargs)
-
-
-#-----------------------------------------------------------------------------
-# Smart classes
-#-----------------------------------------------------------------------------
-
-
-class DisplayObject(object):
-    """An object that wraps data to be displayed."""
-
-    _read_flags = 'r'
-    _show_mem_addr = False
-
-    def __init__(self, data=None, url=None, filename=None):
-        """Create a display object given raw data.
-
-        When this object is returned by an expression or passed to the
-        display function, it will result in the data being displayed
-        in the frontend. The MIME type of the data should match the
-        subclasses used, so the Png subclass should be used for 'image/png'
-        data. If the data is a URL, the data will first be downloaded
-        and then displayed. If
-
-        Parameters
-        ----------
-        data : unicode, str or bytes
-            The raw data or a URL or file to load the data from
-        url : unicode
-            A URL to download the data from.
-        filename : unicode
-            Path to a local file to load the data from.
-        """
-        if data is not None and isinstance(data, string_types):
-            if data.startswith('http') and url is None:
-                url = data
-                filename = None
-                data = None
-            elif _safe_exists(data) and filename is None:
-                url = None
-                filename = data
-                data = None
-
-        self.data = data
-        self.url = url
-        self.filename = None if filename is None else unicode_type(filename)
-
-        self.reload()
-        self._check_data()
-
-    def __repr__(self):
-        if not self._show_mem_addr:
-            cls = self.__class__
-            r = "<%s.%s object>" % (cls.__module__, cls.__name__)
-        else:
-            r = super(DisplayObject, self).__repr__()
-        return r
-
-    def _check_data(self):
-        """Override in subclasses if there's something to check."""
-        pass
-
-    def reload(self):
-        """Reload the raw data from file or URL."""
-        if self.filename is not None:
-            with open(self.filename, self._read_flags) as f:
-                self.data = f.read()
-        elif self.url is not None:
-            try:
-                try:
-                    from urllib.request import urlopen  # Py3
-                except ImportError:
-                    from urllib2 import urlopen
-                response = urlopen(self.url)
-                self.data = response.read()
-                # extract encoding from header, if there is one:
-                encoding = None
-                for sub in response.headers['content-type'].split(';'):
-                    sub = sub.strip()
-                    if sub.startswith('charset'):
-                        encoding = sub.split('=')[-1].strip()
-                        break
-                # decode data, if an encoding was specified
-                if encoding:
-                    self.data = self.data.decode(encoding, 'replace')
-            except:
-                self.data = None
-
-class TextDisplayObject(DisplayObject):
-    """Validate that display data is text"""
-    def _check_data(self):
-        if self.data is not None and not isinstance(self.data, string_types):
-            raise TypeError("%s expects text, not %r" % (self.__class__.__name__, self.data))
-
-class Pretty(TextDisplayObject):
-
-    def _repr_pretty_(self, pp, cycle):
-        return pp.text(self.data)
-
-
-class HTML(TextDisplayObject):
-
-    def _repr_html_(self):
-        return self.data
-
-    def __html__(self):
-        """
-        This method exists to inform other HTML-using modules (e.g. Markupsafe,
-        htmltag, etc) that this object is HTML and does not need things like
-        special characters (<>&) escaped.
-        """
-        return self._repr_html_()
-
-
-class Markdown(TextDisplayObject):
-
-    def _repr_markdown_(self):
-        return self.data
-
-
-class Math(TextDisplayObject):
-
-    def _repr_latex_(self):
-        s = self.data.strip('$')
-        return "$$%s$$" % s
-
-
-class Latex(TextDisplayObject):
-
-    def _repr_latex_(self):
-        return self.data
-
-
-class SVG(DisplayObject):
-
-    _read_flags = 'rb'
-    # wrap data in a property, which extracts the <svg> tag, discarding
-    # document headers
-    _data = None
-
-    @property
-    def data(self):
-        return self._data
-
-    @data.setter
-    def data(self, svg):
-        if svg is None:
-            self._data = None
-            return
-        # parse into dom object
-        from xml.dom import minidom
-        svg = cast_bytes_py2(svg)
-        x = minidom.parseString(svg)
-        # get svg tag (should be 1)
-        found_svg = x.getElementsByTagName('svg')
-        if found_svg:
-            svg = found_svg[0].toxml()
-        else:
-            # fallback on the input, trust the user
-            # but this is probably an error.
-            pass
-        svg = cast_unicode(svg)
-        self._data = svg
-
-    def _repr_svg_(self):
-        return self.data
-
-class ProgressBar(DisplayObject):
-    """Progressbar supports displaying a progressbar like element 
-    """
-    def __init__(self, total):
-        """Creates a new progressbar
-        
-        Parameters
-        ----------
-        total : int
-            maximum size of the progressbar
-        """
-        self.total = total
-        self._progress = 0
-        self.html_width = '60ex'
-        self.text_width = 60
-        self._display_id = hexlify(os.urandom(8)).decode('ascii')
-
-    def __repr__(self):
-        fraction = self.progress / self.total
-        filled = '=' * int(fraction * self.text_width)
-        rest = ' ' * (self.text_width - len(filled))
-        return '[{}{}] {}/{}'.format(
-            filled, rest,
-            self.progress, self.total,
-        )
-
-    def _repr_html_(self):
-        return "<progress style='width:{}' max='{}' value='{}'></progress>".format(
-            self.html_width, self.total, self.progress)
-
-    def display(self):
-        display(self, display_id=self._display_id)
-
-    def update(self):
-        display(self, display_id=self._display_id, update=True)
-
-    @property
-    def progress(self):
-        return self._progress
-
-    @progress.setter
-    def progress(self, value):
-        self._progress = value
-        self.update()
-
-    def __iter__(self):
-        self.display()
-        self._progress = -1 # First iteration is 0
-        return self
-
-    def __next__(self):
-        """Returns current value and increments display by one."""
-        self.progress += 1
-        if self.progress < self.total:
-            return self.progress
-        else:
-            raise StopIteration()
-            
-    def next(self):
-        """Python 2 compatibility"""
-        return self.__next__() 
-
-class JSON(DisplayObject):
-    """JSON expects a JSON-able dict or list
-    
-    not an already-serialized JSON string.
-    
-    Scalar types (None, number, string) are not allowed, only dict or list containers.
-    """
-    # wrap data in a property, which warns about passing already-serialized JSON
-    _data = None
-    def _check_data(self):
-        if self.data is not None and not isinstance(self.data, (dict, list)):
-            raise TypeError("%s expects JSONable dict or list, not %r" % (self.__class__.__name__, self.data))
-
-    @property
-    def data(self):
-        return self._data
-    
-    @data.setter
-    def data(self, data):
-        if isinstance(data, string_types):
-            warnings.warn("JSON expects JSONable dict or list, not JSON strings")
-            data = json.loads(data)
-        self._data = data
-
-    def _repr_json_(self):
-        return self.data
-
-css_t = """$("head").append($("<link/>").attr({
-  rel:  "stylesheet",
-  type: "text/css",
-  href: "%s"
-}));
-"""
-
-lib_t1 = """$.getScript("%s", function () {
-"""
-lib_t2 = """});
-"""
-
-class Javascript(TextDisplayObject):
-
-    def __init__(self, data=None, url=None, filename=None, lib=None, css=None):
-        """Create a Javascript display object given raw data.
-
-        When this object is returned by an expression or passed to the
-        display function, it will result in the data being displayed
-        in the frontend. If the data is a URL, the data will first be
-        downloaded and then displayed.
-
-        In the Notebook, the containing element will be available as `element`,
-        and jQuery will be available.  Content appended to `element` will be
-        visible in the output area. 
-
-        Parameters
-        ----------
-        data : unicode, str or bytes
-            The Javascript source code or a URL to download it from.
-        url : unicode
-            A URL to download the data from.
-        filename : unicode
-            Path to a local file to load the data from.
-        lib : list or str
-            A sequence of Javascript library URLs to load asynchronously before
-            running the source code. The full URLs of the libraries should
-            be given. A single Javascript library URL can also be given as a
-            string.
-        css: : list or str
-            A sequence of css files to load before running the source code.
-            The full URLs of the css files should be given. A single css URL
-            can also be given as a string.
-        """
-        if isinstance(lib, string_types):
-            lib = [lib]
-        elif lib is None:
-            lib = []
-        if isinstance(css, string_types):
-            css = [css]
-        elif css is None:
-            css = []
-        if not isinstance(lib, (list,tuple)):
-            raise TypeError('expected sequence, got: %r' % lib)
-        if not isinstance(css, (list,tuple)):
-            raise TypeError('expected sequence, got: %r' % css)
-        self.lib = lib
-        self.css = css
-        super(Javascript, self).__init__(data=data, url=url, filename=filename)
-
-    def _repr_javascript_(self):
-        r = ''
-        for c in self.css:
-            r += css_t % c
-        for l in self.lib:
-            r += lib_t1 % l
-        r += self.data
-        r += lib_t2*len(self.lib)
-        return r
-
-# constants for identifying png/jpeg data
-_PNG = b'\x89PNG\r\n\x1a\n'
-_JPEG = b'\xff\xd8'
-
-def _pngxy(data):
-    """read the (width, height) from a PNG header"""
-    ihdr = data.index(b'IHDR')
-    # next 8 bytes are width/height
-    w4h4 = data[ihdr+4:ihdr+12]
-    return struct.unpack('>ii', w4h4)
-
-def _jpegxy(data):
-    """read the (width, height) from a JPEG header"""
-    # adapted from http://www.64lines.com/jpeg-width-height
-    
-    idx = 4
-    while True:
-        block_size = struct.unpack('>H', data[idx:idx+2])[0]
-        idx = idx + block_size
-        if data[idx:idx+2] == b'\xFF\xC0':
-            # found Start of Frame
-            iSOF = idx
-            break
-        else:
-            # read another block
-            idx += 2
-
-    h, w = struct.unpack('>HH', data[iSOF+5:iSOF+9])
-    return w, h
-
-class Image(DisplayObject):
-
-    _read_flags = 'rb'
-    _FMT_JPEG = u'jpeg'
-    _FMT_PNG = u'png'
-    _ACCEPTABLE_EMBEDDINGS = [_FMT_JPEG, _FMT_PNG]
-
-    def __init__(self, data=None, url=None, filename=None, format=None,
-                 embed=None, width=None, height=None, retina=False,
-                 unconfined=False, metadata=None):
-        """Create a PNG/JPEG image object given raw data.
-
-        When this object is returned by an input cell or passed to the
-        display function, it will result in the image being displayed
-        in the frontend.
-
-        Parameters
-        ----------
-        data : unicode, str or bytes
-            The raw image data or a URL or filename to load the data from.
-            This always results in embedded image data.
-        url : unicode
-            A URL to download the data from. If you specify `url=`,
-            the image data will not be embedded unless you also specify `embed=True`.
-        filename : unicode
-            Path to a local file to load the data from.
-            Images from a file are always embedded.
-        format : unicode
-            The format of the image data (png/jpeg/jpg). If a filename or URL is given
-            for format will be inferred from the filename extension.
-        embed : bool
-            Should the image data be embedded using a data URI (True) or be
-            loaded using an <img> tag. Set this to True if you want the image
-            to be viewable later with no internet connection in the notebook.
-
-            Default is `True`, unless the keyword argument `url` is set, then
-            default value is `False`.
-
-            Note that QtConsole is not able to display images if `embed` is set to `False`
-        width : int
-            Width in pixels to which to constrain the image in html
-        height : int
-            Height in pixels to which to constrain the image in html
-        retina : bool
-            Automatically set the width and height to half of the measured
-            width and height.
-            This only works for embedded images because it reads the width/height
-            from image data.
-            For non-embedded images, you can just set the desired display width
-            and height directly.
-        unconfined: bool
-            Set unconfined=True to disable max-width confinement of the image.
-        metadata: dict
-            Specify extra metadata to attach to the image.
-
-        Examples
-        --------
-        # embedded image data, works in qtconsole and notebook
-        # when passed positionally, the first arg can be any of raw image data,
-        # a URL, or a filename from which to load image data.
-        # The result is always embedding image data for inline images.
-        Image('http://www.google.fr/images/srpr/logo3w.png')
-        Image('/path/to/image.jpg')
-        Image(b'RAW_PNG_DATA...')
-
-        # Specifying Image(url=...) does not embed the image data,
-        # it only generates `<img>` tag with a link to the source.
-        # This will not work in the qtconsole or offline.
-        Image(url='http://www.google.fr/images/srpr/logo3w.png')
-
-        """
-        if filename is not None:
-            ext = self._find_ext(filename)
-        elif url is not None:
-            ext = self._find_ext(url)
-        elif data is None:
-            raise ValueError("No image data found. Expecting filename, url, or data.")
-        elif isinstance(data, string_types) and (
-            data.startswith('http') or _safe_exists(data)
-        ):
-            ext = self._find_ext(data)
-        else:
-            ext = None
-
-        if format is None:
-            if ext is not None:
-                if ext == u'jpg' or ext == u'jpeg':
-                    format = self._FMT_JPEG
-                elif ext == u'png':
-                    format = self._FMT_PNG
-                else:
-                    format = ext.lower()
-            elif isinstance(data, bytes):
-                # infer image type from image data header,
-                # only if format has not been specified.
-                if data[:2] == _JPEG:
-                    format = self._FMT_JPEG
-
-        # failed to detect format, default png
-        if format is None:
-            format = 'png'
-
-        if format.lower() == 'jpg':
-            # jpg->jpeg
-            format = self._FMT_JPEG
-
-        self.format = unicode_type(format).lower()
-        self.embed = embed if embed is not None else (url is None)
-
-        if self.embed and self.format not in self._ACCEPTABLE_EMBEDDINGS:
-            raise ValueError("Cannot embed the '%s' image format" % (self.format))
-        self.width = width
-        self.height = height
-        self.retina = retina
-        self.unconfined = unconfined
-        self.metadata = metadata
-        super(Image, self).__init__(data=data, url=url, filename=filename)
-        
-        if retina:
-            self._retina_shape()
-    
-    def _retina_shape(self):
-        """load pixel-doubled width and height from image data"""
-        if not self.embed:
-            return
-        if self.format == 'png':
-            w, h = _pngxy(self.data)
-        elif self.format == 'jpeg':
-            w, h = _jpegxy(self.data)
-        else:
-            # retina only supports png
-            return
-        self.width = w // 2
-        self.height = h // 2
-
-    def reload(self):
-        """Reload the raw data from file or URL."""
-        if self.embed:
-            super(Image,self).reload()
-            if self.retina:
-                self._retina_shape()
-
-    def _repr_html_(self):
-        if not self.embed:
-            width = height = klass = ''
-            if self.width:
-                width = ' width="%d"' % self.width
-            if self.height:
-                height = ' height="%d"' % self.height
-            if self.unconfined:
-                klass = ' class="unconfined"'
-            return u'<img src="{url}"{width}{height}{klass}/>'.format(
-                url=self.url,
-                width=width,
-                height=height,
-                klass=klass,
-            )
-
-    def _data_and_metadata(self):
-        """shortcut for returning metadata with shape information, if defined"""
-        md = {}
-        if self.width:
-            md['width'] = self.width
-        if self.height:
-            md['height'] = self.height
-        if self.unconfined:
-            md['unconfined'] = self.unconfined
-        if self.metadata:
-            md.update(self.metadata)
-        if md:
-            return self.data, md
-        else:
-            return self.data
-
-    def _repr_png_(self):
-        if self.embed and self.format == u'png':
-            return self._data_and_metadata()
-
-    def _repr_jpeg_(self):
-        if self.embed and (self.format == u'jpeg' or self.format == u'jpg'):
-            return self._data_and_metadata()
-
-    def _find_ext(self, s):
-        return unicode_type(s.split('.')[-1].lower())
-
-class Video(DisplayObject):
-
-    def __init__(self, data=None, url=None, filename=None, embed=False, mimetype=None):
-        """Create a video object given raw data or an URL.
-
-        When this object is returned by an input cell or passed to the
-        display function, it will result in the video being displayed
-        in the frontend.
-
-        Parameters
-        ----------
-        data : unicode, str or bytes
-            The raw video data or a URL or filename to load the data from.
-            Raw data will require passing `embed=True`.
-        url : unicode
-            A URL for the video. If you specify `url=`,
-            the image data will not be embedded.
-        filename : unicode
-            Path to a local file containing the video.
-            Will be interpreted as a local URL unless `embed=True`.
-        embed : bool
-            Should the video be embedded using a data URI (True) or be
-            loaded using a <video> tag (False).
-
-            Since videos are large, embedding them should be avoided, if possible.
-            You must confirm embedding as your intention by passing `embed=True`.
-
-            Local files can be displayed with URLs without embedding the content, via::
-
-                Video('./video.mp4')
-
-        mimetype: unicode
-            Specify the mimetype for embedded videos.
-            Default will be guessed from file extension, if available.
-
-        Examples
-        --------
-
-        Video('https://archive.org/download/Sita_Sings_the_Blues/Sita_Sings_the_Blues_small.mp4')
-        Video('path/to/video.mp4')
-        Video('path/to/video.mp4', embed=True)
-        Video(b'raw-videodata', embed=True)
-        """
-        if url is None and isinstance(data, string_types) and data.startswith(('http:', 'https:')):
-            url = data
-            data = None
-        elif os.path.exists(data):
-            filename = data
-            data = None
-        
-        if data and not embed:
-            msg = ''.join([
-                "To embed videos, you must pass embed=True ",
-                "(this may make your notebook files huge)\n",
-                "Consider passing Video(url='...')",
-            ])
-            raise ValueError(msg)
-
-        self.mimetype = mimetype
-        self.embed = embed
-        super(Video, self).__init__(data=data, url=url, filename=filename)
-
-    def _repr_html_(self):
-        # External URLs and potentially local files are not embedded into the
-        # notebook output.
-        if not self.embed:
-            url = self.url if self.url is not None else self.filename
-            output = """<video src="{0}" controls>
-      Your browser does not support the <code>video</code> element.
-    </video>""".format(url)
-            return output
-        
-        # Embedded videos are base64-encoded.
-        mimetype = self.mimetype
-        if self.filename is not None:
-            if not mimetype:
-                mimetype, _ = mimetypes.guess_type(self.filename)
-            
-            with open(self.filename, 'rb') as f:
-                video = f.read()
-        else:
-            video = self.data
-        if isinstance(video, unicode_type):
-            # unicode input is already b64-encoded
-            b64_video = video
-        else:
-            b64_video = base64_encode(video).decode('ascii').rstrip()
-        
-        output = """<video controls>
- <source src="data:{0};base64,{1}" type="{0}">
- Your browser does not support the video tag.
- </video>""".format(mimetype, b64_video)
-        return output
-
-    def reload(self):
-        # TODO
-        pass
-
-    def _repr_png_(self):
-        # TODO
-        pass
-    def _repr_jpeg_(self):
-        # TODO
-        pass
-
-def clear_output(wait=False):
-    """Clear the output of the current cell receiving output.
-
-    Parameters
-    ----------
-    wait : bool [default: false]
-        Wait to clear the output until new output is available to replace it."""
-    from IPython.core.interactiveshell import InteractiveShell
-    if InteractiveShell.initialized():
-        InteractiveShell.instance().display_pub.clear_output(wait)
-    else:
-        print('\033[2K\r', end='')
-        sys.stdout.flush()
-        print('\033[2K\r', end='')
-        sys.stderr.flush()
-
-
-@skip_doctest
-def set_matplotlib_formats(*formats, **kwargs):
-    """Select figure formats for the inline backend. Optionally pass quality for JPEG.
-
-    For example, this enables PNG and JPEG output with a JPEG quality of 90%::
-
-        In [1]: set_matplotlib_formats('png', 'jpeg', quality=90)
-
-    To set this in your config files use the following::
-    
-        c.InlineBackend.figure_formats = {'png', 'jpeg'}
-        c.InlineBackend.print_figure_kwargs.update({'quality' : 90})
-
-    Parameters
-    ----------
-    *formats : strs
-        One or more figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.
-    **kwargs :
-        Keyword args will be relayed to ``figure.canvas.print_figure``.
-    """
-    from IPython.core.interactiveshell import InteractiveShell
-    from IPython.core.pylabtools import select_figure_formats
-    # build kwargs, starting with InlineBackend config
-    kw = {}
-    from ipykernel.pylab.config import InlineBackend
-    cfg = InlineBackend.instance()
-    kw.update(cfg.print_figure_kwargs)
-    kw.update(**kwargs)
-    shell = InteractiveShell.instance()
-    select_figure_formats(shell, formats, **kw)
-
-@skip_doctest
-def set_matplotlib_close(close=True):
-    """Set whether the inline backend closes all figures automatically or not.
-    
-    By default, the inline backend used in the IPython Notebook will close all
-    matplotlib figures automatically after each cell is run. This means that
-    plots in different cells won't interfere. Sometimes, you may want to make
-    a plot in one cell and then refine it in later cells. This can be accomplished
-    by::
-    
-        In [1]: set_matplotlib_close(False)
-    
-    To set this in your config files use the following::
-    
-        c.InlineBackend.close_figures = False
-    
-    Parameters
-    ----------
-    close : bool
-        Should all matplotlib figures be automatically closed after each cell is
-        run?
-    """
-    from ipykernel.pylab.config import InlineBackend
-    cfg = InlineBackend.instance()
-    cfg.close_figures = close
-