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cdef extern from "Python.h":
############################################################################
# 6.5 Iterator Protocol
############################################################################
bint PyIter_Check(object o)
# Return true if the object o supports the iterator protocol.
object PyIter_Next(object o)
# Return value: New reference.
# Return the next value from the iteration o. If the object is an
# iterator, this retrieves the next value from the iteration, and
# returns NULL with no exception set if there are no remaining
# items. If the object is not an iterator, TypeError is raised, or
# if there is an error in retrieving the item, returns NULL and
# passes along the exception.
# To write a loop which iterates over an iterator, the C code should look something like this:
# PyObject *iterator = PyObject_GetIter(obj);
# PyObject *item;
# if (iterator == NULL) {
# /* propagate error */
# }
# while (item = PyIter_Next(iterator)) {
# /* do something with item */
# ...
# /* release reference when done */
# Py_DECREF(item);
# }
# Py_DECREF(iterator);
# if (PyErr_Occurred()) {
# /* propagate error */
# }
# else {
# /* continue doing useful work */
# }
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