Thanks Марк Коренберг.

Thanks Марк Коренберг.

_odict_add_new_node() fails.

_odict_add_new_node() fails.

Implementation by Antoine Pitrou.

is raised when it returns NULL.

Simplify also ceval.c: rely on the fact that PyObject_GetItem() raised an
exception when it returns NULL.

requested name doesn't exist in globals: clear the KeyError exception before
calling PyObject_GetItem(). Fail also if the raised exception is not a
KeyError.

was mutated by direct calls of dict methods.

was mutated by direct calls of dict methods.

KeyError in C implementations as well as in Python implementation.

Added tests for OrderedDict subclasses.

KeyError in C implementations as well as in Python implementation.

Added tests for OrderedDict subclasses.

running tests in multiprocessing mode (-jN).

Use sys.platform instead of os.name to detect Windows in asyncio docs. Patch by Akira Li. (Merge 3.5->3.6)

Use sys.platform instead of os.name to detect Windows in asyncio docs. Patch by Akira Li. (Merge 3.4->3.5)