#22918: Drop obsolete mention of 'keys' in datamodel __iter__ docs.

Patch by Chaitanya Agrawal.

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branch : 3.4
fix path to patchlevel.py

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branch : 3.4
extra : source : d3d04d5aace80447ecd15311b5541f41d6a9f164
Issue #23016: A warning no longer produces AttributeError when the program
is run with pythonw.exe.

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branch : 3.4
Issue #23006: Improve the documentation and indexing of dict.__missing__.
Add an entry in the language datamodel special methods section.
Revise and index its discussion in the stdtypes mapping/dict section.

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branch : 3.4
Issue #23006 whitespace

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branch : 3.4
whitespace

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branch : 3.4