[issue2503] Replace "== None/True/False" with "is"

[Wummel]

Wummel <calvin at users.sourceforge.net> added the comment:

Here is an updated patch, using "is False" to be consistent, and also
replacing the "!=" occurences.

Added file: http://bugs.python.org/file9886/0001-Replace-None-True-False-with-is.patch

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