[issue18316] Idle 2.7: update to simply cross-version patches

[Terry J. Reedy]

Terry J. Reedy added the comment:

I wrote a short script (already uploded) to differ 2.7 and 3.3 versions of an idlelib file. Applied to PyShell, I see unnecessary differences, like 'a,b' changed to 'a, b', or 'not a in b' changed to 'a not in b' only in 3.3 (probably for 3.0 when the necessary changes were made). When working on a particular file, I would be inclined to make the obvious updates to 2.7 first.

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