[docs] [issue29349] Update old Python 2 code in Docs/tools/extensions/patchlevel.py

[Ned Deily]

Ned Deily added the comment:

These changes have broken some buildbots, for example, the OS X dmg buildbots which are still using Python 2 for sphinx builds of the docs.  They should be version agnostic as much as possible.

http://buildbot.python.org/all/builders/bolen-dmg-3.x/builds/59

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nosy: +ned.deily
resolution: fixed -> 
stage: resolved -> needs patch
status: closed -> open

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<http://bugs.python.org/issue29349>
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