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

[Ned Deily]

Ned Deily added the comment:

Dunno for sure, perhaps David can answer that.  But the Sphinx docs imply that Sphinx 1.4.6 requires at least 2.6 and I don't test the installer build with anything less than 2.7.

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