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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9880928ec962 by Martin Panter in branch '3.5':
Issue #29349: Use __future__ print_function; Sphinx may use Python 2.6+
https://hg.python.org/cpython/rev/9880928ec962

New changeset 1708afd284ff by Martin Panter in branch '3.6':
Issues #29349: Merge Py 2.6+ compatibility from 3.5
https://hg.python.org/cpython/rev/1708afd284ff

New changeset e50058ecd808 by Martin Panter in branch 'default':
Issues #29349: Merge Py 2.6+ compatibility from 3.6
https://hg.python.org/cpython/rev/e50058ecd808

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