[issue20222] unittest.mock-examples doc uses builtin file which is removed in Python 3

[Roundup Robot]

Roundup Robot added the comment:

New changeset 36c9a233ebf0 by Terry Jan Reedy in branch '3.3':
Issue #20222: file is no longer a builtin in 3.x.
http://hg.python.org/cpython/rev/36c9a233ebf0

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nosy: +python-dev

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<http://bugs.python.org/issue20222>
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