New submission from Matthew Gilson:

The man page for python says:

Warn about Python 3.x incompatibilities that 2to3 cannot trivially fix.

The official documentation (https://docs.python.org/2/using/cmdline.html#cmdoption-3) does not mention 2to3 at all:

Warn about Python 3.x possible incompatibilities by emitting a DeprecationWarning for features that are removed or significantly changed in Python 3.

This seems like a pretty big oversight when the following code issues no warnings (presumably because 2to3 can trivially handle this change):

``` from __future__ import print_function

class test(object): def __nonzero__(self): return False

t = test() if t: print('Hello') ```

---------- assignee: docs@python components: Documentation messages: 269994 nosy: docs@python, mgilson priority: normal severity: normal status: open title: -3 commandline option documented differently via man versions: Python 2.7

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