[docs] [issue11762] Ast doc: warning and version number

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

The Python Insider blog has a nice phrasing: “The AST module exposes a constant, ``ast.__version__``, which provides a means for user code to vary its behaviour depending on the version of the AST it encounters.”

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11762>
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