Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment:

The re module creates the dict purely for the benefit of the user, and as it's 
a normal dict, it's mutable.

An alternative would to use an immutable dict or dict-like object, but Python 
doesn't have such a class, and it's probably not worth writing one just for 
this use-case.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14260>
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