[issue14260] re.groupindex available for modification and continues to work, having incorrect data inside it

[Matthew Barnett]

Matthew Barnett <python at 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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<http://bugs.python.org/issue14260>
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