Lib/test/test_userstring.py · abb34fe9f3e9a1d4fe2bedee315e360fbf0b2ce5 · Kirill Smelkov / cpython · GitLab

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UserString.MutableString has been removed in Python 3.0. · abb34fe9
Brett Cannon authored May 29, 2008
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Works on issue #2877. Thanks Quentin Gallet-Gilles for the patch.
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