[issue6931] dreadful performance in difflib: ndiff and HtmlDiff

[Gregory P. Smith]

Changes by Gregory P. Smith <greg at krypto.org>:


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versions: +Python 3.4, Python 3.5 -Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6931>
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