[issue15503] concatenating string in dict unexpected performance

[Alex Gaynor]

Alex Gaynor added the comment:

Actually, I would argue that it's concatentation of a local variable which has unexpected performance. Logically it should be O(n**2), however due to hacks in CPython it isn't.

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nosy: +alex

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<http://bugs.python.org/issue15503>
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