[issue14744] Use _PyUnicodeWriter API in str.format() internals

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> Not quite honest contrexample

I agree, this example is not honest :-) It's because of the magical value 100 used as initial size of the buffer. The speed is the same for shorter or longer strings.

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<http://bugs.python.org/issue14744>
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