[issue1569040] Speed up using + for string concatenation

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

For information, I haven't done any benchmarks, but the StringIO type in
Python 3.1 should be very efficient for this kind of purposes.

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nosy: +pitrou

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<http://bugs.python.org/issue1569040>
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