[issue13149] optimization for append-only StringIO

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Like parts of the Python test suite, I use StringIO to capture print/write output for testing in an output...output/getvalue/reset(seek(0),truncate(0)) cycle. While this enhancement would not currently affect me (as I only do a few prints each cycle), I can easily imagine other cases where it would.

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nosy: +terry.reedy

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<http://bugs.python.org/issue13149>
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