Martin v. Löwis <mar...@v.loewis.de> added the comment:

It would be interesting to see how often the "bad" case triggers, i.e. that a 
write-only stringio sees any of the other methods invoked at all.
As a special case, you may consider that .truncate(0) doesn't really need to 
realize the buffer first.

I also wonder how much StringIO will be used in praxis, as opposed to BytesIO.

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nosy: +loewis

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