Antoine Pitrou <pit...@free.fr> added the comment:

> Here is a proof-of-concept patch for the pure Python version of
> TextIOWrapper.tell(). It turns the O(CHUNK_SIZE) operation into an
> O(1) operation most of time (still O(CHUNK_SIZE) worst-case - weird
> decoders and/or crazy input).

Actually, that's wrong. The patch is still O(CHUNK_SIZE) but with a
vastly different multiplier (and, optimistically, much smaller, as
common codecs are codecs in C).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11114>
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