Lucas Prado Melo <lukepada...@gmail.com> added the comment:

There's a problem with my patch... When the size of the data we want to
peek is too big ( > buffer_len - start ) the cursor will move, thus
there isn't a case where the peek function would work properly (except
when we want to peek() just 1 byte).
Couldn't we use a read() followed by a seek() instead?

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<http://bugs.python.org/issue5811>
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