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Thu Jul 1 23:45:52 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-July/045829.html

Bill Janssen wrote:
> I assume, though, that the args to "read()" and friends are still
> about bytes.

Yes. It is not possible to determine, in advance, the number of
bytes needed to decode a given number of characters. Therefore, a
codec typically needs to either read more bytes than requested,
or return less characters (if the bytes read don't happen to
end on a character boundary).

So the size parameter to .read() is just a hint - a codec might
chose to completely ignore it.

Regards,
Martin

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[Python-Dev] Allowing u.encode() to return non-strings