Thomas Guettler added the comment:

I thought about this again. 

It could be solved with the help of a ByteCountingStreamReader.

With ByteCountingStreamReader I mean a wrapper around a stream like 
codescs.StreamReader. But the ByteCountingStreamReader should not changes the 
content, but just count the bytes it passed.

The ByteCountingStreamReader would be wrapped around ExFileObject.

This class could be handy in other situations.

What do you think?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24259>
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