Jürgen A. Erhard added the comment:

To add to this (without looking at the patch): I just to my astonishment 
learned that a ZipExtFile doesn't even support tell().  I can understand the 
seek being nontrivial... but the tell?  It's a bytestream, and there is (isn't 
there?) a clear definition of what next byte a read(1) would deliver.  It 
should be trivial to keep track of the (only ever increasing) file position.

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nosy: +jae

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<http://bugs.python.org/issue22908>
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