Thomas Kluyver added the comment:

It wasn't as bad as I thought (hopefully that doesn't mean I've missed 
something). zipfile-open-w6.patch allows interleaved reads and writes so long 
as the underlying file object is seekable.

You still can't have multiple write handles open (it wouldn't know where to 
start the second file), or read & write handles on a non-seekable stream (I 
don't think a non-seekable read-write file ever makes sense, except perhaps for 
a pty, which is really two separate streams on one file descriptor).

Tests are passing again.

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Added file: http://bugs.python.org/file42588/zipfile-open-w6.patch

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<http://bugs.python.org/issue26039>
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