Antoine Pitrou <pit...@free.fr> added the comment:

I'm not a zlib specialist, but I think what this means is that the stream is 
not finished, but it's valid anyway.

For example, you get the same behaviour by doing:

c = zlib.compressobj()
s = c.compress(b'This is just a test string.')
s += c.flush(zlib.Z_FULL_FLUSH)

The resulting bytestring is a non-terminated zlib stream. It still decompresses 
to the original data fine.

I think the appropriate fix is to add an argument to flush(). Here is a patch, 
I named the argument "strict" by lack of imagination :)

----------
Added file: http://bugs.python.org/file22828/zlibflushstrict.patch

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<http://bugs.python.org/issue12646>
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