Ville Nummela added the comment:

My stats so far:

As of writing this, I have attempted to decompress about 5000 downloaded files 
(two years of tick data). 25 'bad' files were found within this lot.

I re-downloaded all of them, plus about 500 other files as the minimum lot the 
server supplies is 24 hours / files at a time.

I compared all these 528 file pairs using hashlib.md5 and got identical hashes 
for all of them.

I guess what I should do next is to go through the decompressed data and look 
for suspicious anomalies, but unfortunately I don't have the tools in place to 
do that quite yet.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21872>
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