[issue3873] Unpickling is really slow

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

One problem with the seek() approach is that some file-like objects have expensive seeks. One example is GzipFile, where seek(n) is O(n) (it first rewinds to the start of file, then reads n decompressed bytes). In the end, unpickling from a GzipFile becomes O(n**2).

I will try to use peek() instead.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3873>
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