[issue7471] GZipFile.readline too slow

[Nir Aides]

Nir Aides <nir at winpdb.org> added the comment:

How about using the first patch with the slicing optimization and 
additionally enhancing GzipFile with the methods required to make it 
play nice as a raw stream to an io.BufferedReader object (readable(), 
writable(), readinto(), etc...).

This way we still get the 350% speed up and keep it fully backward 
compatible, and if someone needs the extra performance they can feed it 
into an io.BufferedReader object thus:

g = gzip.GzipFile(...)
r = io.BufferedReader(g)
for line in r:
    ...

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7471>
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