Serhiy Storchaka added the comment:
See issue19051. Even preliminary Python implementation noticeable speed up the
reading of short lines.
$ ./python -m timeit -s "import lzma, io" "f=lzma.LZMAFile('words.xz', 'r')"
"for line in f: pass"
Unpatched: 1.44 sec per loop
Patched: 1.06 sec per loop
With C implementation it should be as fast as with BufferedReader.
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<http://bugs.python.org/issue18003>
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