STINNER Victor <victor.stin...@haypocalc.com> added the comment:
Benchmark:
a) ./python -m timeit "(b'\xc3\xa9' * 10000).decode('utf-8')"
b)./python -m timeit "(''.join( map(chr, range(0, 128)) )*1000).encode('utf-8')"
c) ./python -m timeit "f=open('Misc/ACKS', encoding='utf-8'); acks=f.read();
f.close()" "acks.encode('utf-8')"
d) ./python -m timeit "f=open('Misc/ACKS', 'rb'); acks=f.read(); f.close()"
"acks.decode('utf-8')"
Original -> patched (smallest value of 3 runs):
a) 85.8 usec -> 83.4 usec (-2.8%)
b) 548 usec -> 688 usec (+25.5%)
c) 132 usec -> 144 usec (+9%)
d) 65.9 usec -> 67.3 usec (+2.1%)
Oh, decode 2 bytes sequences are faster with my patch. Strange :-)
But 25% slower to encode a pure ASCII text is not a good news.
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<http://bugs.python.org/issue2857>
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