En Mon, 16 Nov 2009 19:30:27 -0300, Hyunchul Kim
<[email protected]> escribió:
I want to improve speed of following simple function.
Any suggestion?
**********
def triple(inputlist):
results = []
for x in inputlist:
results.extend([x,x,x])
return results
**********
These are my best attempts:
def triple3(inputlist):
results = []
append = results.append
for x in inputlist:
append(x); append(x); append(x)
return results
def triple4(inputlist, _three=xrange(3)):
return [x for x in inputlist for _ in _three]
For a 400-items list, triple3 is 40% faster and triple4 25% faster than
yours.
--
Gabriel Genellina
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