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Speed of list comprehension vs for loop with append
# On my Windows 7 64-bit machine running CPython 2.6
C:\>python -m timeit -s "lst = [1] * 100" "out = [x for x in lst if x]"
100000 loops, best of 3: 6.55 usec per loop
C:\>python -m timeit -s "lst = [1] * 100" "out = []" "for x in lst:" " if x:" " out.append(x)"
100000 loops, best of 3: 14.7 usec per loop
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