Re: Speed-up for loops

[Stefan Behnel]

Michael Kreim, 03.09.2010 11:21:
So finally I followed the recommendation of Tim Wintle to use cython. I
did not know this before, but I figured out the following:
additionWintle2.pyx:
>
def addition():
    cdef long imax = 1000000000
    cdef long a = 0
    cdef long i
    for i in xrange(imax):
       a = a + 10
    print a
=> runs (wall clock time): 0:00.04

Note that this isn't the "real" runtime. If you look up the binary code 
that the C compiler spits out, you'll most likely find the final result for 
"a" written down as a literal that gets returned from the function. C 
compilers do these things to benchmarks these days.

Stefan

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