HYRY wrote: > Peter Otten wrote: > > HYRY wrote: > > > > > I want to join two mono wave file to a stereo wave file by only using > > > the default python module. > > > Here is my program, but it is much slower than the C version, so how > > > can I increase the speed? > > > I think the problem is at line #1, #2, #3. > > > > > oarray = array.array("h", [0]*(len(larray)+len(rarray))) #1 > > > > ITEMSIZE = 2 > > size = ITEMSIZE*(len(larray) + len(rarray)) > > oarray = array.array("h") > > oarray.fromstring("\0" * size) > > > > may be a bit faster. > > > > Peter > > Thank you very much, that is just what I want.
Even faster: oarray = larray + rarray C:\Python25>python -m timeit -s"from array import array; N = 10**6" "a =array('h'); a.fromstring('\0'*(2*N))" 100 loops, best of 3: 9.57 msec per loop C:\Python25>python -m timeit -s"from array import array; N = 10**6; b = array('h', [0])*(N/2); c = b[:]" "a = b + c" 100 loops, best of 3: 5.7 msec per loop -- Leo -- http://mail.python.org/mailman/listinfo/python-list