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Python 2.7 itertools.product vs nested for loops vs nested for comprehension
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| import timeit | |
| def test_performance(code, setup='pass', TIMES=10): | |
| avg = lambda l: sum(l)/len(l) | |
| result = timeit.Timer(code, setup).repeat(3,10) | |
| print avg(result) | |
| NESTED_FOR = """ | |
| for x in xrange(1000): | |
| for y in xrange(1000): | |
| pass | |
| """ | |
| test_performance(NESTED_FOR) | |
| NESTED_COMPREHENSION = """ | |
| for x,y in [ (x,y) for x in xrange(2500) for y in xrange(2500) ]: | |
| pass | |
| """ | |
| test_performance(NESTED_COMPREHENSION) | |
| SETUP = """from itertools import product""" | |
| ITERTOOLS_PRODUCT_1 = """ | |
| for x, y in product(xrange(1000), repeat=2): | |
| pass | |
| """ | |
| test_performance(ITERTOOLS_PRODUCT_1, setup=SETUP) | |
| SETUP = """from itertools import product""" | |
| ITERTOOLS_PRODUCT_2 = """ | |
| for x, y in product(xrange(1000), xrange(1000)): | |
| pass | |
| """ | |
| test_performance(ITERTOOLS_PRODUCT_2, setup=SETUP) | |
| # RESULTS | |
| # 0.127683003743 | |
| # 8.17029802004 | |
| # 0.268307367961 | |
| # 0.262320359548 |
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https://github.com/python/cpython/blob/2.7/Modules/itertoolsmodule.c -> Implementation of product