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In [1]: a = xrange(1, 100 + 1) sq = (lambda x: x*x) %timeit abs(sum(map(sq, a)) - sq(sum(a))) abs(sum(map(sq, a)) - sq(sum(a)))
a = xrange(1, 100 + 1) sq = (lambda x: x*x) %timeit abs(sum(map(sq, a)) - sq(sum(a))) abs(sum(map(sq, a)) - sq(sum(a)))
10000 loops, best of 3: 32.7 us per loop Out[1]: 25164150
10000 loops, best of 3: 32.7 us per loop
25164150