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In [1]: %timeit a = 2**10**6
%timeit a = 2**10**6
10 loops, best of 3: 27.1 ms per loop
In [2]: %timeit pow(2, 10**6, 10)
%timeit pow(2, 10**6, 10)
1000000 loops, best of 3: 850 ns per loop