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In [4]: import random
In [7]: set1 = set(random.sample(range(100000), 20000))
In [8]: set2 = set(random.sample(range(100000), 20000))
In [9]: %timeit len(set1.intersection(set2))
1000 loops, best of 3: 880 µs per loop
In [10]: len(set1.intersection(set2))
Out[10]: 3963