How to find the common elements in two or more lists in Python?

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There are several ways to find the common elements in two or more python lists. When you have only two lists, you can use one of the following approaches:

>>> a=[1, 2, 4, 3]

>>> b=[3,4,5,6]>>> set(a).intersection(b)

{3, 4}>>> [i for i in b if i in a]

[3, 4]

>>> import numpy as np>>> np.intersect1d(a,b)

array([3, 4])

When you have more than two lists, you can use one of the following approaches:

>>> a=[1, 2, 4, 3]

>>> b=[3,4,5,6]

>>> c=[3,7,8,9,10]>>> [i for i in c if i in a and i in b]

[3]>>> set(a).intersection(c,b)

{3}

>>> from functools import reduce>>> reduce(np.intersect1d,(a,b,c))

array([3])