find common between two lists python code example

Example 1: find common elements in two lists python

list1 = [1,2,3,4,5,6]
list2 = [3, 5, 7, 9]
list(set(list1).intersection(list2))

Example 2: find number of common element in two python array

len([x for x in list1 if x in list2])

Example 3: python common elements in two arrays

# using numpy
import numpy as np
a = np.array([1,2,3,2,3,4,3,4,5,6])
b = np.array([7,2,10,2,7,4,9,4,9,8])
# using intersect1d
print(np.intersect1d(a,b))
# output
# [2 4]