count occurrence in array python

1dict((i, a.count(i)) for i in a)

1>>> l = ["a","b","b"]
2>>> l.count("a")

1arr = np.array( [1, 2, 3, 2, 1, 2])
2occ = np.count_nonzero(arr==0)
3print(occ)
40
5occ = np.count_nonzero(arr==1)
6print(occ)
72

1from collections import Counter