dict((i, a.count(i)) for i in a)
>>> l = ["a","b","b"] >>> l.count("a")
arr = np.array( [1, 2, 3, 2, 1, 2]) occ = np.count_nonzero(arr==0) print(occ) 0 occ = np.count_nonzero(arr==1) print(occ) 2
from collections import Counter