list count same elements code example

Example 1: count similar values in list python

MyList = ["a", "b", "a", "c", "c", "a", "c"]

return my_dict = {i:MyList.count(i) for i in MyList}
# returns :
{'a': 3, 'c': 3, 'b': 1}
 # OR
from collections import Counter
return my_dict = dict(Counter(MyList))
# returns :   
{'a': 3, 'c': 3, 'b': 1}
# the both returns the same so it's up to you to choose the one you prefere ;)

Example 2: count occurrence in array python

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