counter method in python

from collections import Counter
list1 = ['x','y','z','x','x','x','y','z']
print(Counter(list1))

Counter({'x': 4, 'y': 2, 'z': 2})

from collections import Counter
my_str = "Welcome to Guru99 Tutorials!"
print(Counter(my_str))

Counter({'o': 3, ' ': 3, 'u': 3, 'e': 2, 'l': 2, 't': 2, 'r': 2, '9': 2, 'W': 1,
 'c': 1, 'm': 1, 'G': 1, 'T': 1, 'i': 1, 'a': 1, 's': 1, '!': 1})