count characters in string python

1# Example usage:
2your_string = "Example usage"
3len(your_string)
4--> 13

1>>> sentence = 'Mary had a little lamb'
2>>> sentence.count('a')
34
4

1#use the built in function len()
2
3len("hello")
4
5#or you can count the characters in a string variable
6
7a = "word"
8len(a)