python string number of occurrences code example

Example 1: check how many letters in a string python

#use the built in function len()

len("hello")

#or you can count the characters in a string variable

a = "word"
len(a)

Example 2: count substring in string python

def count_substring(string,sub_string):
    l=len(sub_string)
    count=0
    for i in range(len(string)-len(sub_string)+1):
        if(string[i:i+len(sub_string)] == sub_string ):      
            count+=1
    return count