python count matches in string code example

Example 1: string count substring occurences pytohn

string.count(substring, [start_index], [end_index])

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