python substring count

1string.count(substring, [start_index], [end_index])

1def count_substring(string, sub_string):
2    c = 0
3    while sub_string in string:
4        c += 1           
5        string = string[string.find(sub_string)+1:]
6    return c
7

1count = string.count(substring)

1def count_substring(string,sub_string):
2    l=len(sub_string)
3    count=0
4    for i in range(len(string)-len(sub_string)+1):
5        if(string[i:i+len(sub_string)] == sub_string ):      
6            count+=1
7    return count  
8