Find a string hackerrank

def count_substring(string, sub_string):
    count =0

    for i in range(0,len(string)-len(sub_string)+1):
        if sub_string==string[i:i+len(sub_string)]:

            count+=1
    return count     
if __name__ == '__main__':
    string = input().strip()
    sub_string = input().strip()
    
    count = count_substring(string, sub_string)
    print(count)