Find a string Hackerrank Python Solution

def count_substring(string,sub_string):

c=0

for n in range(len(string),0,-1):

try:

if string[n-len(sub_string):n]==sub_string:

c+=1

except IndexError:

break

return c

if __name__ == '__main__':

string = input().strip()

sub_string = input().strip()

count = count_substring(string, sub_string)

print(count)