string - how to count repeated characters in text file using python -

i beginner in python , trying make small program in python count repeated character in text file

here code

import string   def count_char(text,char):     count = 0     c in text:         if c == char:             count +=1         return count  filename = raw_input("enter file name:") open(filename) f:     text=f.read()  print(count_char(text,"r")) 

but prints output as

>> 0 

please tell me wrong code ?

move return outside of loop. it's going through 1 iteration.