def subn(self, repl, string, count=0):
        """Return the tuple (new_string, number_of_subs_made) found by replacing
        the leftmost non-overlapping occurrences of pattern with the replacement
        repl."""
        return self._subx(repl, string, count, True)
def subn(self, repl, string, count=0):
        
        return self._subx(repl, string, count, True)
def subn ( self , repl , string , count = 0 ) : return self . _subx ( repl , string , count , True )
Return the tuple (new_string, number_of_subs_made) found by replacing
        the leftmost non-overlapping occurrences of pattern with the replacement
        repl.
Return the tuple ( new_string number_of_subs_made ) found by replacing the leftmost non - overlapping occurrences of pattern with the replacement repl .