Return a (minutes, months) tuple after parsing a "M,N" string.

def read_minutes_months(self, s):
        """Return a (minutes, months) tuple after parsing a "M,N" string.
        """
        try:
            (minutes, months) = [int(x.strip()) for x in s.split(',')]
            return minutes, months
        except Exception:
            raise ParsingError(('Value should be "minutes, months"'))