code: def bits_from_str(cls, s):
          
          try:
              if len(s) <= len(cls.__name__) or not s.startswith(cls.__name__):
                  return cls.bits_from_simple_str(s)
              c = s[len(cls.__name__)]
              if c == '(':
                  if not s.endswith(')'):
                      raise ValueError
                  return cls.bits_from_simple_str(s[len(cls.__name__)+1:-1])
              elif c == '.':
                  member_name = s[len(cls.__name__)+1:]
                  return int(cls.__all_members__[member_name])
              else:
                  raise ValueError
          except ValueError as ex:
              if ex.args:
                  raise
              raise ValueError("%s.%s: invalid input: %r" % (cls.__name__, cls.bits_from_str.__name__, s))
          except KeyError as ex:
              raise ValueError("%s.%s: Invalid flag name '%s' in input: %r" % (cls.__name__, cls.bits_from_str.__name__,
                                                                               ex.args[0], s))
docs: Converts the output of __str__ into an integer.