#!/usr/local/bin/python3
from abc import abstractmethod
from collections import Container, Iterable, Mapping, Sequence, Sized

class Array(Sized, Iterable, Container):
    __slots__ = ()

    @abstractmethod
    def __getitem__(self, key):
        raise KeyError

class C(object):
  def __len__(self):
    pass

print(issubclass(C, Array))