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Can't this code:
 class Sequence(Sized, Iterable, Container):
 # ...
 def __contains__(self, value):
 for v in self:
 if v == value:
 return True
 return False
Be shortened into this: 
 class Sequence(Sized, Iterable, Container):
 # ...
 def __contains__(self, value):
 return any(item == value for value in self)
Which can even fit on one line with a lambda: 
 class Sequence(Sized, Iterable, Container):
 # ...
 __contains__ = lambda self: any(item == value for value in self)