# collections.abc --- Abstract Base Classes for Containers — Collections Abstract Base Classes

> The collections module offers the following ABCs ============================== ====================== ======================= ==================================================== ABC Inherits from Abstract Methods Mixin Methods ============================== ====================== =================

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The collections module offers the following ABCs

============================== ====================== ======================= ==================================================== ABC Inherits from Abstract Methods Mixin Methods ============================== ====================== ======================= ==================================================== Container [1]_ contains Hashable [1]_ hash Iterable [1]_ [2]_ iter Iterator [1]_ Iterable next iter Reversible [1]_ Iterable reversed Generator [1]_ Iterator send, throw close, iter, next Sized [1]_ len Callable [1]_ call Collection [1]_ Sized, contains, Iterable, iter, Container len

Sequence Reversible, getitem, contains, iter, reversed, Collection len index, and count

MutableSequence Sequence getitem, Inherited Sequence methods and setitem, append, clear, reverse, extend, delitem, pop, remove, and iadd len, insert

ByteString Sequence getitem, Inherited Sequence methods len

Set Collection contains, le, lt, eq, ne, iter, gt, ge, and, or, len sub, rsub, xor, rxor and isdisjoint

MutableSet Set contains, Inherited Set methods and iter, clear, pop, remove, ior, len, iand, ixor, and isub add, discard

Mapping Collection getitem, contains, keys, items, values, iter, get, eq, and ne len

MutableMapping Mapping getitem, Inherited Mapping methods and setitem, pop, popitem, clear, update, delitem, and setdefault iter, len

MappingView Sized init, len and repr ItemsView MappingView, contains, Set iter KeysView MappingView, contains, Set iter ValuesView MappingView, contains, iter Collection Awaitable [1]_ await Coroutine [1]_ Awaitable send, throw close AsyncIterable [1]_ aiter AsyncIterator [1]_ AsyncIterable anext aiter AsyncGenerator [1]_ AsyncIterator asend, athrow aclose, aiter, anext Buffer [1]_ buffer ============================== ====================== ======================= ====================================================

testing an interface by verifying the required methods are present and have not been set to None. This only works for simple interfaces. More complex interfaces require registration or direct subclassing.

registered as Iterable or that have an ~container.iter method, but it does not detect classes that iterate with the ~object.getitem method. The only reliable way to determine whether an object is iterable is to call iter(obj).

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