Containers and collections
The collections
module defines a number of collections above and beyond the built-in container classes. The container classes include namedtuple()
, deque
, ChainMap
, Counter
, OrderedDict
, and defaultdict
. All of these are examples of classes based on ABC definitions.
The following is a quick interaction to show how we can inspect collections to see the methods they will support:
>>> isinstance( {}, collections.abc.Mapping ) True >>> isinstance( collections.defaultdict(int), collections.abc.Mapping ) True
We can inspect the simple dict
class to see that it follows the basic mapping protocol and will support the required methods.
We can inspect a defaultdict
collection to confirm that it is also a mapping.
When creating a new ...
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