Web Reference: 1 day ago · A ChainMap groups multiple dicts or other mappings together to create a single, updateable view. If no maps are specified, a single empty dictionary is provided so that a new chain always has at least one mapping. Python’s ChainMap was added to collections in Python 3.3 as a handy tool for managing multiple scopes and contexts. This class allows you to group several dictionaries and other mappings together to make them logically appear and behave as one. In Python 3.3 a ChainMap class was added to the collections module: A ChainMap class is provided for quickly linking a number of mappings so they can be treated as a single unit.
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