How does ChainMap manage the mapping list in python

This article mainly introduces the python ChainMap how to manage the mapping list, the article is very detailed, has a certain reference value, interested friends must read it!

1. ChainMap stores all input mappings in an internal list.

2. The list can be accessed through public instance properties, and users can update it. The mapping .maps order matches the order passed to the middle.

This order defines the search order in which the key search operation is performed.

Used to access the internal list of mappings saved by .maps pets. This list is a regular Python list, so you can manually add and remove mappings, traverse the list, change the mapping order, and so on.

Example

> from collections import ChainMap > for_adoption = {"dogs": 10, "cats": 7, "pythons": 3} > vet_treatment = {"dogs": 4, "turtles": 1} > pets = ChainMap (for_adoption, vet_treatment) > > pets.maps [{'dogs': 10,' cats': 7, 'pythons': 3}, {' dogs': 4, 'turtles': 1}] all the contents of the article "how ChainMap manages the Mapping list in python" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!