How to create objects by ChainMap in python

Editor to share with you how to create objects in ChainMap in python, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Description

1. Create the object .fromkeys () using the ChainMap class method.

2. Use iterated keys and optional default values for all keys. If you call the ChainMap and iteration key on .fromkeys () as arguments, the resulting chain map is a dictionary.

The key comes from the input iterable object, and the default value is None. Alternatively, the second parameter can be transmitted. Fromkeys () provides a reasonable default value for each key.

Example

> from collections import ChainMap > ChainMap.fromkeys (["one", "two", "three"]) ChainMap ({'one': None,' two': None, 'three': None}) > ChainMap.fromkeys (["one", "two", "three"], 0) ChainMap ({' one': 0, 'two': 0,' three': 0}) above are all the contents of the article "how to create objects in python". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!