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Editor to share with you how python uses the setdefault function, 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!

The built-in function setdefault of the dictionary

Function of setdefault: get the value of a key. If key does not exist in the dictionary, key will be added and value will be set as the default value.

Usage of the setdefault function: dict.setdefault (key,value). The parameter key is the value of the key,value to be obtained and the corresponding key. If the key does not exist, the corresponding key is stored in the default value of the dictionary.

Examples are as follows:

User = {'name':' Neo', 'age': 18} value = user.setdefault (' name', 'Jack') print (the content of the'\ 'user\' dictionary is:', user,';\ 'setdefault\' the value of\ 'name\' of the\ 'user\' dictionary obtained is:', value) # the execution result is as follows: # > 'user' dictionary: {' name': 'Neo',' age': 18} The name' value of the 'user' dictionary' obtained by setdefault' is: Neouser = {'name':' Neo', 'age': 18} value = user.setdefault (' birthday', '1990-01-01') print ('\ 'user\' dictionary content is:', user,' \ 'setdefault\' the value of\ 'birthday\' of the\ 'user\' dictionary obtained is:', value) # the execution result is as follows: # > 'user' dictionary: {' name': 'Neo',' age': 18, 'birthday':' 1990-01-01'} The 'birthday'' value of the 'user' dictionary' obtained by setdefault' is: 1990-01-01 is all the contents of the article "how python uses setdefault functions". 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!

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