What are the differences between value passing and reference passing in python

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Difference

1. Value passing applies to arguments of immutable types, and reference passing applies to mutable types.

2. When the value of the function parameter is passed, if the parameter changes, it will not affect the value of the parameter. When the reference is passed, the value of the parameter is changed, and the value of the parameter is also changed.

Example

Def param_test (obj): obj + = obj print ('parameter value is:', obj) print ('* value transfer *') a = 'programmer Feige' print ('a) param_test (a) print ('argument value is:', a) print ("* reference transfer *") b = [1,2,3] print ('b value is:' B) param_test (b) print ('the value of the argument is:', b) Thank you for reading! This is the end of the article on "what is the difference between python value passing and reference passing". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!