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This article mainly introduces "is the result of a + = b and a = a + b the same in Python". In daily operation, I believe that many people have doubts about the same result of a + = b and a = a + b in Python. The editor consulted all kinds of data and sorted out a simple and useful method of operation. I hope it will be helpful to answer the question of "is the result of a + = b and a = a + b in Python the same?" Next, please follow the editor to study!

Mutable and immutable types want to know whether the results of a + = b and a = a + b are the same. You need to know what are variable and immutable variables first. Immutable types in Python: number, string, tuple variable type: list, dictionary immutable type operation example immutable + =

Immutable = immutable type the result is the same after + = and = +. The example of variable type operation is variable + = variable type + situation variable = + variable type a=a+b case. Through the comparison of the above figure, we find that the results of variable type variables in a + = b and a=a+b are not the same. In the + = operation, A1 and a2 values change at the same time, but A1 and a2 cannot be changed at the same time when adding before assigning values. You must keep in mind the above conclusion, the difference between _ _ add__ and _ _ iadd__ the _ _ add__ method takes two parameters and returns their sum, and the values of the two parameters remain the same. The _ _ iadd__ method receives two parameters. The value of the first parameter changes the variable type using the plus sign operation (that is, a=a+b). The call to _ _ add__ returns a new object, and the original object remains unchanged. The schematic diagram is as follows:

After A1 = A1 + b, A1 points to the new result, but a2 points to the invariable type using the + = operation (that is, astatb), and the _ _ iadd__ method is called, and the value of the first parameter changes, that is, the content of A1 points to change, and the pointing position does not change. The schematic diagram is as follows: after A1 + = b, the content of A1 points to change, and the location of the pointing does not change, so the content of a2 will also change here with A1. The study on "is the result of a + = b and a = a + b in Python is the same?" is over. I hope it can solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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