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This article will explain in detail what are the four ways of citing and transmitting parameters in Python. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Reference pass Ref 1: > a = 100# where an is an immutable type > def test (a):. The expression a+=a# has two meanings: 1. This may be a redefinition of a new variable aPermine 2. It is also possible to modify the value of a, but since the global # variable a cannot be modified, an an is redefined here. Print ("within function:% d"% a). > test (a) function: 200 > print (a) 100Ref 2: > a = [100] # where an is a list and is a variable type > def test (a):. Since list an is a mutable type, here is to modify a... Print ("within function:"). Within the print (a)... > > test (a) function: [100,100] > > print (a) [100,100] reference 3: > > a = 100,100 > > def test (a):. At first, a=a+a # is easy to understand, so it can be considered as equivalent to a=a+a, so it is the same as the reference. Print ("within function:% d"% a). > test (a) function: 200 > print (a) 100Ref 4: > a = [100A] > def test (a): # 1. Count the # 2 to the right of the = sign first. The result is [100100] # 3. A = [100100] # 4. Let the a variable point to [100100], that is, a holds a reference to [100100] (memory address). A=a+a # in this case, the a to the left of the equal sign is a redefined quantity, in which case a=a+an is not the same as a quantity. Print ("within function:"). Print (a)... > test (a) function: [100,100] > > print (a) [100] on what the four ways of passing parameters in Python are shared here, I hope the above content can be of some help to everyone and learn more knowledge. If you think the article is good, you can share it for more people to see.

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