The variable scope problem of Python

Accidentally fell into a hole. Carefully analyzed the following reasons. It turns out to be a variable scope problem. The simple abstraction is as follows:

id=1# many line codes [ID for ID in range] #许多行代码if id!=1:    #做一些事情    passelse:    #做另外一些事情

As a result, the ID

[ID for ID in range (10)]

has been affected by the change, leading to the production of insect pests.

The next variable scope is explored, and the conclusion is as follows:

1. A variable with the same name in the function does not affect the variable with the same name outside the function (if any adornments are added-for example, global)

Id=1def Test ():    id=2print id#===1

2. The minimum scope of a variable is a function. Inside the function, the function of the variable is from the beginning to the end. (This differs from other languages)

id = 1if True:    id=2print id#===2id = 1for i in range:    id=iprint i#====9

Also the following is OK:

If True:    b=1print B

Output 1, does not become a local temporary code block variable because B is under If/for/while!

The minimum scope of a variable is a function, or even an extreme point, and the following is also output 1:

For I in range: for J in    Range (2): If true: If true:                    c=1print C

　　

The variable scope problem of Python