Shulou(Shulou.com)06/03 Report--

For many beginners, it is easy to confuse global and local variables. I believe you should understand if you take a look at the explanation below.

The difference between the two.

Definition:

Global variables: inside the module, outside all functions, outside the class

Local variables: within the function, within the class method

Let's take a look at the example

Global variables are called inside the function

A = "hello" # Global variable a

Def test ():

Global a # calls the global variable a

When an is called later in the b = a # test method, it is all global a

Print (bmaine a)

Test ()

Call the global variable an in the test function to see the result of the run

After running, the values of global variables are hello.

The function uses a local variable with the same name as the global variable

A = "hello" # Global variable a

Def test ():

A = "hell0 local" # defines a local variable a

When an is called later in the b = a # test method, it is all local a

Print (b + ",", a)

Test ()

Here, another an is defined in the function test, which is a local variable, and then the a called in test is all local a. Take a look at the running results:

Modify the global variable value within the function

A = "hello" # Global variable a

Def test ():

Global a

A = "hell0 global" # modify the value of the global variable a

When an is called after b = a # test method, it is all global a

Print (b + ",", a)

Test ()

In the function test, the global an is declared first, and then the an is modified, which is tantamount to changing the value of the global variable a.

Take a look at the running results:

Note: the variable inside the method is before the = sign, which must be a local variable. If it appears after the = sign for the first time

On the other hand, it must be the called global variable; the global variable can be called in the function, and the local variable can only be called in the corresponding function.

It is called within the number, and cannot be called anywhere outside the function.

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