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Today, I will talk to you about how to achieve local variables and global variables in python, many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

Local variable Local Variables

Enter:

#! / usr/bin/python

# Filename: func_local.py

X = 50

Def func (x):

Print ('x is', x)

X = 2

Print ('Changed local x to', x)

Func (x)

Print ('x is still', x)

Output:

X is 50

Changed local x to 2

X is still 50

Explanation:

The function of this example is to output the value of the variable x.

The first x is defined externally, and the second x is defined inside a function. The function of the function is to output the value of x first, then make a new definition, assign a new value to x, and then output the value of x.

Call this function to execute, the initial value of x is 50, the output statement inside the function changes x to 2, and the output is 2.

In another output statement outside the function, the value of x is still the initial value of 50.

It shows that the variables outside the function are global variables, and the scope is in the global environment, while the x inside the function is a local variable, which can only be changed within the function.

Global variable global Variables

Enter:

#! / usr/bin/python

# Filename: func_gobal.py

X = 50

Def func (x):

Global x

Print ('x is', x)

X = 2

Print ('Changed gobal x to', x)

Func (x)

Print ('Value of x is', x)

Output:

X is 50

Changed global x to 2

Value of x is 2

Explanation:

The difference between this example and the previous example is that inside the function, the variable x has an extra declaration, gobal x, which means that the x inside the function is now not a local variable, but a global variable.

As you can see in the output result, the value of x in the output statement outside the function changes after the declaration is added.

After reading the above, do you have any further understanding of how to implement local and global variables in python? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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