How to define global variables in Python

This article shows you how to define global variables in Python, which is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

1. Declaration method

The method is to declare the global variable definition directly in the current module, use the declaration method of global, and then refer to it!

OLD_URL=' http://oldboyedu.com'

Def bb ():

Global OLD_URL

OLD_URL = OLD_URL +'# m'

If _ _ name__=='__main__':

Bb ()

Print OLD_URL

# output:

Http://oldboyedu.com#m

two。 Module method

The method is to define the global variable in a separate module, and then import the defined global variable module in the global module that needs to be used.

# gl.py global variable module definition

GL_A='hello'

GL_B='world'

# test.py global variable reference module

Import gl

Def hello_world ()

Print gl. GL_A, GL_B

Output helloworld

The above is how to define global variables in Python. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.