Example Analysis of Local variables and Global variables in python

This article mainly introduces the example analysis of local variables and global variables in python, which has a certain reference value, and interested friends can refer to it. I hope you can learn a lot after reading this article.

Four basic types of functions

A local variable is a variable defined within a function [scope is limited to the interior of a function]

Different functions can define the same local variables, but using their own will not have an impact.

The role of local variables: in order to temporarily save data, it needs to be defined in the function for storage.

A variable whose scope is global.

If you want to modify the global variable inside the function, you must declare it using the Global keyword

Local variable def printInfo (): name='peter' # # Local variable, which only acts on the printInfo function. Print ('name') passdef TestMethod (): print (name) pass# TestMethod () printInfo () cannot be used outside the function body.

Pro=' computer Information Management'# A global variable with different scope def printInfo (): name='peter' # # local variable that only acts on printInfo functions. Print ('{}. {} '.format (name,pro)) passdef TestMethod (): name=' Wang Bao' print (name) pass# TestMethod () printInfo () cannot be used outside the function body.

Pro=' computer information management 'name=' Lulu' # when the global variable conflicts with the local variable, the local variable is preferred. When the local variable does not exist, the global variable def printInfo (): name='peter' # # local variable is used, which only acts on the printInfo function Print ('{}. {} '.format (name,pro)) passdef TestMethod () cannot be used outside the function body: name=' Wang Baobao' print (name) pass# TestMethod () printInfo ()

Pro=' computer information management 'name=' Lulu' def printInfo (): name='peter' # # local variable, which only acts on the printInfo function Print ('{}. {} '.format (name,pro)) passdef TestMethod (): name=' Wang Baobao' print (name) passdef changeGlobal ():''to modify the global variable: return:''pro=' Marketing' passchangeGlobal () print (pro) # # check whether it has been modified or not

Pro=' computer information management 'name=' Lulu' def printInfo (): name='peter' # # local variable, which only acts on the printInfo function Print ('{}. {} '.format (name,pro)) passdef TestMethod (): name=' Wang Baobao' print (name) passdef changeGlobal ():''to modify the global variable: return:''global pro pro=' Marketing' passchangeGlobal () print (pro) # # detect whether it has been modified

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