How do I use a global variable inside a function using Python?

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Marie

Asked: August 9, 20222022-08-09T09:35:15+00:00 2022-08-09T09:35:15+00:00Computer programming

How do I use a global variable inside a function using Python?

Hi

I have a variables that is declared outsides fucntions.

How can I use and change these variables inside function usign Python?

thank you

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Gwennavia · Accepted Answer · 2022-08-09T09:40:14+00:00

Follow this example to create a variable outside functions, and use it inside the functions:

MyVariable = 99 #this is a global variable

def changeAndPrint_GlobalVariable():
    global MyVariable  #use global variable in this function with "global" keyword
    print('Global variable "MyVariable" before change = ', MyVariable) # the global variable is printed
    MyVariable = 1  #change the value of the global variable is printed
    print('Global variable "MyVariable" after change = ', MyVariable) # the global variable is printed

def changeAndPrint_LocalVariable():
    MyVariable = 77 #this is a local variable
    print('Local variable "MyVariable" = ', MyVariable) #the local variable is printed

changeAndPrint_GlobalVariable() #call the function
changeAndPrint_LocalVariable() #call the function

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MyVariable = 99 #this is a global variable

def changeAndPrint_GlobalVariable():

global MyVariable #use global variable in this function with "global" keyword

print('Global variable "MyVariable" before change = ', MyVariable) # the global variable is printed

MyVariable = 1 #change the value of the global variable is printed

print('Global variable "MyVariable" after change = ', MyVariable) # the global variable is printed

def changeAndPrint_LocalVariable():

MyVariable = 77 #this is a local variable

print('Local variable "MyVariable" = ', MyVariable) #the local variable is printed

changeAndPrint_GlobalVariable() #call the function

changeAndPrint_LocalVariable() #call the function

This code will print:

Global variable "MyVariable" before change =  99
Global variable "MyVariable" after change =  1
Local variable "MyVariable" =  77

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Global variable "MyVariable" before change = 99

Global variable "MyVariable" after change = 1

Local variable "MyVariable" = 77

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