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Python global Keyword

By IncludeHelp Last updated : December 07, 2024

Description and Usage

The global is a keyword (case-sensitive) in python, it is used to declare a global variable inside a function (from a non-global scope).

As we know that variables are accessible within the same scope in which they are declared but a global variable can be accessed within a program anywhere. In python, we can define a global variable inside a function or in a non-global using by using global keyword.

Syntax

Syntax of global keyword:

global variable_name

Sample Input/Output

# function
def myfunc():
  # global variable
  global a
  # assigning the value to a
  a = 10

# main code
# function call 
myfunc()
print("outside the function a: ", a)
  
Output:
outside the function a:  10 

Example 1

Declare a global variable inside a function, assign the value after the declaration, and print the value inside and outside of the function.

# python code to demonstrate example of 
# gloabl keyword 

# function
def myfunc():
  # global variable
  global a
  # assigning the value to a
  a = 10
  # printing the value
  print("inside myfunc() a: ", a)

# main code
# function call 
myfunc()
print("outside the function a: ", a)

Output

inside myfunc() a:  10
outside the function a:  10

Example 2

# Declare a global variable
counter = 0

def increment():
    global counter  # Access the global variable
    counter += 1
    print(f"Counter inside function: {counter}")

# Call the function
increment()

# Check the value of the global variable
print(f"Counter outside function: {counter}")

Output

Counter inside function: 1
Counter outside function: 1