Difference Between Global and Local Variables in Python

Global Variables:

Global variables are those variables that are defined in the main body of the program file. They are visible throughout the program file.

Example:

pi = 3.142       
radius = 7       
def circle():
    global radius               # radius is a global variable
    radius = radius * 2         
    area_of_circle = pi * (radius) ** 2
    print("The area of the circle is: ", area_of_circle)

Local Variables:

A variable which is defined within a function is called Local Variables. It can be accessed from the point of its definition until the end of the function in which it is defined.

Example:

pi = 3.142            # local variable 
radius = 7            # local variable
area_of_circle = 0   
area_of_circle = pi * (radius) ** 2        
print("The area of the circle is: ", area_of_circle)

Global Variable vs Local Variable:

Global Variables	Local Variables
1. It defines in the main body of the program file.	1. It defines within a function and it is local to that function.
2. It can be accessed throughout the program file.	2. It can be accessed from the point of its definition until the end of the block in which it is defined.
3. Global variables are accessible to all functions in the program.	3. It's not related in any way to other variables with the same names are used outside the function.