How to Master Global and Local Variables in Python

Have you ever been puzzled by global and local variables in Python programming? This video offers detailed answers. We will show you how to define and use global variables in Python scripts and their differences from local variables. Through three examples, you’ll learn how to correctly call and modify global variables and understand the scope and declaration methods of internal function variables. This is a great opportunity to enhance your Python programming skills!

1. Video.

2. Python Source Code.

# Global variable
global_variable = "This is a global variable"

# Example of using a global variable inside a function
def use_global_variable():
    print("Using global variable inside function:", global_variable)

# Example of creating a local variable with the same name as the global variable inside a function
def local_variable_with_same_name():
    global_variable = "This is a local variable"
    print("Using local variable inside function:", global_variable)

# Example of creating a global variable inside a function using the global keyword
def create_global_variable():
    global another_global_variable
    another_global_variable = "This is another global variable"
    print("Creating and using another global variable inside function:", another_global_variable)

# Example of modifying a global variable inside a function using the global keyword
def modify_global_variable():
    global global_variable
    global_variable = "Global variable has been modified"
    print("Modifying global variable inside function:", global_variable)

def main():
    #use_global_variable()

    #local_variable_with_same_name()
    #print('global_variable:', global_variable)

    #create_global_variable()
    #print('another_global_variable:', another_global_variable)
    
    modify_global_variable()
    print("Using modified global variable outside function:", global_variable)

if __name__ == "__main__":
    main()