How can a global variable be modified inside a function in Python?

In Python, a global variable can be modified inside a function by using the global keyword. This keyword tells the function that you want to use the global variable defined outside the function, rather than creating a new local variable with the same name.

Here’s an example:

# Define a global variable
global_var = 0

def update_global_variable():
    global global_var  # Declare that we are using the global variable
    global_var = 10    # Modify the global variable
    print("Global variable inside function:", global_var)

# Call the function to update the global variable
update_global_variable()

# Print the global variable outside the function
print("Global variable outside function:", global_var)

In this example, the update_global_variable function modifies the global_var variable, and the change is reflected outside the function as well.