I'm confused... When I run python, there is no output in the terminal.

Hi Nicolas - this is because the set_num() function is ONLY setting a local variable of num inside the function to 5, and not printing it to the console. If you wanted to test how local vs global scope works, you could do something like this:

num = 10


def set_num():
    num = 5
    letter = 'a'
    print(letter)
    print(num)


set_num()
print(num)

^ In the code above, the first line creates a variable called num that is equal to an int of 10. Next, we define a function called set_num() that creates a local variable called num and sets its value to an int of 5. Next, we set create a local variable called letter and set its value to a string, 'a'. The final two lines of code in the function print the values stored for the local variables to the console. To see how this works, we can call the function set_num() and then print the value stored in the global value of num.

You should see an output of: 'a' 5 10