Are functions being executed when they're defined? Or does the function's code run when it is called without the "def"?

Answer 1

They are not executed, however the code around them is executed. For example:

print('Im executed right away')

@my_decorator('Im also executed')
def my_func():
print('Im not executed till the function is called')

Answer 2

Thanks everyone!

Answer 3

The functions code run when called

Answer 4

Def my_function(x): #function defined
x * 2

my_function(4). #function called

You always need to define a funcation before calling it...for example, if you wrote the above code the other way round (call the function first), it will produce an error