Assigning a function to a variable

Question

Let's say I have a function

def x():
    print(20)

Now I want to assign the function to a variable called y, so that if I use the y it calls the function x again. if i simply do the assignment y = x(), it returns None.

Answer 1

You simply don't call the function.

>>> def x():
>>>     print(20)
>>> y = x
>>> y()
20

The brackets tell Python that you are calling the function, so when you put them there, it calls the function and assigns y the value returned by x (which in this case is None).