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).

Answer 2

When you assign a function to a variable you don't use the () but simply the name of the function.

In your case given def x(): ..., and variable silly_var you would do something like this:

silly_var = x 

and then you can call the function either with

x() 

or

silly_var()