In Python, functions can also be used as return values. This is useful for creating functions that generate other functions based on some input. Here's an example:

def create_adder(x):
    def adder(y):
        return x + y
    return adder
 
add_five = create_adder(5)
result = add_five(3)
print(result)

In this example, we define the create_adder function that takes an argument x. Inside this function, we define the adder function that takes an argument y and returns the sum of x and y.

We then return the adder function from the create_adder function. We can now assign the result of calling create_adder with an argument of 5 to a variable add_five. This creates a new function that adds 5 to its argument. Finally, we call this new function with an argument of 3 and print the result, which is 8.

By returning a function from another function, we can create specialized functions on the fly based on some input. This technique can be used to cr