Why doesn't the code just show?

So I've been watching some videos, and then to you know remember everything I learn, I try to build my own stuff. What I'm doing is trying to make a program that's asking for delivering information and more, and then for not making so much code I made a function in another document, and then tried to import it, and that is successful but then when I run the code it just says "function valid_names at 0x109584158" instead of actual printing the code wanted.

Here is the program where the function is in.

def valid_names(name):
    their_name = input("What is your name? ")
    if len(name) < 1:
        print("Minimum characters is 1.")
    elif name == float or int:
        print("Unvalid character.")

And here is the actual program.

from actualfunction import valid_names

# This program will take your adress, phone number and more, so it'll know where to deliver the package
# Then it'll say when it's expected to get delivered, and of course when it has been delivered.
def printing_names(valid_names):
    print(valid_names)

printing_names(valid_names)

I know some other ways to make this work, but I'm trying to put a lot of code into a small space, instead of writing lines of lines of code.