How to create a python module as a single callable function?

Question

I'd like to write the module as a function and not a class.

Is there a way to make this work as intended?

greet.py

def main(x):
    print(f'Hello {x}!')

Now how do I write the module so that when greet is executed, main runs.

main.py

import greet

greet('Foo') # output: Hello Foo!

Answer 1

Unfortunately, this isn't possible.

An object, class, or function can be callable, but a module cannot.

You can, however, name things conveniently:

[greet.py]
def greet(x):
     ...

[main.py]
    from greet import greet
    greet('foo')