How to end module definition?

Question

A common pattern I do on functions is, tip before answering the question, adding an "else" defeats the purpose of reducing nesting:

def fun(param):
    if param is None:
        return

    return do_something_with_param(param)

This allows me to reduce nesting by exiting out of the function returning None... Now on a module definition how to "return" in the module earlier?

Here's an example loosely based on what I'm trying to accomplish:

settings.py:

import os

from dotenv import load_dotenv

PROJECT_NAME = "Default Project Name"

ENV = os.getenv("ENV")

HOST = os.getenv("HOST")
PORT = os.getenv("PORT")

DATABASE_URL = os.getenv("DATABASE_URL")

if not DATABASE_URL:
    raise Exception("Figure out how to exit from the module earlier...")

DATABASE_URL += "?sslmode=disable"

As you can see if the DATABASE_URL is not provided (or any env variable) I would like to get out of the module and not run the rest of the code, without an else condition.

The module itself should be able to be imported, without the code that's at the end if the DATABASE_URL is not found.

by module you mean script? are you running this as a standalone script? Normally you can't control module definition, that is done in the C layer. — Josh Weinstein, Oct 06 '19 at 16:05
Raise ImportError if the module can't be successfully imported. — Dan D., Oct 06 '19 at 16:08
Put all of your module-level code inside a function, then call that function? You can then use your `return` trick as normal. — jasonharper, Oct 06 '19 at 16:09
Possible duplicate of [Programmatically stop execution of python script?](https://stackoverflow.com/questions/543309/programmatically-stop-execution-of-python-script) — Simon Crane, Oct 06 '19 at 16:57
Not script! The module needs to be imported and work but not run that that final line! — igorgue, Oct 07 '19 at 15:46
Would `quit()` exit my program? I only need to exit the module but be able to import it still. — igorgue, Oct 07 '19 at 15:51

How to end module definition?

0 Answers0