Simply create a new .py file in the same folder as your main Python code. Then “import” that file as you now know how to do, then access the functions from within that module.

Create an installer for your PyInstaller app: If you want a way to deploy your application other than a .zip file or the single-file distribution, consider using an installer utility like the open ...

Modern Python codebases deserve to have test suites, and the current tooling for testing makes creating test suites easier than ever. Python has its own built-in testing framework, unittest.