The most common way to solve this issue is to package the program together with all its supporting libraries and files and the Python runtime. There are tools for doing this, like PyInstaller ...

Improve your Python testing even more ... Here's how that looks in pytest: @pytest.fixture def simple_file(): return StringIO('\n'.join(['abc', 'def', 'ghi', 'jkl'])) On the face of it, this looks ...