If you repeat lots of bash commands while developing then makefiles can help you out. They allow you to automate steps easily from the terminal.

You may need to install some dependencies, this is done via;

pip install pytest flake8
There's a few files we use. They are shown below.
Makefile
test:
    pytest tests.py
clean:
    rm -rf __pycache__ .pytest_cache
Note when you copy the above file; the indentation
must be a tab in a Makefile. What you copy may contain spaces instead.
common.py
def add(n1, n2):
  return n1 + n2
tests.py
from common import add
def test_add():
    assert add(1, 1) == 2