tl;dr:

INSTALLATION:

1. Install Python through pyenv (don't use python.org)
2. Install dependencies with Poetry (miniconda3 is also fine for some cases)

TESTING:

1. Write tests with pytest (default testing framework for Poetry)
2. Check test coverage with pytest-cov plugin
3. Use pre-commit for automatic checks before git commiting (for example, for automatic code refactoring)

REFACTORING:

1. Lint your code with flake8 to easily find bugs (it is not as strict as pylint)
2. Format your code with Black so that it looks the same in every project (is consistent)
3. Sort imports with isort (so that they are nicely organised: standard library, third party, local)