Hello here! TL;DR: Should I use requirements.txt, or should I have my dependencies only listed inside setup.py? Long version: The two most common ways to have dependencies listed in a python package are either having them listed both in setup.py and requirements.txt files, or having them only listed in requirements.txt and then import them using some `parse_requirements` methods. In the projects which I am currently working on there are five lists of requirements: - requirements.txt - requirements_test.txt - requirements_dev.txt - install_requires inside setup.py - tests_require inside setup.py I wanted to remove duplicities, so I thought about removing the setup.py lists and parse the dependencies from the requirements*.txt files. But then I came across this, https://stackoverflow.com/a/28842733, which recommends using a `dev` entry in `extras_require` and then using `pip install -e .[dev]` to install them, which could be easily extended to also have a `pip install -e .[test]`. I find this a very clean option, since it reduces the amount of files the repository and makes setup.py and makes setup.py self-contained. Are any known drawbacks to this approach? Is it a good way to go? Regards, -- Carles Sala Cladellas carles@pythiac.com / +34 666 278 679 https://www.pythiac.com Pythia Consulting - Data Science as a Service