If you use pip and requirements.txt, the dependency resolution is not great, it just installs things in order. There isn't a lock file. How do you deal with de

If you use pip and requirements.txt, the dependency resolution is not great, it just installs things in order. There isn't a lock file. How do you deal with dev dependencies? How do you work on a lib and its calling code without pushing it to pypa? Working with c deps? All this stuff feels harder to do then it should be.