Can't compile certain dependencies (cartopy, pyhdf)

[ingwinlu]

It is quite common (and sometimes necessary) for some libraries to depend on other dependencies in their setup.py. Currently pip-compile can't handle those cases as those imports fail.

relevant upstream issues:
SciTools/cartopy#1552

Environment Versions

1. all (tested on linux)
2. Python version: python 3.8.3
3. pip version: pip 20.1.1
4. pip-tools version: 5.2.1

Steps to replicate

1. requirements.in with either cartopy or pyhdf in it, other lines optional)
2. run pip-compile

Expected result

success and requirements.txt is produced

Actual result

pip-compile exception due to exceptions raised in the dependencies package files

[atugushev]

Hello @ingwinlu,

Thanks for the issue! AFAIU, it looks like there is no clear solution at the moment. Science libs (e.g., cartopy) require NumPy (and many more) at the setup time, so you have to satisfy those requirements before pip-compile being run.

[atugushev]

I'll close this based on the above, but please let us know if it doesn't resolve your issue. Thanks!