How to manage platform specific sub-dependencies

[nealkruis]

My example is that I am using doit for task automation, which includes macfsevents as an extra_requires on macOS.

In most cases, platform specific dependencies should be harmless on other operating systems. The real problem is that this particular dependency fails to install on other operating systems. The only way I have found to get around this is to remove the entry in the lock file (things still work fine on macOS without it--though I don't know if this is reliably the case for other sub-dependencies).

There's some related discussion in #3902.

My questions are:

1. Should pipenv be setting a platform specific marker for this sub-dependency and others in the extra_requires field?
2. Is there a method in the Pipfile to tell the environment to ignore specific sub-dependencies, or an alternative workaround where I don't have to modify the lock file?

[frostming]

If that is the case, you should mark the sub-dependencies in Pipfile as platform-specific, in the following way:

[packages]
macfsevents = {version="*", sys_platform="=='darwin'"}