I have a toy fastapi app, and i want to bundle uvicorn into the pex. If my requirements are

python_requirement(
    name="fastapi",
    requirements=["fastapi==0.75.2"],
)

python_requirement(
    name="uvicorn",
    requirements=["uvicorn==0.17.6"],
)

Then I can get a package without problems (at least during build, it doesn’t quite run how I want to yet, but that’s another question) If I update the uvicorn dependency to be

uvicorn[standard]==0.17.6

then I see something like this (with different packages failing on each run:

22:13:20.62 [INFO] Completed: Building app/app_binary.pex with 2 requirements: fastapi==0.75.2, uvicorn[standard]==0.17.6
22:13:20.62 [ERROR] 1 Exception encountered:

  ProcessExecutionFailure: Process 'Building app/app_binary.pex with 2 requirements: fastapi==0.75.2, uvicorn[standard]==0.17.6' failed with exit code 1.
stdout:

stderr:
ERROR: Could not find a version that satisfies the requirement websockets>=10.0; extra == "standard" (from uvicorn[standard])
ERROR: No matching distribution found for websockets>=10.0; extra == "standard"

What am I missing?

Which version of Pants is this? And are you using lockfiles? And which platform are you running all this on?

It’s Pants 2.10, running without lockfiles on intel mac, python 3.8.

Hmm, I don't reproduce this on the same environment.

I’m seeing this in CI on an ubuntu container too Here’s the code: https://github.com/mmusnjak/pants-extras

👀

Thank you! That works perfectly!