Hi, I'm trying to bundle my app with

python_awslambda

, in a similar fashion as a

pex_binary

:

pex_binary(
    name="performance_profile",
    entry_point="performance_profile.py",
    interpreter_constraints=["==3.11.*"],
    dependencies=[":src"],
)

python_awslambda(
    name="lambda_performance_profile",
    runtime="python3.11",
    handler="lambda_function.py:performance_profile_handler",
    dependencies=[":src"],
)

I can create and run the pex file, but I am struggling with this error for the second use case :

stderr:
Failed to resolve requirements from PEX environment @ /home/..
Needed cp311-cp311-linux_x86_64 compatible dependencies for:
 1: pillow>=6.2.0
    Required by:
      matplotlib 3.8.0
    But this pex had no ProjectName(raw='pillow', normalized='pillow') distributions.

which I tried to solve by explicitly adding

pillow

to the dependencies. But then I encounter an other error :

stderr:
A distribution for pillow could not be resolved for cp311-cp311-linux_x86_64.
Found 1 distribution for pillow that do not apply:
1.) The wheel tags for Pillow 9.5.0 are cp311-cp311-manylinux_2_28_x86_64 which do not match the supported tags of cp311-cp311-linux_x86_64:
cp311-cp311-manylinux2014_x86_64
... 113 more ...

that is, I'm afraid, as far as I could get. How come the supported tag does not mention

manylinux

? how does the dependency resolver differ between

python_awslambda

and

pex_binary

?

Sorry for the trouble. What version of pants? Are those errors when you build the lambda or when you run it in AWS?

I'm using Pants 2.17.0, this error arises when building with

pants package

Ah okay. You may need to switch to providing a

complete_platforms

parameter to the target to accurately convey which wheels need to be selected. In https://github.com/pantsbuild/pants/discussions/18756 I describe more about how/why to do this. You can take the file from https://github.com/pantsbuild/pants/blob/main/src/python/pants/backend/awslambda/python/complete_platform_3.11-x86_64.json (Pants 2.18 has an extra feature to automatically provide an appropriate file)

sounds promising, thanks ! I’ll try my luck first thing tomorrow

It's the same resolver. The difference is the

pex_binary

is built for a local interpreter but the

python_awslambda

is built for a foreign interpreter (the one the AWS Lamba runtime provides). What Pants version is this? The answer is complete_platforms, but how you set that up depends on the Pants version.

it's 2.17

Hrm, weird. I now see a bunch of conversation above my response that I did not see before. Sorry for the noise!