I've been starting with pulumi programs in typescript, but I have a lambda that needs to be in python to take advantage of a particular 3p library. Does anyone know if I can deploy a lambda written in python from a pulumi program written in typescript?

Yes. There's no problem here.

ahah, that was my next question

You can do it from Pulumi, but then you have to manage pre-deploy code carefully. There are mixins in Pulumi for this, but I find them less than helpful, because they conflate pre-deploy and in-deploy logic.

Thanks!

If you did want to do it in Pulumi, it might look something like this — this example is written in Python and zips up a Python function, but the TS program code would be structurally the same: https://github.com/pulumi/templates/blob/master/serverless-aws-python/__main__.py#L21-L25

That uses FileArchive to create a zip of a directory. It's a great example, but it doesn't deal with the problem of dependencies. Is there another example of a Python lambda with some dependent packages?

You could use the Pulumi Command provider inside the program, or a build step (makefile, npm script, etc.) run before

pulumi up

to run steps like in AWS' docs: https://docs.aws.amazon.com/lambda/latest/dg/python-package.html#python-package-create-package-with-dependency e.g.: (pseudocode)

const packageDeps = new command.local.run({
  "command": "pip install ... && zip -r ../my-deployment-package.zip . && ...",
  "dir": "./function",
});

I got bitten by uploading

.zip

with python several times (depend on packages) so in my case, I prefer building docker images with python instead. Docker build flow is well integrated in pulumi as well.