Hello 🙂 can some please explain to me how pants resolves the requirements? I have a `python_binary`target that has local dependencies that are compiled before the `pyprep`goal. But when I execute the created PEX, it does not include the compiled local dependencies

There are two parts to requirement resolution depending on the flavor of requirement and it sounds like you have the first part set up. Firstly, a target must have a BUILD dependency on its requirements, whether they be local (say a

python_library

BUILD target) or third party. Secondly, in the third party case, the dependency is on a

python_requirement_library

or requirements.txt file via

python_requirements

. I'll stop there to find out more about your dependency setup.

in my `python_binary`target, I have defined a local dependency. However the modules for that package are created during a task before the `pyprep`goal. And when the binary is created, the modules are not found

Aha. There is a fair bit of work to get generated code seen by Pants in general still. We have that wrapped up in a base class here: https://github.com/pantsbuild/pants/blob/aeb800d621881164a3973e393f86a843aa5254af/src/python/pants/task/simple_codegen_task.py#L30-L31 Do you happen to know if your task uses this base class? It doesn't absolutely have to, but if it does not, it needs to be calling `self.context.add_new_target`: https://github.com/pantsbuild/pants/blob/master/src/python/pants/task/simple_codegen_task.py#L349 and `self.context.build_graph.inject_dependency`: https://github.com/pantsbuild/pants/blob/master/src/python/pants/task/simple_codegen_task.py#L364

but that does not allow me to add an existing target, right? Is there a way to overwrite it?

It does. The general scheme is as follows: Given: targetA depends on targetB:

targetA -> targetB

targetB has python code generated from the files it owns. Then: The code generating task: 1. generates py files from targetB 2. creates a "synthetic" target targetBprime whose sources are the generate files from step 1 3. adds a dependency on targetBprime to targetA

Ah I see 💡 Thank you very much! 😊