Multi module in PDM

[tisonkun]

Maven supports multiple modules and Cargo supports workspace.

I wonder if PDM has similar supports. I know we can have multiple Python modules in one project, but what if I'd like to write a monorepo with multiple projects? Is there some out-of-the-box supports or I just layout as:

/
|- project-a / pyproject.toml
|- project-b / pyproject.toml
...

I may expect

/
|- project-a / pyproject.toml
|- project-b / pyproject.toml
...
| - pyproject.toml

So that we can share some settings like metadata and dependencies management.

[rilshok]

I support the @tisonkun's request. This functionality is very important for me, I am actively looking for actual examples of how to properly build a mono repository consisting of many sub-modules.

[dranjan]

I haven't tried these yet, but I'll share what I know.

• This topic has been discussed here: Workspace support #1505
• There's also some information about this in the documentation: https://pdm-project.org/en/stable/usage/advanced/#use-pdm-to-manage-a-monorepo

One thing I'm not completely sure about is the workflow for managing dependencies of the subprojects, but maybe this is viable:

1. Manually modify the pyproject.toml in one or more subprojects.
2. Run pdm lock --update-reuse at the top level to update pdm.lock. (With --update-reuse, I think the edit+lock sequence shouldn't be too far from using pdm add|remove|update directly. I don't see a way to use these latter commands in the monorepo setup.)

[aniaan]

@tisonkun You can give uv a try.