#17872 Python module mapping with transient dependency New discussion created by Jackevansevo I've been having some difficultly with pants trying to infer the owners of an import. Specifically where the library name is nonstandard and transitive. A reproduce-able example is available in a standalone repository Specifically I'm using a library called

ariadne

, which I've placed in a poetry

pyproject.toml

file:

[tool.poetry.dependencies]
python = "^3.8"
ariadne = "^0.13.0"

Which itself depends on a library called

graphql-core

, the

graphql-core

package exposes

graphql

(see here) My

BUILD

file (after running

./pants tailor ::

) looks as follows:

poetry_requirements(
    name="poetry0",
)

python_sources(
    name="root",
)

I'm running a simple script

import ariadne
from graphql.execution import MiddlewareManager

if __name__ == "__main__":
    print("hello world", MiddlewareManager, ariadne)

Running the script gives me:

./pants --no-pantsd run main.py

12:03:59.01 [WARN] Pants cannot infer owners for the following imports in the target //main.py:root:

  * graphql.execution.MiddlewareManager (line: 2)

If you do not expect an import to be inferrable, add `# pants: no-infer-dep` to the import line. Otherwise, see <https://www.pantsbuild.org/v2.14/docs/troubleshooting#import-errors-and-missing-dependencies> for common problems.
hello world <class 'graphql.execution.middleware.MiddlewareManager'> <module 'ariadne' from '/Users/jack/.cache/pants/named_caches/pex_root/venvs/6be7984cc4edd737a5b88632bd3ebc4b81ac2419/1600009f0b703061a214410767329cc05f8fd614/lib/python3.9/site-packages/ariadne/__init__.py'>

Given

graphql-core

is a dependency of

ariadne

how do I inform

pants

about this dependency? I've unsuccessfully tried the following:

poetry_requirements(
    name="poetry0",
    module_mapping={
        "graphql-core": ['graphql'],
    },
)

Would I have to explicitly add this dependency to my

pyproject.toml

or is there another mechanism to map module names I'm no aware of? pantsbuild/pants