For missing dependencies, more specifics will be required for deeper insight. IME, it usually comes up due to dynamic dependencies, e.g. using

sqlalchemy

to access a Postgres database requires a postgres driver like

asyncpg

, but

sqlalchemy

doesn't literally depend on that package, so we declare:

python_requirements(
    source="exported_requirements.txt",
    overrides={
        "sqlalchemy": {"dependencies": ["backend#asyncpg", "backend#greenlet"]},
    }
)

which means any

import sqlalchemy

will have pants include the

asyncpg

package too. Alternatively, this can be set on a more fine-grained basis (e.g. if one particular file has an extra dynamic dependency, add the override to the

python_sources(...)

target itself). Does that sound relevant?