Hi all, I'm having a problem with imports not being picked up by Pants, is anyone able to help please? Directory structure:

/src/my_app/my_app.py
/src/my_app/utils.py
/tests/test_my_app.py

my_app.py

from utils import func1, func2, func3

test_my_app.py

from my_app.my_app import function_to_test

pants.toml

[source]
root_patterns = [
  ".",
  "/cdk",   # AWS CDK stuff in Python, not relevant to this
  "/src",
  "/tests",
]

/src/my_app/BUILD

python_sources()

pants dependees src/my_app/utils.py

20:06:56.42 [WARN] Pants cannot infer owners for the following imports in the target src/my_app/my_app.py:

  * utils.func1 (line: 8)
  * utils.func2 (line: 8)
  * utils.func3 (line: 8)

pants dependencies src/my_app:my_app

src/my_app/my_app.py
src/my_app/utils.py

have you tried

from my_app.utils import func1, func2, func3

Sorry, I meant to add that. I've tried that and pants picks it up. However, when I run my app in a docker container I get a module not found error. I've not got as far as managing docker builds with pants yet.

ok, so that’s is another issue, and is the correct solution for this issue.

It's a basic Dockerfile:

ARG FUNCTION_DIR="/function"

FROM ubuntu:20.04

RUN ... # install some dependencies etc.

ARG FUNCTION_DIR

COPY ./my_app.py ${FUNCTION_DIR}/
COPY ./utils.py ${FUNCTION_DIR}/
COPY ./entrypoint.sh /entrypoint.sh

WORKDIR ${FUNCTION_DIR}

ENTRYPOINT [ "/entrypoint.sh" ] # python my_app.py

It works fine if I do

from utils import ...

but not with

from my_app.utils import ...

yes, that is a rather crude way of getting your sources into the container 😛 you need to preserve the directory name of

my_app

for the sources

So if I do

COPY my_app $FUNCTION_DIR/

my entrypoint script should run

python my_app/my_app.py

is that correct?

have look at https://github.com/pantsbuild/example-docker as well as https://github.com/pantsbuild/example-python for some inspiration..

Great, thanks for taking the time to help me! I'll let you know how I get on.

great!

Unfortunately that didn't work 😞