Module not found in Docker container

user_12037085 0
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I know there are several posts about this but I couldn't quite understand.

I have the following project structure:

engine
--alpha-api
----app.py
----__init__.py
--api_utils
----utils.py
----__init__.py
--beta_api

and I have the following Dockefile:

FROM public.ecr.aws/lambda/python:3.8

COPY . ${LAMBDA_TASK_ROOT}
WORKDIR ${LAMBDA_TASK_ROOT}

RUN pip install -r ./alpha-api/requirements.txt --target ./alpha-api

The Dockerfile is under the alpha-api. That cannot be changed since I have two different lambdas in the same repo. When I run docker build with the context of the engine directory I do maintain the context and get the same project structure. (docker build -f ./alpha-api/Dockerfile -t alpha-api . )

However, when i run a container and call ./alpha-api/app.py I get the following error:

Traceback (most recent call last):
  File "app.py", line 9, in <module>
    from api_utils.utils import DateStringFormat
ModuleNotFoundError: No module named 'api_utils'

Do you know why it doesn't recognize api_utils?

dockerfile docker python
2 Answers

When you run python ./alpha-api/app.py, Python will only have all files within ./alpha-api in its path.

Setting your PYTHONPATH to ./ (or ${LAMBDA_TASK_ROOT}) prior to running the file could help.

user_94783840

In order for python python to understand that a folder is actually a python module, it must contain a __init__.py file. Try adding an empty __init__.py to your api_utils folder.

user_23543440
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