How can I resolve 'ModuleNotFoundError: No module named "CV"' in my Docker build?

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I'm running my project in Docker and encounter a ModuleNotFoundError for the 'CV' module, yet it works without Docker. Below is the error output:

BASH
server    | Traceback (most recent call last):
server    |   File "/project/server.py", line 12, in <module>
server    |     from CV.extra import keypoints_and_edges_for_display
server    | ModuleNotFoundError: No module named 'CV'

Here is my Dockerfile:

DOCKERFILE
Dockerfile
FROM ubuntu:24.04 as build
WORKDIR /project/
RUN apt-get update
RUN apt-get install -y curl
RUN apt-get install ffmpeg libsm6 libgl1 libxext6 -y
RUN curl -LsSf https://astral.sh/uv/install.sh | sh
COPY pyproject.toml /project/
COPY .python-version /project/
RUN $HOME/.local/bin/uv sync

FROM build
COPY server.py /project/
CMD $HOME/.local/bin/uv run python -OO server.py

I suspect the issue is that the Dockerfile only copies server.py, which omits the rest of my project files (including the CV package). How can I modify the Dockerfile to copy all required files into the image?

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

It looks like the Dockerfile isn’t copying all the source code into the image. In your container, only server.py is available, but your project relies on the CV package (and likely other files) that aren’t being added. To fix this issue, update your Dockerfile so that it copies your whole project directory (or at least the modules needed) into the image. For example:

DOCKERFILE
FROM ubuntu:24.04 as build
WORKDIR /project/
RUN apt-get update
RUN apt-get install -y curl ffmpeg libsm6 libgl1 libxext6
RUN curl -LsSf https://astral.sh/uv/install.sh | sh
COPY pyproject.toml /project/
COPY .python-version /project/
# If your source code (including the CV package) is needed for syncing dependencies, copy it here:
COPY . /project/
RUN $HOME/.local/bin/uv sync

FROM build
# If the code was already copied in the previous stage, you don't need to copy it again
# Otherwise, copy the rest of the source code:
# COPY . /project/
CMD $HOME/.local/bin/uv run python -OO server.py

Key Points

Include all required files: Make sure you copy the entire project (or at least the directories that contain your modules) into the image so that when server.py runs, it can find and import the CV package.
Multi-stage Build Consideration: If you’re using a multi-stage build where the build stage already has the full repository, you may not need to copy individual files again. Just ensure your final stage has access to all your application code.

This change should ensure that the container has the full application context and the CV package will be available at runtime.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by CelestialHunter282 • 1 month ago

When you run this in your Dockerfile

DOCKERFILE
COPY server.py /project/

you are only copying one file, server.py, to your Docker environment. Clearly, your project needs more than one file, so you should copy what is missing.

You could fix this with

DOCKERFILE
COPY . /project/

This will copy the contents of your directory . to the docker image (it won't copy the folder itself like cp would).

Or alternatively,

DOCKERFILE
COPY ./CV.py /project/

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How can I resolve 'ModuleNotFoundError: No module named "CV"' in my Docker build?

2 Answers

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