Docker image does not run with specified Python version

Question

I have a Dockerfile

FROM python:3.7.12-slim-buster
FROM aaftio/face_recognition
RUN pip install redis
RUN pip3 install glob2

RUN pip install face_recognition
COPY ./worker.py /worker.py
COPY ./rediswq.py /rediswq.py

CMD  python3 worker.py

I build the image and run my image with docker run -it {image_id}, but I see errors from python app - It complains about f-strings syntax as it is supported since python 3.6 I address that it uses some older python.

I debugged and get python version it printed 1.19.0

The error:

      File "worker.py", line 14
    for filename in glob.iglob(f"/root/divisions/{division_number}/" + '**/*.*', recursive=True):
                                                                   ^
SyntaxError: invalid syntax

I debugged and executed whereis python3 and the output is

python3: /usr/bin/python3.5m-config /usr/bin/python3.5 /usr/bin/python3 /usr/bin/python3.5-config /usr/bin/python3.5m /usr/lib/python3 /usr/lib/python3.5 /etc/python3.5 /etc/python3 /usr/local/bin/python3.4m-config /usr/local/bin/python3.4m /usr/local/bin/python3.4 /usr/local/bin/python3 /usr/local/bin/python3.4-config /usr/local/lib/python3.4 /usr/local/lib/python3.5 /usr/include/python3.5 /usr/include/python3.5m /usr/share/python3

what is the actual error message? when testing with python 3.7.12 (via pyenv?), do you get the same errors? — Adam Smooch
– Adam Smooch, Commented Oct 7, 2021 at 19:43
No, I don't get any errors when I run my python app without Docker. When I dockerize my python app like above and try to run it complains about f-string syntax. I debugged it and at beginning of code I put simple f-string and it complained there. — memoricab
– memoricab, Commented Oct 7, 2021 at 19:45
To troubleshoot this, start a shell inside the docker image (I don't remember the exact syntax off the top of my head but you should be able to google it). Then run python3 -v in that shell. Does the output match what you expect? If you do python3 worker.py in the docker shell, does it give the same errors? — Code-Apprentice
– Code-Apprentice, Commented Oct 7, 2021 at 19:46
@memoricab The problem is in the way you have defined the dockerfile and tried to create a multi stage build. Your end docker container will always be based of the last docker container you have used in your Dockerfile for you it is aaftio/face_recognition which uses Python 3.4.9 and not python:3.7.12-slim-buster which uses Python 3.7.12. Reference for multi-stage docker builds - here — kartikkillawala
– kartikkillawala, Commented Oct 7, 2021 at 20:15

kartikkillawala · Accepted Answer · 2021-10-08 00:53:26Z

The error is in the way you have defined the Dockerfile

While creating a docker multi stage build, your final container will always be based off the last docker container you have referenced

So in your case it will be aaftio/face_recognition which uses Python 3.4.9 and not python:3.7.12-slim-buster which uses Python 3.7.12

Reference for docker multi stage build - here

You can try something like this

FROM aaftio/face_recognition as intermediate
RUN pip install face_recognition


FROM python:3.7.12-slim-buster

#Copy the python installed libraries from intermediate container
#COPY --from=intermediate face_recognition

RUN pip install redis
RUN pip3 install glob2
COPY ./worker.py /worker.py
COPY ./rediswq.py /rediswq.py

CMD  python3 worker.py

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