Python in docker container

Question

I am new to Docker so I am sorry for such an easy question.

I am building a docker container which is built on top of a image which is built on ubuntu:vivid image. When executing my script within the container I am getting an error:

exec: "python": executable file not found in $PATH

How can I solve this? When I try to run apt-get install python in my Docker file:

FROM my_image # based on ubuntu:vivid

RUN apt-get update && \
    apt-get install -y python3

ENV PATH /:$PATH

COPY file.py /

CMD ["python", "file.py", "-h"]

I get:

WARNING: The following packages cannot be authenticated!
  libexpat1 libffi6 libmagic1 libmpdec2 libssl1.0.0 libpython3.4-minimal
  mime-support libsqlite3-0 libpython3.4-stdlib python3.4-minimal
  python3-minimal python3.4 libpython3-stdlib dh-python python3 file
E: There are problems and -y was used without --force-yes
The command '/bin/sh -c apt-get update &&   apt-get install -y python3' returned a non-zero code: 100
make: *** [image] Error 1

EDIT: added Dockerfile content

apt-get install python or try to find python executable in ur machine and add to $PATH??? — minhhn2910
– minhhn2910, Commented Jan 28, 2016 at 4:09
@cricket_007 Since mine is already based on a different image I can't do that — Ela
– Ela, Commented Jan 28, 2016 at 4:12
Please add your Dockerfile contents. Simply running apt-get from the container's shell isn't preferred — OneCricketeer
– OneCricketeer, Commented Jan 28, 2016 at 4:19

Community · Accepted Answer · 2017-05-23 11:54:12Z

2

You have similar issue with some Linux distribution: "Why am I getting authentication errors for packages from an Ubuntu repository?"

In all cases, the usual sequence of command to install new packages is:

RUN apt-get update -yq && apt-get install -yqq \
    git \
    python \
    ...

The OP Ela reports in the comments:

RUN apt-get update -y && apt-get install -y --force-yes \
    git \
    python \
    ...

edited May 23, 2017 at 11:54

CommunityBot

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answered Jan 28, 2016 at 6:05

VonC

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3 Comments

Ela Over a year ago

I tried your approach and then got

Do you want to continue? [Y/n] Abort. The command '/bin/sh -c apt-get update && 	apt-get install - 	git 	python' returned a non-zero code: 1

VonC Over a year ago

@Ela OK, I have edited the answer accordingly, adding the parameters -yq and -yqq which should allow you to be in non-interactive mode.

Ela Over a year ago

This worked, the -yq for update is unnecessary. Moreover, this can also be achieved by install -y --force-yes, you can update your answer if you want to include that. I don't know which way is more desirable

Lorenzo Vitali · Accepted Answer · 2018-11-22 09:25:28Z

1

You are installing python3 and then you use the executable of python, I had the same issue and I have resolved using python3.

Try changing your last line of your Dockerfile :

instead of CMD ["python", "file.py", "-h"]

try : CMD ["python3", "file.py", "-h"]

answered Nov 22, 2018 at 9:25

Lorenzo Vitali

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