Python command not working while building python docker file

Question

I need to run a python command while building a docker image. My docker file is as follows

FROM python:3.8.13-slim-buster
RUN /usr/local/bin/python3 -c "import yaml"

When I run docker build . -t hello, I get the following error:

Sending build context to Docker daemon  2.048kB
Step 1/2 : FROM python:3.8.13-slim-buster
---> 289f4e681a96
Step 2/2 : RUN /usr/local/bin/python3 -c "import yaml"
---> Running in 4eb13a1a1e9a
Traceback (most recent call last):
File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'yaml'

You need to install the yaml module in your container before that command runs. — jordanm
– jordanm, Commented Aug 18, 2022 at 13:47
You might won't to run pip earlier to install your dependencies. — Klaus D.
– Klaus D., Commented Aug 18, 2022 at 13:47
1: pray the container has pip installed. 2: RUN /usr/local/bin/python3 -m pip install pyyaml first — DownloadPizza
– DownloadPizza, Commented Aug 18, 2022 at 13:47
@DownloadPizza Why not pray for a fully working Docker image with your code directly? — Klaus D.
– Klaus D., Commented Aug 18, 2022 at 13:48

Daniel Walker · Accepted Answer · 2022-08-18 13:51:15Z

1

You need to install the pyyaml package also. You can modify your Dockerfile as below:

FROM python:3.8.13-slim-buster
RUN /usr/local/bin/pip3 install PyYAML
RUN /usr/local/bin/python3 -c "import yaml"

edited Aug 18, 2022 at 13:51

Daniel Walker

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answered Aug 18, 2022 at 13:50

Vikrant Srivastava

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Comments

Daniel Walker · Accepted Answer · 2022-08-18 13:49:15Z

1

The yaml module is not a part of Python's standard library. You'll need to install it with

RUN python3 -m pip install pyyaml

edited Aug 18, 2022 at 13:49

answered Aug 18, 2022 at 13:47

Daniel Walker

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3 Comments

DownloadPizza Over a year ago

This requires that 1: python2 pip is not installed and 2: that pip is on the path. /usr/local/bin/python3 -m pip ... is the safer bet

Daniel Walker Over a year ago

Is the full path necessary?

DownloadPizza Over a year ago

Depends how much you trust the container authors to not mess things up. But in a python container python should generally be on the path so probably fine without full path

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