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How do you add a path to PYTHONPATH in a Dockerfile

Hello Guys, How are you all? Hope You all Are Fine. Today We Are Going To learn about How do you add a path to PYTHONPATH in a Dockerfile in Python. So Here I am Explain to you all the possible Methods here.

Without wasting your time, Let’s start This Article.

Table of Contents

How do you add a path to PYTHONPATH in a Dockerfile?

  1. How do you add a path to PYTHONPATH in a Dockerfile?

    You're setting the python path correctly, but your command is not being run by a shell, so the environment variable PYTHONPATH is not considered.

  2. you add a path to PYTHONPATH in a Dockerfile

    You're setting the python path correctly, but your command is not being run by a shell, so the environment variable PYTHONPATH is not considered.

Method 1

Just add an ENV entry in your Dockerfile:

ENV PYTHONPATH "${PYTHONPATH}:/your/custom/path"

Or set PYTHONPATH in your startup script.

Method 2

You’re setting the python path correctly, but your command is not being run by a shell, so the environment variable PYTHONPATH is not considered.

chang your CMD from “exec” form to “shell” form:

CMD python control/control_file/job.py


From the Docs:

Note: Unlike the shell form, the exec form does not invoke a command shell. This means that normal shell processing does not happen. For example, CMD [ “echo”, “$HOME” ] will not do variable substitution on $HOME. If you want shell processing then either use the shell form or execute a shell directly, for example: CMD [ “sh”, “-c”, “echo $HOME” ]. When using the exec form and executing a shell directly, as in the case for the shell form, it is the shell that is doing the environment variable expansion, not docker.

Summery

It’s all About this issue. Hope all Methods helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which Method worked for you? Thank You.

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