如何在 Dockerfile 中添加 PYTHONPATH 的路径
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How do you add a path to PYTHONPATH in a Dockerfile
提问by arcoxia tom
How do you add a path to PYTHONPATH in a Dockerfile? So that when the container is run it has the correct PYTHONPATH? I'm completly new to docker.
如何在 Dockerfile 中添加 PYTHONPATH 的路径？那么当容器运行时它有正确的 PYTHONPATH 吗？我对 docker 完全陌生。
I've added ENV PYTHONPATH "${PYTONPATH}:/control"to the Dockerfile as I want to add the directory /controlto PYTHONPATH.
我已添加ENV PYTHONPATH "${PYTONPATH}:/control"到 Dockerfile，因为我想将目录添加/control到PYTHONPATH.
When I access the containers bash with docker exec -it trusting_spence bashand open python and run the commands below the directory controlis not on the list.
当我使用 bash 访问容器docker exec -it trusting_spence bash并打开 python 并运行目录下的命令时，该目录control不在列表中。
import sys
print(sys.path)
import sys
print(sys.path)
FROM python:2
RUN pip install requests\
&& pip install pymongo
RUN mkdir control
COPY control_file/ /control
ENV PYTHONPATH "${PYTONPATH}:/control"
CMD ["python","control/control_file/job.py"]
回答by Erik Cederstrand
Just add an ENVentry in your Dockerfile:
只需ENV在您的Dockerfile:
ENV PYTHONPATH "${PYTHONPATH}:/your/custom/path"
Or set PYTHONPATHin your startup script.
或者PYTHONPATH在您的启动脚本中设置。
回答by Nimrod Morag
You're setting the python path correctly, but your command is not being run by a shell, so the environment variable PYTHONPATHis not considered.
您正确设置了 python 路径，但是您的命令不是由 shell 运行的，因此PYTHONPATH不考虑环境变量。
chang your CMDfrom "exec" form to "shell" form:
将您CMD的“exec”形式更改为“shell”形式：
CMD python control/control_file/job.py
CMD python control/control_file/job.py
From the Docs:
从文档：
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 $HOME" ]. When using the exec form and executing a shell directly, as in the case for the shell form, it is the shell that is doing the environment variable expansion, not docker.
注意：与 shell 形式不同，exec 形式不调用命令 shell。这意味着不会发生正常的 shell 处理。例如， CMD [ "echo", "$HOME" ] 不会对 $HOME 进行变量替换。如果你想要 shell 处理，那么要么使用 shell 形式，要么直接执行 shell，例如：CMD [ "sh", "-c", "echo $HOME" ]。当使用 exec 形式并直接执行 shell 时，就像 shell 形式一样，是 shell 进行环境变量扩展，而不是 docker。
回答by unlockme
Do it in a much simpler way. Add the python path in your .env file as a line in this way.
以更简单的方式进行。以这种方式将 .env 文件中的 python 路径添加为一行。
PYTHONPATH=/app/project_source/
PYTHONPATH=/app/project_source/
