什么是运行 python 脚本的基本 Dockerfile/docker-compose.yml（使用特定版本的 python/包）

Question

My laptop (Macbook) pre-installed an old version of Python (2.7).

I have a couple of different python scripts task1.py and task2.py that require Python 3.7 and pip install some_handy_python_package

Several online sources say updating the system-wide version of Python on a Macbook could break some (unspecified) legacy apps.

Seems like a perfect use-case for Docker, to run some local scripts with a custom Python setup, but I do not find any online examples for this simple use case:

• Laptop hosts folder mystuff has two scripts task1.py and task2.py (plus a Dockerfile and docker-compose.yml file)
• Create a docker image with python 3.7 and whatever required packages, eg pip install some_handy_python_package
• Can run any local-hosted python scripts from inside the docker container
  • perhaps something like docker run -it --rm some-container-name THEN at a bash prompt 'inside' docker run the script(s) via python task1.py
  • or perhaps something like docker-compose run --rm console python task1.py

I assume the Dockerfile starts off something like this:

FROM python:3.7
RUN pip install some_handy_python_package

but I'm not sure what to add to either the Dockerfile or a docker-compose.yml file so I can either a) run in Docker a bash prompt that lets me run python task1.py , or b) lets me define a 'console' service that can invoke python task1.py from the command line

Answer 1

In case it helps someone else, here's a kind of basic example how to run some local-folder python scripts inside Dockerized python environment. (A better example would setup a volume share within the Dockerfile.)

cd sc2
pwd      # /Users/thisisme/sc2`  -- you use this path later, when run docker, to set a volume share

Create Dockerfile

# Dockerfile
FROM python:3.7
RUN pip install some_package

Build the container, named rp in this example:

docker build -t rp.

In the local folder, create some python scripts, for example: task1.py

# task1.py
from some_package import SomePackage
# do some stuff

In the local folder, run the script in the container by creating a app share point:

docker run --rm -v YOUR_PATH_TO_FOLDER:/app rp python /app/task1.py

Specifically:

docker run --rm -v /Users/thisisme/sc2:/app rp python /app/task1.py

And sometimes it is handy to run the python interpreter in the container while developing code:

docker run -it --rm rp1

>>> 2 + 2
4
>>>