How to run your first Python script in Docker?

Please follow steps below.

1. Pull the `python` docker image from Docker hub

$ docker pull python

It will download the offical python docker image from Docker hub, which will be used as the base image to build your own image. And you can run docker images to check after the download is finished.

2. Test this image by checking the Python version (optional)

$ docker run --rm python python --version
Python 3.6.5

With the --rm option, the containter will be removed automatically after it exits.

3. Prepare your Python script

$ mkdir hello-docker
$ cd hello-docker

$ cat hello.py
import sys

name=sys.argv[1]
print(f"Hello, {name}!")

4. Edit your Dockerfile

$ cat Dockerfile
FROM python
RUN mkdir /app
COPY ./hello.py /app
ENTRYPOINT ["python", "/app/hello.py"]
CMD ["world"]

Notes:

An “ENTRYPOINT” allows you to configure a container that will run as an executable.
“CMD” should be used as a way of defining default arguments for an “ENTRYPOINT” command.

5. Build the image

$ docker build -t hello-docker .

6. Run your first Python script in Docker

$ docker run --rm hello-docker
Hello, world!
$ docker run --rm hello-docker docker
Hello, docker!

1. Pull the python docker image from Docker hub