example of using docker container to package a python application

README.md

$ docker build -t show .

$ docker run -v `pwd`:/data show /data/blah.txt
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blah.txt

a
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Dockerfile

FROM python:3.7

RUN mkdir -p /data
COPY p.py /p.py
RUN pip install click

WORKDIR /

ENTRYPOINT ["python", "p.py"]

p.py

import click

@click.command()
@click.argument('filename', type=click.Path(exists=True))
def show(filename):
    """Print FILENAME if the file exists."""
    with open(filename, 'rb') as f:
        for l in f:
            click.echo((l), nl=False)


if __name__ == '__main__':
    show()