$ docker pull aleccunningham/pipenv:3.6-onbuild
This dockerfile is structured to be used as a base image for a python 3.6 application. When paired with your application, it should look similar to the following.
FROM aleccunningham/pipenv:3.6-onbuild
COPY . /app
RUN python3 main.py
Making use of the ONBUILD command allows for docker to automagically add and install dependencies defined in a Pipfile.