How can I install python packages in Docker?

Question

I am trying to run a model written in Python and packaged in Docker. The model is available here: https://github.com/pennsignals/chime_sims

The model has a requirements.txt file and a number of python files. Requirements file is supposed to install a number of python packages, including configargparse. The docker file runs, but when it gets to the python code that uses configargparse, I get an error that such a package does not exist.

I added a line that I think should install it:

RUN pip -m install --upgrade configargparse

and then I import it in the python code. But I still get an error stating that no such package exits.

Here is the Docker code:

FROM continuumio/miniconda3
WORKDIR /chime_sims
RUN conda update -yq -n base -c defaults conda

RUN conda create -yq -n chime_sims python=3.7 pip pandas matplotlib scipy numpy seaborn
COPY ./requirements.txt .
FROM python
RUN python -m pip install --upgrade pip
RUN pip -m install --upgrade configargparse
RUN pip freeze > requirements.txt .

RUN py -m pip install -r requirements.txt

And here is the list from requirements.txt: ConfigArgParse configargparse gitpython seaborn numpy pandas gvar lsqfit

I suspect I'll have problems installing gvar and lsqfit if I ever get configargparse to work. I had trouble installing those packages outside of docker, but it finally worked.

Any ideas on how I can fix it? thank you, i.