python example dockerfile for linux

dockerfile

#from alpine:latest as base
from python:3.7.3-alpine as base

from base as builder

RUN apk add --no-cache python3 python3-dev py-pip build-base

# create directory to copy files to
RUN mkdir /install/
WORKDIR /install

# copy the files that should have come from git
copy requirements.txt requirements.txt

# go ahead and install the python modules that also came from git
RUN pip install --install-option="--prefix=/install" -r requirements.txt

FROM base

copy --from=builder /install /usr/local
RUN mkdir /app/

COPY numpyTest.py /app/numpyTest.py


# create a simple python script
#RUN echo print("Hello World from python from a container!") > c:\hello.py

# establish what command will run when the docker run command is executed
CMD ["python", "/app/numpyTest.py"]

numpyTest.py

import numpy as np
print ("start")
a = np.arange(15).reshape(3,5)
print (a)
print ("Done")

requirements.txt

numpy