How do I reduce a python (docker) image size using a multi-stage build?

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ok so my solution is using wheel, it lets us compile on first image, create wheel files for all dependencies and install them in the second image, without installing the compilers

FROM python:2.7-alpine as base

RUN mkdir /svc
COPY . /svc
WORKDIR /svc

RUN apk add --update \
    postgresql-dev \
    gcc \
    musl-dev \
    linux-headers

RUN pip install wheel && pip wheel . --wheel-dir=/svc/wheels

FROM python:2.7-alpine

COPY --from=base /svc /svc

WORKDIR /svc

RUN pip install --no-index --find-links=/svc/wheels -r requirements.txt

You can see my answer regarding this in the following blog post

https://www.blogfoobar.com/post/2018/02/10/python-and-docker-multistage-build

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