6.multi-stage-production-python.Dockerfile

# ---- Base python ----
FROM python:3.6 AS base
# Create app directory
WORKDIR /app

# ---- Dependencies ----
FROM base AS dependencies  
COPY gunicorn_app/requirements.txt ./
# install app dependencies
RUN pip install -r requirements.txt

# ---- Copy Files/Build ----
FROM dependencies AS build  
WORKDIR /app
COPY . /app
# Build / Compile if required

# --- Release with Alpine ----
FROM python:3.6-alpine3.7 AS release  
# Create app directory
WORKDIR /app

COPY --from=dependencies /app/requirements.txt ./
COPY --from=dependencies /root/.cache /root/.cache

# Install app dependencies
RUN pip install -r requirements.txt
COPY --from=build /app/ ./
CMD ["gunicorn", "--config", "./gunicorn_app/conf/gunicorn_config.py", "gunicorn_app:app"]

@praveenweb, I have one question. What's the use of dependencies layer since you are installing the packages in the release itself?