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+####################
+# Dependancy Builder
+####################
+FROM python:3.7-stretch AS builder
+
+# Set working directory
+WORKDIR /usr/src/app
+
+# Turns off writing .pyc files; superfluous on an ephemeral container.
+ENV PYTHONDONTWRITEBYTECODE=1
+# Seems to speed things up
+ENV PYTHONUNBUFFERED=1
+
+# Use the executables from the virtualenv instead of globals
+ENV PATH="/opt/venv/bin:$PATH"
+
+# Setup virtualenv to build dependancies into
+RUN python -m venv /opt/venv
+
+# Install python dependancies
+COPY requirements.txt ./requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+#####################
+# Condensed App Image
+#####################
+
+# Smaller official Debian-based Python image
+FROM python:3.7-slim-stretch AS app
+
+# Set working directory
+WORKDIR /usr/src/app
+
+# Extra python env
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+ENV PIP_DISABLE_PIP_VERSION_CHECK=1
+ENV PATH="/opt/venv/bin:$PATH"
+
+# Setup the virtualenv
+RUN python -m venv /opt/venv
+
+# Copy in tools and python environment
+COPY --from=builder /opt/venv /opt/venv
+
+# Copy in the rest of the app
+COPY ./ /usr/src/app