anchor.diff:      apt-get -y install \
       git \
       nginx \
  -	python3 \
  -    python3-setuptools \
       postgresql \
       postgresql-contrib \
       libpq-dev \
  
positive.code:     mkdir /tmp/setup
  COPY setup/requirements.txt /tmp/setup/requirements.txt
  COPY requirements.txt /tmp/requirements.txt
  RUN pip3 install -r /tmp/requirements.txt && \
      rm /tmp/requirements.txt && \
      rm -rf /tmp/setup && \
      update-rc.d -f postgresql remove && \
      update-rc.d -f nginx remove && \
      mkdir -p /home/app && \
  
negative.code: # Sal Dockerfile
  FROM python:3.6.6-jessie
  
  MAINTAINER Graham Gilbert <graham@grahamgilbert.com>
  
  