anchor.diff:              tar \
               vim \
               nodejs \
  +            gcc \
               locales
   
   RUN echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && \
  
positive.code: 
  RUN apt-get update --yes
  RUN apt-get install --yes \
              python3.6 \
              python3.6-venv \
              python3.6-dev \
  
negative.code: 
  RUN pip install --no-cache-dir jupyterhub==0.9.2
  
  # Install nbzip
  RUN jupyter serverextension enable  --sys-prefix --py nbzip && \
      jupyter nbextension     install --sys-prefix --py nbzip && \
  