anchor.diff:      sudo \
       locales \
       git \
  -    vim \
  -    jed \
       emacs \
  -    build-essential \
       python-dev \
       unzip \
       libsm6 \
  
positive.code: 
  # Install Jupyter notebook as NB_USER
  RUN conda install --quiet --yes \
      'notebook=4.2*' \
      && conda clean -tipsy
  
  # Install JupyterHub to get the jupyterhub-singleuser startup script
  RUN pip --no-cache-dir install 'jupyterhub==0.5'
  
  USER root
  
  
negative.code: 
  # Add any extra requirements. Done at end to avoid cache busting.
  ADD requirements.txt requirements.txt
  RUN mkdir /home/$NB_USER/work/ucsl17_notebooks
  RUN git clone https://github.com/Mohitsharma44/ucsl17 /home/$NB_USER/work/ucsl17_notebooks
  
  USER $NB_USER
  