anchor.diff:      sudo \
       locales \
       git \
  -    vim \
  -    jed \
       emacs \
  -    build-essential \
       python-dev \
       unzip \
       libsm6 \
  
positive.code: 
  # Add any extra requirements. Done at end to avoid cache busting.
  ADD requirements.txt requirements.txt
  RUN pip install -r requirements.txt
  RUN pip3 install -r requirements.txt
  
  USER $NB_USER
  
negative.code: # Remove pyqt and qt pulled in for matplotlib since we're only ever going to
  # use notebook-friendly backends in these images
  RUN conda create --quiet --yes -p $CONDA_DIR/envs/python2 python=2.7 \
      'cython' \
      'numpy' \
      'pillow' \
  