anchor.diff:      # # Remove APT files
       && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
   
  -RUN pip3 install cython
  -
   COPY --from=builder /usr/local /usr/local
  +
  +RUN pip3 --no-cache-dir install cython ipython
   
   WORKDIR /src
   
  
positive.code: 
  ENV PYTHONPATH /usr/local/lib/python:/src/unwise_psf/py:/src/legacypipe/py
  ENV WISE_PSF_DIR /src/unwise_psf/etc
  
  RUN pip3 install --no-cache-dir ipython
  
  ENV HOME /root
  
  
negative.code:            /usr/local/lib/python /usr/local/lib/python3.5/site-packages \
             /usr/local/lib/python3.5/dist-packages
  
  RUN pip3 uninstall -y fitsio; pip3 install --no-cache-dir fitsio==0.9.12
  
  RUN cd /src/legacypipe/py && git pull && git describe
  
  RUN    python    -m compileall /src/legacypipe/py/{legacypipe,legacyzpts} \
      && python -O -m compileall /src/legacypipe/py/{legacypipe,legacyzpts}
  