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1. Add the previous Python instance to your environment:
   
   export PYTHON_ROOT=${LCLS_ROOT}/package/python/python2.7.4
   
   
2. Add the previous Python binaries to your environment:
   
   export PATH=${PYTHON_ROOT}/bin:${PATH}
   
   
3. Add the old Python libraries and their dependencies to your environment:
   
   export LD_LIBRARY_PATH=$
   
   
4. [Optional]
5. [Optional]