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1. Add the new Python path instance to your environment:

   export PYTHON_ROOT=${LCLS_ROOT}/package/python/python2.7.13/linux-x86_64



2. Add the new Python binaries to the PATH environment variable:
   

   export PATH=${QT_HOME}/bin:${ORACLE_HOME}/bin:${PYTHON_ROOT}/bin:${PATH}

3. Add the new Python libraries and their dependencies (EPICS 64-bit, Matlab, etc.) to the LD_LIBRARY_PATH environment variable. This is to ensure that the new 64-bit versions of Python modules built against those dependencies will work:
   

   export LD_LIBRARY_PATH=${LCLS_ROOT}/matlab/2016b/extern/lib:${EPICS_BASE_RELEASE}/lib/linux-x86_64: ${EPICS_EXTENSIONS}/lib/linux-x86_64:${EPICS_BASE_TOP}/base-cpp-R4 -6-0/lib/linux-x86_64:${PYTHON_ROOT}/lib:${PYTHON_ROOT}/build/Python2.7.13/Lib:${LD_LIBRARY_PATH}



4. Clear the PYTHONPATH environment variable. This is to ensure that there are no false positives when testing applications, since PYTHONPATH may still have access to older versions of Python modules:
   
   export PYTHONPATH=

5. [Optional] If your application(s) import the "cx_Oracle" module, add/change the following in your environment:

   export ORACLE_HOME= ${LCLS_ROOT} /package/oracle/product/ 11 . 2 . 0 . 2 .0_x86_64/client_1export PATH=${ORACLE_HOME}/bin:${PATH}

   export LD_LIBRARY_PATH=${ORACLE_HOME}/lib:${LD_LIBRARY_PATH}



6. [Optional] If your application(s) import "PyQt", "PyQwt", or any other Python modules that depend on Qt, add/change the following in your environment:

   export QT_HOME=${LCLS_ROOT}/package/Qt/Qt-4.8.6/linux-x86_64

   export PATH=${QT_HOME}/bin:${PATH}

   export LD_LIBRARY_PATH=${QT_HOME}/lib:${LD_LIBRARY_PATH}



Method 2

If you would like to use the full Python 2.7.13 64-bit environment and all of its dependencies, source the following setup script, which does all of the steps in Method 1, including the optional ones:

source /usr/local/lcls/tools/script/go_python2.7.13.bash



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After testing, it may be discovered that certain applications may not run with Python 2.7.13 64-bit due to unresolved dependencies (e.g., 32-bit Python modules, Matlab2016b, Qt5, etc.) or other reasons. If such dependencies cannot currently be resolved, Python developers may invoke the following environment settings in a wrapper script or similar to launch the application using the older instance of Python instead:

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:
3. Add the old Python libraries and their dependencies to your environment: