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1. Add the new Python instance to your environment:

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

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

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   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:

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   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:

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   export PYTHONPATH=

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

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   export 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 Qt4 64-bit, add the following to your environment:

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   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}

   
   If your application uses Qt5 64-bit, add the following to your environment (needs updated gcc and glibc):

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   export PATH=${LCLS_ROOT}/package/gcc/gcc-4.9.4/bin:${PATH} export LD_LIBRARY_PATH=${LCLS_ROOT}/package/gcc/gcc-4.9.4${LD_LIBRARY_PATH} export LD_LIBRARY_PATH=/usr/local/lcls/package/gcc/gcc-4.9.4/lib64:$LD_LIBRARY_PATH   export QT_HOME=${LCLS_ROOT}/package/Qt/Qt-5.9.1/linux-x86_64 export PATH=${QT_HOME}/bin:${PATH} export LD_LIBRARY_PATH=${QT_HOME}/lib:${LD_LIBRARY_PATH}

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