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• From an internet-accessible machine, download the latest Python 2.7.x source tarball (https://www.python.org/downloads/source/)

• Create the Python installation directory structure in LCLS production: $PACKAGE_TOP/python/python<version> (e.g., $PACKAGE_TOP/python/python2.7.13),
  which should look as follows:

  Code Block
  language bash theme Midnight
  $ ls /usr/local/lcls/package/python/python2.7.13/linux-x86_64 bin include lib man share src

• Transfer the Python source tarball to $PACKAGE_TOP/python/python<version>/src:
  

  Code Block
  language bash theme Midnight
  $ ls /usr/local/lcls/package/python/python2.7.13/linux-x86_64/src Python-2.7.13.tgz

• Configure the build with the following options:

  Anchor
  bootstrap_pip bootstrap_pip

  Info
  --prefix=$PACKAGE_TOP/python/python2.7.13/linux-x86_64 (To create all build directories under the current structure) --enable-shared (To allow building of shared libraries [.so files], required for packages such as PyQt) --with-ensurepip=upgrade (To bootstrap the latest pip installer for Python 2.7.x >= 2.7.9)

  Code Block
  language bash theme Midnight
  $ ./configure --prefix=$PACKAGE_TOP/python/python2.7.13/linux-x86_64 --enable-shared --with-ensurepip=upgrade $ make $ make install

• Set the environment to use the newly-installed Python instance (example uses a script):

  Code Block
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  $ cat goinit_python2.7.13.bash #!/bin/bash # Sets the user environment to use Python2.7.13 if [ -d /afs/slac/g/lcls ]; then export LCLS_ROOT=/afs/slac/g/lcls else export LCLS_ROOT=/usr/local/lcls fi export ORACLE_HOME=${LCLS_ROOT}/package/oracle/product/11.2.0.2.0_4/linux-x86_64/client_1 export QT_HOME=${LCLS_ROOT}/package/Qt/Qt-45.89.61/linux-x86_64 export PYTHON_ROOT=${LCLS_ROOT}/package/python/python2.7.13/linux-x86_64 export PATH=${QT_HOME}/bin:${ORACLE_HOME}/bin:${PYTHON_ROOT}/bin:${PATH} export LD_LIBRARY_PATH=${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:${QT_HOME}/lib:${ORACLE_HOME}/lib:${PYTHON_ROOT}/lib:${PYTHON_ROOT}/build/Python2.7.13/Lib:${LD_LIBRARY_PATH} $ source goinit_python2.7.13.bash

  
  

• Check that the core installation includes pip and setuptools (required for building Python modules from source):

  Code Block
  language bash theme Midnight
  $ pip list pip (9.0.1) setuptools (28.8.0)

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