pmpython(1)

NAME

   pmpython - run a python script using a preferred python variant

SYNOPSIS

   pmpython [python-args-and-script]

DESCRIPTION

   pmpython  provides  a  way  to  run python scripts using a customisable
   python interpreter, rather than embedding  the  name  of  a  particular
   version of python into each script.

   This  can  be useful as it allows version-independent python code to be
   run anywhere.  All python modules shipped with PCP support versions 2.6
   and  later  (in  the python2 series), and 3.3 and later (in the python3
   release series).

   Due to python monitoring and collecting scripts being relatively simple
   in PCP (not requiring new modules, language features, etc), it has been
   possible to ensure they work for all of the above python versions.

   However, the name of the python interpreter is  not  always  the  same,
   thus,  it is common for PCP python scripts to use a "shebang" line that
   launches the python interpreter indirectly as follows:

      #!/usr/bin/env pmpython

   env(1) is used to find the correct path  for  the  pmpython  executable
   from the user's $PATH.

   By  default  the  name  of the python interpreter is found from the the
   value of $PCP_PYTHON_PROG from  the  environment  (if  set)  else  from
   /etc/pcp.conf.  The latter is the more typical case where this value is
   based on some heuristics  about  the  platform  at  the  time  the  PCP
   packages  were  build  and  favour  the  use  of  python3 in all recent
   releases of PCP (for those platforms that support it).

   This allows an appropriate name to be used for the  python  interpreter
   instead  of  a hard-coded python version name, while still allowing the
   user to override the python interpreter as follows:

      $ PCP_PYTHON_PROG=python3 pmpython --version
      Python 3.4.2
      $ PCP_PYTHON_PROG=python2 pmpython --version
      Python 2.7.9

   This  is  convenient  for  shipping  identical  scripts   on   multiple
   platforms,  and  for  testing  different  python  versions with the one
   script (e.g.  in  the  case  where  multiple  versions  of  python  are
   installed,  PCP_PYTHON_PROG  can  be  set  in  the local environment to
   override the global setting).

   pmpython is a replacement for an earlier tool  with  similar  function,
   namely pcp-python(1).

PCP ENVIRONMENT

   Environment variables with the prefix PCP_ are used to parameterize the
   file and directory names used by PCP.  On each installation,  the  file
   /etc/pcp.conf  contains  the  local  values  for  these variables.  The
   $PCP_CONF variable may be used to specify an alternative  configuration
   file, as described in pcp.conf(5).

SEE ALSO

   env(1), pcp(1), pcp-python(1) and PCPIntro(1).

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