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pcp-python(1)


NAME

   pcp-python - run a python script using a preferred python variant

SYNOPSIS

   pcp python [SCRIPT [ARG]...]

DESCRIPTION

   pcp-python has been replaced by pmpython(1) which is preferred, however
   pcp-python is still installed to provided backwards compatibility.

   pcp-python provides a way to run python scripts  using  a  customisable
   python  binary,  rather than embedding any 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.
   Thus, it is common for PCP python scripts to use a "shebang" line  that
   invokes pcp-python as follows:

      #!/usr/bin/pcp python

   This  allows  the custom setting to be injected instead of a hard-coded
   python version, while still allowing the user to  override  the  python
   version as follows:

      $ PCP_PYTHON_PROG=python3 /usr/bin/pcp python --version
      Python 3.3.2
      $ PCP_PYTHON_PROG=python2 /usr/bin/pcp python --version
      Python 2.7.5

   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).

   By  default,  the  value  of PCP_PYTHON_PROG from /etc/pcp.conf will be
   used.  The  default  value  of  this  configuration  parameter  is  set
   depending  on  some  heuristics about the target build platform.  These
   heuristics favour the use of python3 in all recent releases of PCP, for
   those platforms that support it.

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

   pcp(1) and PCPIntro(1).



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