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Python environment variables
Additional Python Facilities example from a Well House Consultants training course
More on Additional Python Facilities [link]

This example is described in the following article(s):
   • Python - what is going on around me? - [link]

Source code: penv.py Module: Y115
#!/usr/bin/python

import os

for param in os.environ.keys():
    print "%20s %s" % (param,os.environ[param])

"""

These are the standard Python environment variables ...

PYTHONHOME - Location of standard libraries
PYTHONPATH - Additions to standard search path for modules
PYTHONSTARTUP - Interactive mode; commands run before first input is prompted for
PYTHONY2K - set nonempty to require 4 year date formats
PYTHONOPTIMIZE - set nonempty causes basic optimisation. Set to 2 also discards docstrings
PYTHONDEBUG - set nonempty to turn on python debugging
PYTHONINSPECT - force interactive mode on end of normal program termination
PYTHONUNBUFFERED - turn OFF buffering of stdin, stdout and stderr
PYTHONVERBOSE - provide verbose information about module loading (set to 2 for very verbose!)
PYTHONCASEOK - Ignore case in

Added at Python 2.6
PYTHONIOENCODING - change unicode handling for stdin / stdout / stderr
PYTHONNOUSERSITE - don't add user's directory to sys.path
PYTHONUSERBASE - change the user's directory
PYTHONEXECUTABLE - Mac OS X Only. Override the program name in argv[0]

"""


"""
Sample outpout from the program above

-bash-3.2$ python penv.py
                LANG en_US.UTF-8
                TERM xterm-color
               SHELL /bin/bash
               SHLVL 1
             SSH_TTY /dev/pts/0
              OLDPWD /home/wellho/trainee
            HOSTNAME server51076.uk2net.com
            LESSOPEN |/usr/bin/lesspipe.sh %s
                 PWD /home/wellho/trainee/y115
            HISTSIZE 1000
          SSH_CLIENT 82.33.81.221 53029 22
             LOGNAME wellho
                USER wellho
             INPUTRC /etc/inputrc
                PATH /usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin
  G_BROKEN_FILENAMES 1
                MAIL /var/spool/mail/wellho
           LS_COLORS no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:bd=40;
33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:ex=01;32:*.cmd=01;32:
*.exe=01;32:*.com=01;32:*.btm=01;32:*.bat=01;32:*.sh=01;32:*.csh=01;32:
*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:
*.z=01;31:*.Z=01;31:*.gz=01;31:*.bz2=01;31:*.bz=01;31:*.tz=01;31:
*.rpm=01;31:*.cpio=01;31:*.jpg=01;35:*.gif=01;35:*.bmp=01;35:*.xbm=01;35:
*.xpm=01;35:*.png=01;35:*.tif=01;35:
                HOME /home/wellho
                   _ /usr/bin/python
      SSH_CONNECTION 82.33.81.221 53029 83.170.95.163 22
-bash-3.2$
"""


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Python
 * Python Programming
 * Intermediate Python
Also available on on site courses for larger groups

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Other Examples
This example comes from our "Additional Python Facilities" training module. You'll find a description of the topic and some other closely related examples on the "Additional Python Facilities" module index page.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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