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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: Module: Y115
#!/usr/bin/env 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
                LANG en_US.UTF-8
                TERM xterm-color
               SHELL /bin/bash
               SHLVL 1
             SSH_TTY /dev/pts/0
              OLDPWD /home/wellho/trainee
            LESSOPEN |/usr/bin/ %s
                 PWD /home/wellho/trainee/y115
            HISTSIZE 1000
          SSH_CLIENT 53029 22
             LOGNAME wellho
                USER wellho
             INPUTRC /etc/inputrc
                PATH /usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin
                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;
                HOME /home/wellho
                   _ /usr/bin/python
      SSH_CONNECTION 53029 22

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

Books covering this topic
Yes. We have over 700 books in our library. Books covering Python are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

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.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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