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Module `posix' defines the following data item:

`environ'
     A dictionary representing the string environment at the time the
     interpreter was started. For example, `environ['HOME']' is the
     pathname of your home directory, equivalent to `getenv("HOME")' in
     C.

     Modifying this dictionary does not affect the string environment
     passed on by `execv()', `popen()' or `system()'; if you need to
     change the environment, pass `environ' to `execve()' or add
     variable assignments and export statements to the command string
     for `system()' or `popen()'.

     *Note:* The `os' module provides an alternate implementation of
     `environ' which updates the environment on modification.  Note
     also that updating `os.environ' will render this dictionary
     obsolete.  Use of the `os' for this is recommended over direct
     access to the `posix' module.

Additional contents of this module should only be accessed via the `os'
module; refer to the documentation for that module for further
information.