Adding paths to sys.path permanently, and another problem...

Jeff Shannon jeff at
Thu Dec 16 22:16:57 CET 2004

Lenard Lindstrom wrote:

>Amir Dekel <adekel at> writes:
>>Hi everyone,
>>I have two problems:
>>1. How can I keep my changes in sys.path after closing the interpreter?
>Saving sys.path changes between interpreter runs would be more involved.
>On Windows Python loads the initial module search path from the registry.
>Python's registry entries are made during installation and are left alone
>afterwards. Changing these entries is probably not a good idea. But
>if you need sys.path persistence I can try writing an example that does
>it automatically using the atexit module and a history file.

Not only can one modify the environment variable PYTHONPATH, but one can 
also use a .pth file.  Under windows, when the interpreter starts up it 
will search its default sys.path for any files with extension .pth; if 
it finds any, then it will use each line of those files as a directory 
to add to sys.path.  Thus, if you drop a mymodule.pth file in 
site-packages, which contains a list of the directories you're 
interested in, sys.path will automatically be amended for you every time 
Python starts.

Jeff Shannon
Credit International

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