FW: python import sys.path

Kelly, Brian Brian.Kelly at uwsp.edu
Fri Jan 2 15:09:26 CET 2009

After following your suggestions I was able to confirm that the 2.5
interpreter was being invoked. So then I grepped for all instances of python
in the scripts that were imported as modules: from bacula_conf import *

The calling script cleanup.py is invoking purge_client.py like an external

def purgeAll(options, computer_name):
    cmd = "python purge_client.py %s" % computer_name
    if options.pretend <> True:
        error = os.system(cmd)
        _log.info("Done. No changes made due to --pretend flag.")
    if not error:
        return True
        return False

When I saw the imports I assumed the functions in purge_client.py were being
referenced from the calling scripts symbol table. However, that is not the

-----Original Message-----
From: John Machin [mailto:sjmachin at lexicon.net] 
Sent: Tuesday, December 30, 2008 4:42 PM
To: python-list at python.org
Subject: Re: python import sys.path

On Dec 31, 5:05 am, "Kelly, Brian" <Brian.Ke... at uwsp.edu> wrote:
> I have both 2.4 and 2.5 interpreters installed on a linux box. The
> PythonPath is set to :
> ckages:/prod/bacula/local/lib/python2.4/site-packages
> My main script is getting called like so:
> python2.4 cleanup.py wrkstnbs
> The imports statements in cleanup.py are as follows:
> import os,sys
> print sys.path
> from datetime import datetime
> from optparse import OptionParser        # used for parsing parameters
> from bacula_conf import *                # used for connecting to our
> databases, etc.
> from registration_cleanup \
>     import RegistrationCleanup           # used for interacting w/
> registration db (sql1)
>                                          # and configuration database
> (genunix)
> import directory_cleanup as fclean       # file cleanup.
> One of the scripts being imported from bacula_conf is called
> purge_client.py.
> It has the following imports:
> import sys
> import MySQLdb
> Everytime I run "python2.4 cleanup.py wrkstnbs" I get the following error:
> Traceback (most recent call last):

Have you snipped any traceback entries here? You say you are running
cleanup.py but the first traceback entry is from purge_client.py!!

You should first fix that, so that you've got the full story. My guess
is that something along that trail is invoking another instance of the
Python interpreter and somehow that instance is 2.5, not 2.4. I can't
imagine how those 2.5-related entries would otherwise get into

Suggestions: (1) where you are debug-printing sys.path, also print
sys.version and sys.argv[0] ... and do debug-printing at more places
between start and error.
(2) run "python2.4 -vv cleanup.py wrkstnbs" and look for the first
mention of 2.5 (indicating something has manipulated sys.path), or
sudden cessation of -vv output (indicating a new instance of python is
running without -vv), or some other phenomenon ...

>   File "purge_client.py", line 22, in <module>
>     import MySQLdb
>   File
> "/prod/bacula/local/lib64/python2.4/site-packages/MySQLdb/__init__.py",
> 27, in <module>
>     import _mysql
> ImportError: /prod/bacula/local/lib64/python2.4/site-packages/_mysql.so:
> undefined symbol: Py_InitModule4

What happens when you run python2.4 and at the interactive prompt do
>>> import _mysql
? Is there a possibility that you installed 2.5 MySQLdb into the 2.4
hierarchy? [could be a stupid question from a windows guy; this may be
a non-problem on linux]

Is this the first thing that you've tried after installing 2.5, or the
only problem found in an exhaustive regression test of all your apps
using 2.4, or somewhere in the middle?

[big snip]


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