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Using CentOS5, I have Apache configured with the following directives.

Alias /pscript/ /var/www/pscript/
<Directory "/var/www/pscript/">
    Options +ExecCGI
    AddHandler cgi-script .py

When I call then my python script runs and prints out my sys.path, which is displaying python2.4.

When I call a different script that requires Python 2.5, I get a 500 Internal Server Error.

Looking at my Apache error_log, I see the following line:

[Wed Mar 03 16:58:44 2010] [error] [client] Please use Python 2.5 or greater

From the command line, running python -V returns Python 2.5.5. I have both 2.4 and 2.5.5 installed, but only 2.5.5 should be in use.

In an attempt to remedy the Apache problem I recompiled Python 2.5.5 to be safe, and made sure to enable shared library. Then I recompiled mod_python in case that was affecting something, but my sys.path is still python2.4.

I wonder, do I need to recompile Apache 2.2.3 itself? I simply need Apache to utilize Python 2.5.5.

Edit: It appears both of my python installations have shared libraries. Obviously the 2.4 version predates 2.5. Would this be a possible cause?

Thanks in advance.

share|improve this question
Found a solution for this? I'm facing this same issue. – SHOUBHIK BOSE Aug 27 '13 at 15:08

The apache process is most likely running as a different user and might be picking up a different system path to your own user.

Perhaps, assuming your apache user is www-data, running the following command will confirm it:

sudo su www-data python -V
share|improve this answer
The user is different, I confirmed the one that was declared in the httpd.conf file. Using "su" to login as that user, I ran "python -V" and it printed "Python 2.5.5" – Structure Mar 3 '10 at 9:23
up vote 0 down vote accepted

Within my python script /usr/bin/env was being used to call Python. This was calling the wrong version. Not sure how to make it call a different version, but changing my scripts to /usr/bin/local/python (Python 2.5.5 installation) corrected the problem.

share|improve this answer
You'd set/adjust the sys.path environment variable (for the user the script runs as) to pick up your desired Python version. Alternatively, you could take a look at virtualenv. – dwightgunning Mar 4 '10 at 10:13
Is there a preferred way to modify sys.path to accomplish this? I will also look into virtualenv. – Structure Mar 5 '10 at 1:46

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