I am using centos linux.
I had python 2.6 with django and now i upgraded to python 2.7.
Python 2.6 is located in /usr/lib/python2.6.
Python 2.7 is located i
To check your path, you can use the following code:
import sys
print(sys.path)
If you already know where django is installed, it should be easy to test if the desired directory is in your path with directory in sys.path.
Regarding where your PYTHONPATH is defined, note that it's an environment variable, so you can check its value (if defined) with: echo $PYTHONPATH