"import mapnik" is not same in different folders

[Enkuushka]

After I have run both of the following code

sudo python setup.py develop
sudo python setup.py install

and it seems like installing and finishes without errors.

And when I go inside demo directory it is not working and giving the following error.

And please note that import mapnik is working without errors in the main directory of the project.

and as a consequence mapnik is not found when running

/etc/TileStache/scripts/tilestache-server.py

I guess. What to do?