I run a python program and I get :

s117555@ubuntu:~/SUmb_2/sumb/python/examples$ python nk_test.py
Traceback (most recent call last):
File "nk_test.py", line 17, in <module>
import petsc4py
ImportError: No module named petsc4py

BUt I know I have petsc4py already since when I write sudo easy_install petsc4py I get the following:

s117555@ubuntu:~/SUmb_2/sumb/python/examples$ sudo easy_install petsc4py
[sudo] password for s117555:
Searching for petsc4py
Best match: petsc4py 3.3
petsc4py 3.3 is already the active version in easy-install.pth

Using /usr/local/lib/python2.7/dist-packages
Processing dependencies for petsc4py
Finished processing dependencies for petsc4py

SO I realy dont know what is going on..? WHy is is not in my python library?? is it like that or I am getting confused..