gistfile1.txt

$ dpkg -l |grep iotop
ii  iotop                             0.4.4-4                             simple top-like I/O monitor

(test-iotop)$ python
Python 2.7.3 (default, Dec 18 2014, 19:10:20) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import iotop
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named iotop
>>> 

$ deactivate 

$ python
Python 2.7.3 (default, Dec 18 2014, 19:10:20) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import iotop
>>> iotop
<module 'iotop' from '/usr/lib/python2.7/dist-packages/iotop/__init__.pyc'>
>>> 
KeyboardInterrupt
>>>