[Python] Python doesn't see installed module entity.rfc3413.oneliner

thank you in advance for help.

Here is an issue, I use module pysnmp with pyasn1, I am using this example to get started, and getting an error:

# python snmp.py
Traceback (most recent call last):
File "snmp.py", line 1, in <module>
from pysnmp.entity.rfc3413.oneliner import cmdgen
File "/home/user_name/rrd_poller/pysnmp.py", line 5, in <module>
ImportError: No module named **entity.rfc3413.oneliner**


Other question is why it refers to entity.rfc3413.oneliner but not to pysnmp.entity.rfc3413.oneliner . Also, I checked

/usr/local/lib/python2.7/site-packages/pysnmp/entity/rfc3413/oneliner/__init__.py


These server has two versions of python installed one is in /usr/bin/ other in /opt, When I do:

which python


I get:

/opt/python/python/Python-2.7.5/python # which is correct location


Modules are installed:

#python -c "help ('modules')"


Gives:

pysnmp and pyasn1

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