network simulator in Python ?

[DanielJohnson]

I was wondering if anyblody can suggest me a network simulator written
in python in which I can add on my own code and extend its
functionality.

I am looking for a simulator which will simualte TCP, UDP, RTP and
most networking protocol. The learning curve for ns2 and other
simulator is too high for me at this time and thats why I am
considering Python for it.

Every help will be appreciated.

Thanks