query regarding OOP functionality in python

[Vardhman Jain]

Hi,
    I tried searching a bit about this on the net, but couldn't get much 
help, so I am posting it here.
Could someone tell me, what kind of polymorphisms does python allows?  
Does it allow multiple functions with same name and different 
arguments?  Does it allow multiple functions with same name but 
different return types. I have tried this with constructors and failed, 
So I suppose I might need to compile the code or something like that to 
gain this feature if it exists.

I know it allows default values to function arguments but that is not 
sufficient for my purpose.