changing the List's behaviour?

[meinrad recheis]

hi pythoneers

i am very annoyed by the List's index out of bouds exception
it forces me to complicate my code by adding length checking

i might be spoilt by Ruby which returns nil for not existing indices.
i want to change the List so that it returns None if the index for 
accesssing list elements
is out of bound.

i am not very experienced in python, so i ask you for suggestions.

thanks in advance,
	Meinrad Recheis