del

[Daniel Silva]

>> Why would you want to undefine a variable?  More precisely, how
>> many programs would be broken if a python compiler did not
>> implement it?

> I often use it to delete items from a list or dictionary:

That's fine.  It's easy to map it to a container.remove_item equivalent.  
But would you ever write this?:

x = 3
del x


Removing items from a container in-place is ok, but I don't see the point 
of actually undefining variables.

- Daniel