strange side effect with lists!?

[Michael Hoffman]

Wolfgang.Stoecher at profactor.at wrote:
> 
>>>>l1 = [1] # define list
>>>>l2 = l1  # copy of l1 ?

Nope, l2 is l1:

 >>> l2 is l1
True

The same happens for any mutable object.

If you want to just do a surface-level copy of l1, you can use l1[:]. 
But if any of the items in l1 are mutable objects, you probably want to 
use copy.deepcopy().
-- 
Michael Hoffman