lists and tuples

[Gerrit Holl]

John Hunter wrote:
>     Gerrit> I don't understand. I really don't understand.
> 
> For me, the most important distinction is that because lists are
> mutable, they cannot be used as keys in a dictionary.

This is probably a basic question, but I can't see why mutable
objects can't be used as dictionairy keys. Why would this be
impossible:

  0 >>> d = {}
  1 >>> l = []
  2 >>> d[l] = "foo"
  3 >>> d
{[]: 'foo'}
  4 >>> l.append("bar")
  5 >>> l
['bar']
  6 >>> d
{['bar']: 'foo'}

What is the problem of doing this?

yours,
Gerrit.

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