dictionary with complex keys

[Aahz Maruch]

In article <393D54B6.EAF70234 at magellan.umontreal.ca>,
Stefan Seefeld  <seefelds at magellan.umontreal.ca> wrote:
>
>I'm trying to create a dictionary with the keys being lists.  How can I
>do that ? The docs say that only simple types are possible as keys. Is
>there a way to achieve what I want ? May be some special operator I
>need to define...

Use tuples instead of lists.  The restriction isn't so much on "simple"
types as "immutable" types -- dict keys must be constants.
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