How to use list as key of dictionary?

[Wildemar Wildenburger]

Duncan Booth wrote:
> Better, just don't try passing it a recursive data structure.
> 
>>>> a = [1, 2, 3]
>>>> a[1] = a
>>>> a
> [1, [...], 3]
>>>> tupleize(a)
> 
> 
> Traceback (most recent call last):
>   File "<pyshell#5>", line 1, in <module>
>     tupleize(a)
>   File "<pyshell#1>", line 5, in tupleize
>     return tuple(tupleize(thing) for thing in non_tuple)
>   File "<pyshell#1>", line 5, in <genexpr>
>     return tuple(tupleize(thing) for thing in non_tuple)
>   File "<pyshell#1>", line 5, in tupleize
>     return tuple(tupleize(thing) for thing in non_tuple)
>   File "<pyshell#1>", line 5, in <genexpr>
>     return tuple(tupleize(thing) for thing in non_tuple)
>   File "<pyshell#1>", line 5, in tupleize
>     return tuple(tupleize(thing) for thing in non_tuple)
> ...

Your'e a fiend!

;)

/W