Davy wrote:
> Hi Matimus and Boris,
>
> Thank you :)
>
> And a further question about vector above rank 1, how can I use it as
> the key of dictionary?
>
> For example, if I have list like L=[[1,2,3],[4,5,6,7]],
> Then I do L_tuple = tuple(L)
>>>> L_tuple = ([1,2,3],[4,5,6,7])
> But {L_tuple:'hello'} cause an error?
>
Yes, because your key still contains mutable elements. That should not
surprise you. If it does, please (re-)read
<URL:http://docs.python.org/tut/node7.html#SECTION007500000000000000000>
and <URL:http://docs.python.org/lib/typesmapping.html>.
maybe something like this could help:
def tupleize(non_tuple):
try:
return tuple(tupleize(thing) for thing in non_tuple)
except TypeError:
# non_tuple is not iterable
return non_tuple
/W
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