Jp Calderone <[EMAIL PROTECTED]> wrote:
> Dictionaries support mutable keys just find. What they don't
>support is unhashable keys.
>
> For some objects, this is an important distinction: lists are
>mutable but not hashable.
Of course, you could subclass list to make a mutable, hashable list:
class HashableList (list):
def __hash__ (self):
return sum (self)
myList = HashableList ((1, 2, 3))
d = {myList: "fred"}
print d
print d [myList]
myList.append (0)
print d [myList]
myList.append (42)
try:
print d [myList]
except KeyError:
print "didn't work because the hash changed"
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