Dictionary keys (again) (was Re: lambda)

[David Eppstein]

In article <mailman.893.1106130899.22381.python-list at python.org>,
 Nick Coghlan <ncoghlan at iinet.net.au> wrote:

> For a 'mutable key' to make sense, the following:
> 
> lst = []
> dct = {l: "Hi!"}
> print dct[[]]
> print dct[lst]
> lst.append(1)
> print dct[[1]]
> print dct[lst]
> 
> Should print:
> Hi
> Hi
> Hi
> Hi

Yes, and what should the following do?

lst1 = [1]
lst2 = [2]
dct = {lst1: "1", lst2: "2"}
lst2[0]=1
lst1[0]=2
print dct[[1]]
print dct[[2]]

-- 
David Eppstein
Computer Science Dept., Univ. of California, Irvine
http://www.ics.uci.edu/~eppstein/