Asun Friere wrote:
On Aug 12, 12:15 pm, James Stroud <jstr...@mbi.ucla.edu> wrote:

I realize I left out my use. The intent of the function is to flag
objects that will make useful keys for a persistent dictionary. The
{C():4}[C()] example demonstrates why I want to avoid certain types of
keys--I don't want users to do things like {C():4, C():4}, which python
happily allows but falls apart at the level of persistence.

What am I missing here?  How, in terms of persistence, is {C():4, C():
4} conceptually different from {'spam':4, 'ham':4}?

You should be more imaginative.
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