objects as mutable dictionary keys

[Peter Maas]

John Roth schrieb:
> No. The basic answer is that it's up to the object whether
> it will allow itself to be used as a dictionary key. In other
> words, if the designer of an object thinks it makes sense
> for instances to be dictionary keys, then he can supply a
> __hash__() method. If he doesn't, then he doesn't supply
> such a method, and it won't work.

Except for classic objects which can be used as dictionary
keys without having __hash__().

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