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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