>>> class Thing(object): ... def __index__(self): ... return 1 ... >>> thing = Thing() >>> list_ = ['abc', 'def', 'ghi'] >>> list_[thing] 'def' >>> dict_ = {1: 'potato'} >>> dict_[thing] # KeyError How does thing know to represent itself as 1 when accessed by a list, but not by a dict? Don't both magic methods go through __getitem__? The usage shown for lists could go through __int__ instead so what is the raison d'être for __index__ anyway? Continue reading...
