from __future__ import print_function class Item(object): def __init__(self, value): self.value = value def __str__(self): return "Item " + str(self.value) def __iadd__(self, other): print("Item iadd", self, other) return Item(self.value + "+" + other.value) class Container(object): def __getitem__(self, key): print("Container getitem", key) return Item(key) def __setitem__(self, key, value): print("Container setitem", key, value) return self def __additem__(self, key, value): print("Container additem would be nice, but this is never called", key, value) return self c = Container() _ = c['key'] c['key'] = Item('other') print("---") c['key'] += Item('other')
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