python 3.x - Circular dependency in the class constructor -



python 3.x - Circular dependency in the class constructor -

i have next class:

class customdictionary(dict): def __init__(self, val, *args, **kwargs): self.wk = val super(dict, self).__init__() def __setattr__(self, key, value): if key in self.wk: raise exception("wrong key", "") key = key.replace(" ", "_") self.__dict__[key] = value def main(): wrong_keys = ("r23", "fwfew", "s43t") dictionary = customdictionary(wrong_keys) dictionary["a1"] = 1

as can see, create attribute wk in constructor. have __setattr__ function, in work attribute wk. however, customdictionary object has no attribute wk.

__setattr__ pain way, because called every assignment instance member. easiest prepare situation define empty wk before __init__:

class customdictionary(dict): wk = [] def __init__(self, val, *args, **kwargs): self.wk = val ...

python-3.x constructor circular-dependency

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