使用 self.setattr() 时如何不弄乱 self.dict 代

Question

我正在尝试实现特殊行为，以便 self 和 self.aux_gate 中的值始终相同。我尝试通过实施 __setattr__() 来做到这一点，但在这样做的过程中，我运行遇到了许多关于 __dict__.

的问题

据我所知，似乎每当正常调用 self.__setattr__() 时，它都会向 self.__dict__ 添加一个键值对，对应于给定的参数 self.__setattr__()。

但是，我写的 self.__setattr__() 似乎创建了额外的 self.__dict__ 条目，我见过 self.__dict__["conditional"]、self.__dict__["current_Position"] 和 self.__dict__["current_Track"] .我不明白这些价值观是如何进入 self.__dict__.

的

这是class，我把它超级class复制粘贴到下面

class SWAP_Gate(Quantum_Gate):
    
    def __init__(self, cost, conditional, current_Track, current_Position, rectangle = None, aux_gate = None):
        if aux_gate is None:
            self.aux_gate = SWAP_Gate(cost,conditional,current_Track,current_Position, aux_gate = self)
        else:
            self.aux_gate = aux_gate
        self.cost = cost
        self.__SWAPconditional = conditional
        self.__SWAPcurrent_Track = current_Track
        self.__SWAPcurrent_Position = current_Position
        if rectangle is None:
            self.rectangle = pg.Rect(430, 0, 1480, 150)
        else:
            self.rectangle = rectangle
    
    def __setattr__(self, name, value):
        super(SWAP_Gate, self).__setattr__(name, value)
        if name == "conditional":
            self.aux_gate.conditional = value
        #I've deleted some code on this line that jsut made the whole post a lot harder to read, it's not relevant to my problem
        elif name == "current_Position":
            self.current_Position = value
            self.aux_gate.current_Position = value
        elif name == "aux_gate":
            self.__dict__["aux_gate"] == value
        else:
            self.__dict__[name] == value
    
    def __getattr__(self, name):
        if name == "conditional":
            return self.__SWAPconditional
        elif name == "current_Track":
            return self.__SWAPcurrent_Track
        elif name == "current_Position":
            return self.__SWAPcurrent_Position

class Quantum_Gate():
        
    def __init__(self, cost, conditional, current_Track, current_Position, rectangle = None):
        self.cost = cost
        self.conditional = conditional
        self.current_Track = current_Track
        self.current_Position = current_Position
        if rectangle is None:
            self.rectangle = pg.Rect(0, 0, 100, 100)
        else:
            self.rectangle = rectangle```

Answer 1

我看到的主要是 __setattr__ 函数中的第一条语句是

super(SWAP_Gate, self).__setattr__(name, value)

除了您在 __setattr__ 中的任何其他代码之外，此语句将导致默认 setattr 行为发生，因此预计随时会在 __dict__ 中看到“current_Track”current_Track 已设置（除非超级 class 到 SWAP_Gate 阻止了 setattr 的默认行为）。

如果您不希望出现默认行为，请删除 __setattr__ 顶部的 super() 语句，并在最后的 else 语句中用它替换 self.__dict__ 语句：

def __setattr__(self, name, value):
        # Removed super() statement from here
        if name == "conditional":
            self.aux_gate.conditional = value
        elif name == "current_Track":
            if self.current_Track:
        #...
        elif name == "aux_gate":
            self.__dict__["aux_gate"] == value
        else:
            #replaced self.__dict__[name]=value with super() statement:
            super(SWAP_Gate, self).__setattr__(name, value)

使用 self.setattr() 时如何不弄乱 self.dict 代

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使用 self.setattr() 时如何不弄乱 self.dict 代

How to not mess up self.dict generation when using self.setattr()