Python 如果不满足条件，如何从返回并删除对象

我想要一个在满足特定条件时不创建对象的类

class MyClass:
    def __init__(self, input):
        if input == condition:
          # get out of here and destroy this object to save memory
        self.var1 = input;
        # etc...

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满足条件后，对象将被销毁

我建议提出一个例外

class BadInitArgs(Exception):
    pass

class MyClass:
    def __init__(self, input):
        if input != "expected":
          raise BadInitArgs
          # get out of here and destroy this object to save memor
        # etc...

a = MyClass("expected")
b = MyClass("unexpected")

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为什么不在创建条件之前检查它？