Python 断言属性集

Question

是否可以在属性更改时断言它(出于调试目的)？

class MyClass(object):
    def set_my_property(self, value):
        self.my_property = value
        # TODO: mark my_property so that if it gets set again, an assert
        # is triggered

c = MyClass()
c.set_my_property(4)

# any of these lines would cause an assertion
c.set_my_property(8)
c.my_property = 123

Answer 1

编辑:这是你要找的吗？

class MyClass(object):
    def __init__(self):
        self.trigger = False
        self._my_property = 0

    def set_my_property(self, value):
        if self.trigger:
            raise Exception("WHOOPS!")
        self._my_property = value
        # TODO: mark my_property so that if it gets set again, an assert
        # is triggered
        self.trigger = True

    def get_my_property(self):
        return self._my_property

    my_property = property(get_my_property, set_my_property, None)

c = MyClass()
c.set_my_property(4)

# any of these lines would cause an assertion
c.set_my_property(8)
c.my_property = 123