Question

我动态地将新值添加到字典中。当我调用它时，我希望它能够加载最近添加的值。

class Elements():
    def __init__(self, length):
        self.dict = {}
        self.length = length
        self.init_dict()

    def init_dict(self):
        self.dict[0] = self.length
        return self.dict[0]

    def dict_update(self):
        self.dict.update({1: self.dict[0] + 1})
        return self.dict

Elements(100)
print Elements(100).dict
print Elements(100).dict_update()
print Elements(100).dict

返回： {0: 100}, {0: 100, 1: 101}, {0: 100}

而我期待 {0: 100}, {0: 100, 1: 101}, {0: 100, 1: 101}

Answer 1

让我解释一下：

Elements(100) # New element created.
print Elements(100).dict # Print dict from a new element created.
print Elements(100).dict_update() # Print what is returned from dict_update from a new element created. In this case, the dict is updated as well.
print Elements(100).dict # Print dict from a new element created. So this object is not related to the old updated one.

因此，您要从新创建的dict对象中打印Element值，并且它与您更新的对象无关。

要解决此问题，您只需要引用1个对象。

ele = Elements(100)
print ele.dict
print ele.dict_update()
print ele.dict

Answer 2

试试这个：

class Elements():
    def __init__(self, length):
        self.dict = {}
        self.length = length
        self.init_dict()

    def init_dict(self):
        self.dict[0] = self.length
        return self.dict[0]

    def dict_update(self):
        self.dict.update({1: self.dict[0] + 1})
        return self.dict

E = Elements(100)
print E.dict
print E.dict_update()
print E.dict

Python，更新作为类属性的initianlized字典

2 个答案: