Question

我有这个：

def required(props):
    props.fget.required = True
    return props

class SomeClass():
    @required
    @property
    def func(self):
         return self.conname("conname")

但是我想要这样：当SomeClass的self.name属性等于“value”时，当需要非等等假时，使属性可选。

Answer 1

您可以在初始化程序中处理此问题，如下所示：

class SomeClass(object): # inherit from object if you are using python 2.7
    def __init__(self, name, optional_required_property=None):
        self.name = name
        if name == "value" and optional_required_property is None:
            raise AttributeError("optional_required_property cannot be None.")
        else:
            self.optional_required_property = optional_required_property
test_someclass = SomeClass("test") # will work
test_someclass = SomeClass("value") # will fail

受Stack Overflow Question: How to implement a required property in Python启发

根据条件设置可选/必需属性

1 个答案: