在蟒蛇？为什么子类继承父类？当您使用 init of 方法分配父级时？但它不起作用

问题描述

class Person:


    @property
    def name(self):
        return self.__name

    @name.setter
    def name(self,name):
        self.__name = name


    @property
    def age(self):
        return self.__age

    @age.setter
    def age(self,age):
        self.__age = age



    def __init__(self,name,age):

        self.__name = name
        self.__age = age



        pass

    def print_info(self):

        print("my name is {} and my age is {}".format(self.__name,self.__age))

        pass

class Student(Person):

    @property
    def school_name(self):
        return self.__school_name

    @school_name.setter
    def school_name(self,school_name):
        return self.__school_name


    def __init__(self,school_name,age):
        Person.__init__(self,age)
        self.__school_name = school_name

        pass


    def print_info(self):

        print("my schoolname is {} name is {} age is {}".format(self.__school_name,self.__name,self.__age))
        print("hello")


    pass

if __name__ == '__main__':

    stu = Student("primary school","songpengfei",22)
    stu.print_info()




    pass

---

Traceback (most recent call last):
  File "<input>",line 1,in <module>
  File "/Applications/PyCharm.app/Contents/helpers/pydev/_pydev_bundle/pydev_umd.py",line 198,in runfile
    pydev_imports.execfile(filename,global_vars,local_vars)  # execute the script
  File "/Applications/PyCharm.app/Contents/helpers/pydev/_pydev_imps/_pydev_execfile.py",line 18,in execfile
    exec(compile(contents+"\n",file,'exec'),glob,loc)
  File "/Users/songpengfei/PycharmProjects/untitled1/review.py",line 69,in <module>
    stu.print_info()
  File "/Users/songpengfei/PycharmProjects/untitled1/review.py",line 60,in print_info
    print("my schoolname is {} name is {} age is {}".format(self.__school_name,self.__age))
AttributeError: 'Student' object has no attribute '_Student__name'

解决方法

简短的回答是您应该使用属性 self.name 而不是字段 self.__name。同样，您应该只在 __ 中使用以 @property 开头的名称。否则使用该属性。因此，例如，在 self.age 之外使用 self.__age 而不是 @property。