Python速成课程9-8

Question

我正在读Eric Matthes写的Python Crash Course这本书，我被困在了第9章的第8章“自己试试”上

class Priviledges():
    def __init__(self, priviledges):
        self.priviledges2 = ['can add post', 'can delete post',
                             'can ban user', 'can unban user']

    def show_priviledges(self):
        for priviledge in self.priviledges:
            print(priviledge)

class User():
    def __init__(self, first_name, last_name, username, age):
        self.first_name = first_name
        self.last_name = last_name
        self.username = username
        self.age = age

    def describe_user(self):
        print(self.first_name.title())
        print(self.last_name.title())
        print(self.username)
        print(self.age)

    def greet_user(self):
        print('Hello, ' + self.first_name.title() + ', how are you doing?')

class Admin(User):
    def __init__(self, first_name, last_name, username, age):
        super().__init__(first_name, last_name, username, age)
        self.priviledges = Priviledges()

admin = Admin('1','1','1','1')
admin.priviledges.show_priviledges()

到目前为止，我输入了以下内容，但是每次我运行它时都得到相同的错误

Traceback (most recent call last):
File "C:/Users/DedProtectr/Desktop/Chapter 9 Labs/Lab 9-8.py", line 35, in <module>
admin = Admin('1','1','1','1')
File "C:/Users/DedProtectr/Desktop/Chapter 9 Labs/Lab 9-8.py", line 33, in __init__
self.priviledges = Priviledges()
TypeError: __init__() missing 1 required positional argument: 'priviledges'

有人能帮帮我吗？我打错了什么？

Answer 1

您在类Priviledges()中留下了一个拼写错误，self.priviledges2应该是self.priviledges。

class Priviledges():
def __init__(self):
    self.priviledges2 = ['can add post', 'can delete post',
                         'can ban user', 'can unban user']

Answer 2

在类中，一旦对象作为类被调用，就会运行__init__()函数。这意味着在调用该类时，需要传递__init__函数中需要的任何参数。在你的“Privileges”类定义中，你的__init__参数不是self，privileges。但是，在Admin类定义中，调用privileges时根本不带任何参数。但是，由于看起来您甚至没有在privileges类中使用该参数，请考虑删除它。

class Priviledges():
    def __init__(self):
        self.priviledges2 = ['can add post', 'can delete post',
                             'can ban user', 'can unban user']

    def show_priviledges(self):
        for priviledge in self.priviledges:
            print(priviledge)

class User():
    def __init__(self, first_name, last_name, username, age):
        self.first_name = first_name
        self.last_name = last_name
        self.username = username
        self.age = age

    def describe_user(self):
        print(self.first_name.title())
        print(self.last_name.title())
        print(self.username)
        print(self.age)

    def greet_user(self):
        print('Hello, ' + self.first_name.title() + ', how are you doing?')

class Admin(User):
    def __init__(self, first_name, last_name, username, age):
        super().__init__(first_name, last_name, username, age)
        self.priviledges = Priviledges()

admin = Admin('1','1','1','1')
admin.priviledges.show_priviledges()