如何从另一个 class 引用实例化属性

Question

我想在另一个 class 中使用实例属性（在本例中为用户的名字，"Juan"）以将其用作打印其所有权限的提示。

我所做的解决方案是删除代码行中的"self.first_name"。所以而不是

print("Since your an admin," + self.first_name + ", you have the following privileges: ")

现在变成了

print("Since your an admin, you have the following privileges: ")

这仍然可以，但没有引用实例属性。

问题是我如何才能放弃在提示中包含 "Juan" 的最初想法？我应该实施哪些更改才能使用该行代码？

# Snippet of the Code
class Privileges:
    """Make a Privilege Object for each specific user"""
    def __init__(self):
        """Initialize the privileges attributes"""
        self.privileges = ["can delete posts", "can ban user", "can add post"]

    def show_privileges(self):
        """Print all the privileges of the admin"""
        print("Since your an admin," + self.first_name + ", you have the following privileges: ")
        for privilege in self.privileges:
            print("You " + privilege + ".")


class Admin(User):
    """Make an Admin User and Inherit attributes from class "User" """
    def __init__(self, first_name,  last_name, age, gender):
        super().__init__(first_name, last_name, age, gender)
        self.privileges = Privileges()


user_1 = Admin("juan", "dela cruz", 5, "male")
user_1.privileges.show_privileges()

============================================= =========================== 预期输出是：

Since your an admin, Juan, You have the following privileges: 
You can delete posts.
You can ban user.
You can add post.

错误信息：

    print("Since your an admin," + self.first_name + ", you have the following privileges: ")
    AttributeError: 'Privileges' object has no attribute 'first_name'

Answer 1

无法直接添加父对象的名称，因为可能存在对同一权限的多个引用。您需要将用户名传递给权限实例。

您可以在构造函数中执行此操作，这会将权限绑定到单个用户。另一种方法是将名称传递给 show_privileges。这是更通用的方法，尽管它确实需要更多的输入，因为您每次都必须通过它。

Answer 2

非常感谢您的回答！ :D 最近刚开始使用 python

# Corrected Code
class Privileges:
    """Make a Privilege Class"""
    def __init__(self, first_name):
        """Initialize the privileges attributes"""
        self.privileges = ["can delete posts", "can ban user", "can add post"]
        self.first_name = first_name # 2. Added this line as well

    def show_privileges(self):
        """Print all the privileges of the admin"""
        print("Since your an admin, " + self.first_name + ", you have the following privileges: ")
        for privilege in self.privileges:
            print("You " + privilege + ".")


class Admin(User):
    """Make an Admin User and Inherit attributes from class "User" """
    def __init__(self, first_name,  last_name, age, gender):
        super().__init__(first_name, last_name, age, gender)
        self.privileges = Privileges(self.first_name)  # 1. Passed the value of the first name here


user_1 = Admin("Juan", "dela cruz", 33, "male")
user_1.privileges.show_privileges()

如何从另一个 class 引用实例化属性

How to refer an instanced attribute from another class

attributes

class

instance

python-3.x