我目前正在学习Python速成课程,学习第9章,课程。我正在解决其中一个问题,并去图书网站获得解决方案。除了一行代码外,我了解它的大部分工作原理。以下是全部代码:
class User():
"""Represent a simple user profile."""
def __init__(self, first_name, last_name, username, email, location):
"""Initialize the user."""
self.first_name = first_name.title()
self.last_name = last_name.title()
self.username = username
self.email = email
self.location = location.title()
self.login_attempts = 0
def describe_user(self):
"""Display a summary of the user's information."""
print("\n" + self.first_name + " " + self.last_name)
print(" Username: " + self.username)
print(" Email: " + self.email)
print(" Location: " + self.location)
def greet_user(self):
"""Display a personalized greeting to the user."""
print("\nWelcome back, " + self.username + "!")
def increment_login_attempts(self):
"""Increment the value of login_attempts."""
self.login_attempts += 1
def reset_login_attempts(self):
"""Reset login_attempts to 0."""
self.login_attempts = 0
class Admin(User):
"""A user with administrative privileges."""
def __init__(self, first_name, last_name, username, email, location):
"""Initialize the admin."""
super().__init__(first_name, last_name, username, email, location)
# Initialize an empty set of privileges.
self.privileges = Privileges()
class Privileges():
"""A class to store an admin's privileges."""
def __init__(self, privileges=[]):
self.privileges = privileges
def show_privileges(self):
print("\nPrivileges:")
if self.privileges:
for privilege in self.privileges:
print("- " + privilege)
else:
print("- This user has no privileges.")
eric = Admin('eric', 'matthes', 'e_matthes', 'e_matthes@example.com', 'alaska')
eric.describe_user()
eric.privileges.show_privileges()
print("\nAdding privileges...")
eric_privileges = [
'can reset passwords',
'can moderate discussions',
'can suspend accounts',
]
eric.privileges.privileges = eric_privileges
eric.privileges.show_privileges()
我不清楚的是eric.privileges.privileges = eric_privileges
行。我知道它指向的是包含列表的eric\u特权。但问题是什么埃里克。特权。特权部分?我想埃里克。特权是自我保护特权. 但是第二个呢?特权?你知道吗
我也有这本书,不过是关于第八章的。尽管有评论,我还是会尽力解释代码的。你知道吗
eric
,是管理员class
的object
,它inherits
来自用户。每个管理员都有一组特权,即包含list
的class
。你知道吗此代码:
调用位于
admin
类中的privileges(eric毕竟是Admin的object
),它是Admin类的一个属性。你知道吗此代码:
在第一个特权之后,正在访问特权
class
中的list
,他被分配了一个list
。你知道吗将对privileges的第二次调用看作是从Admin访问privileges类中的privileges列表的网关。这本书可能不想更深入地讨论,但作者可以用
_
将它们声明为private,并在Admin类中放置一个setter。你知道吗相关问题 更多 >
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