请教两个程序的区别

nanrenne

#coding:gbk
class User:
        def __init__(self,first_name,last_name):
                self.first_name = first_name
                self.last_name = last_name
                self.login_attempts = 0
               
               
        def describe_user(self):
                fullname = self.first_name.title()+' '+self.last_name.title()
                return fullname.title()
               
        def greet_user(self):               
                print('Hi ,are u ok ? ')
       
        def increment_login_attempts(self):
                self.login_attempts += 1
                return self.login_attempts #为什么我需要return

        def reset_login_attempts(self):
                self.login_attempts = 0
                return self.login_attempts#为什么我需要return
i = User('ng','young')
print(i.describe_user())

i.greet_user()

i.increment_login_attempts()
i.increment_login_attempts()
i.increment_login_attempts()
print(i.increment_login_attempts())

print(i.reset_login_attempts())

==============为什么下边的程序不需要return======================================
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

eric = User('eric', 'matthes', 'e_matthes', 'e_matthes@example.com', 'alaska')
eric.describe_user()
eric.greet_user()

print("\nMaking 3 login attempts...")
eric.increment_login_attempts()
eric.increment_login_attempts()
eric.increment_login_attempts()
print("  Login attempts: " + str(eric.login_attempts))

print("Resetting login attempts...")
eric.reset_login_attempts()
print("  Login attempts: " + str(eric.login_attempts))

nanrenne

看懂了,请删帖