[Python知识库]Python基础学习-13

Python基础学习-13

# Python 继承
# create 父类
class Person:
    def __init__(self, fname, lname):
        self.first_name = fname
        self.last_name = lname

    def print_name(self):
        print(self.first_name, self.last_name)


x = Person("猪猪侠", "GGBang")
x.print_name()


# create 子类
class child(Person):
    pass


x = child("猪猪侠", "GGBang")
x.print_name()


# 添加init函数后，子类不再继承父类的init函数
# 如果要保持父init函数的继承，添加对父函数
# 的调用__init__


class Person1:
    def __init__(self, fname, lname):
        self.first_name = fname
        self.last_name = lname

    def print_name(self):
        print(self.first_name, self.last_name)


class child1(Person):
    def __init__(self, fname, lname):
        Person1.__init__(self, fname, lname)


X = child1("小龙", "小龙人")
X.print_name()


# 可以用super()函数让子类
# 继承其父类的所有方法和属性


class Person2:
    def __init__(self, fname, lname):
        self.first_name = fname
        self.last_name = lname

    def print_name(self):
        print(self.first_name, self.last_name)


class child2(Person2):
    def __init__(self, fname, lname):
        super().__init__(fname, lname)


x = child2("小灰灰", "灰太狼")
x.print_name()


# add property
class person3:
    def __init__(self, fname, lname):
        self.first_name = fname
        self.last_name = lname

    def print_name(self):
        print(self.first_name, self.last_name)


class child3(Person):
    def __init__(self, fname, lname):
        super().__init__(fname, lname)
        self.year = 2021


x = child3("小红红", "红太郎")
print(x.year)


# add year parameter
class Person4:
    def __init__(self, fname, lname):
        self.first_name = fname
        self.last_name = lname

    def print_name(self):
        print(self.first_name, self.last_name)


class child4(Person):
    def __init__(self, fname, lname, year):
        super().__init__(fname, lname)
        self.year = year


x = child4("小羊羊", "喜羊羊", 1998)
print(x.year)


# add way
class Person5:
    def __init__(self, fname, lname):
        self.firstname = fname
        self.lastname = lname

    def print_name(self):
        print(self.firstname, self.lastname)


class child5(Person):
    def __init__(self, fname, lname, year):
        super().__init__(fname, lname)
        self.year = year

    def welcome(self):
        print("Welcome", self.first_name, self.last_name, "to the class of", self.year)


x = child5("小羊羊", "美羊羊", 2021)
x.welcome()