class Triangle:

    """

    三角形类

    """

    def __init__(self, width, height):

        self.width = width

        self.height = height

    def get_area(self):

        area = self.width * self.height / 2.0

        return area

class Square:

    """

    正方形类

    """

    def __init__(self, size):

        self.size = size

    def get_area(self):

        area = self.size * self.size

        return area

t1 = Triangle(3, 5)

print(t1.get_area())

s1 = Square(3)

print(s1.get_area())

class People:

    def __init__(self, name):

        self.name = name

    def talk(self):

        print("My name is {}".format(self.name))

people = People("XiaoWang")

people.talk()

class Student(People):

    pass

student = Student("XiaoWang")

student.talk()

st1 = Student("XiaoWang")

st1.talk()

"My Name is cat,3 years old"