python继承

import math
#class Point

class Point:
    def __init__(self, xValue, yValue):
        self.X = xValue
        self.Y = yValue


#class Circle
class Circle(Point):
    def __init__(self, xValue, yValue, rValue):
        Point.__init__(self, xValue, yValue)
        self.Radious = rValue

    def area(self):
        return math.pi * self.Radious ** 2



#driver
print("Point bases:", Point.__bases__)
print("Circle bases:", Circle.__bases__)

print("Circle is the subclass of Point:", issubclass(Circle, Point))
print("Point is the subclass of Circle:", issubclass(Point, Circle))

point = Point(3, 4)
circle = Circle(4, 5, 2)

print("point is an instace of Point:", isinstance(point, Point))
print("circle is an instace of Point:", isinstance(circle, Point))

print("point members:", point.__dict__)
print("circle members:", circle.__dict__)

print("the area if circle is:", circle.area())