from lib1 import Circle
from lib2 import Triangle
from lib3 import Rectangle
from operator import methodcaller

def get_area(shape, method_name = ['area', 'get_area', 'getArea']):   #'area', 'get_area', 'getArea'分别是三个图形面积的方法字符串
    for name in method_name:
        if hasattr(shape, name):                   #查看是否有这个属性 既对象是否有这个方法
            return methodcaller(name)(shape)       #(shape)传实例就会调用执行该方法


def get_area2(shape, method_name = ['area', 'get_area', 'getArea']):
    for name in method_name:
        f = getattr(shape, name, None)  #获取对象的方法，如果没有改方法就返回None
        if f:
            return f()


shape1 = Circle(1)
shape2 = Triangle(3, 4, 5)
shape3 = Rectangle(4, 6)

shape_list = [shape1, shape2, shape3]
# 获得面积列表
area_list = list(map(get_area, shape_list))
print(area_list)