⚠️ 换写法之前，先证明两边等价

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多态版和 if/elif 版各算一遍三个形状的面积，然后对拍。

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← 🔴 加一个新形状，两种写法各要改几处 ⚠️ 漏实现的那个，当场就该炸 →

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class Shape:
    """只承诺一件事：能算面积"""
    def area(self):
        raise NotImplementedError

def name(self):
        raise NotImplementedError

class Rect(Shape):
    def __init__(self, w, h):
        self.w, self.h = w, h

def area(self):
        return self.w * self.h

def name(self):
        return "长方形"

class Square(Shape):
    def __init__(self, s):
        self.s = s

def area(self):
        return self.s ** 2

def name(self):
        return "正方形"

class Tri(Shape):
    def __init__(self, b, h):
        self.b, self.h = b, h

def area(self):
        return self.b * self.h // 2

def name(self):
        return "三角形"

SHAPES = [Rect(3, 4), Square(5), Tri(6, 5)]

def area_of(s):
    if s["kind"] == "rect":
        return s["w"] * s["h"]
    elif s["kind"] == "square":
        return s["side"] ** 2
    elif s["kind"] == "tri":
        return s["base"] * s["height"] // 2
    return 0

def name_of(s):
    if s["kind"] == "rect":
        return "长方形"
    elif s["kind"] == "square":
        return "正方形"
    elif s["kind"] == "tri":
        return "三角形"
    return "?"

def sides_of(s):
    if s["kind"] == "rect":
        return 4
    elif s["kind"] == "square":
        return 4
    elif s["kind"] == "tri":
        return 3
    return 0

DICTS = [{"kind": "rect", "w": 3, "h": 4},
         {"kind": "square", "side": 5},
         {"kind": "tri", "base": 6, "height": 5}]

# TODO: 两种写法各算一遍三个形状的面积，结果必须完全一样
a = []
b = []
# TODO: 一致输出「一致」，否则「不一致」
verdict = "不一致"

print("/".join(str(x) for x in a) + "/" + verdict)

本次输入：

输出：

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