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GitHub Repository: jackfrued/Python-100-Days
 Path: blob/master/Day01-15/code/Day09/triangle.py
Views: 729
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"""

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实例方法和类方法的应用

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Version: 0.1

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Author: 骆昊

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Date: 2018-03-12

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"""

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from math import sqrt

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class Triangle(object):

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    def __init__(self, a, b, c):

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        self._a = a

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        self._b = b

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        self._c = c

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    # 静态方法

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    @staticmethod

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    def is_valid(a, b, c):

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        return a + b > c and b + c > a and c + a > b

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    # 实例方法

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    def perimeter(self):

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        return self._a + self._b + self._c

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    # 实例方法

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    def area(self):

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        p = self.perimeter() / 2

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        return sqrt(p * (p - self._a) * (p - self._b) * (p - self._c))

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if __name__ == '__main__':

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    # 用字符串的split方法将字符串拆分成一个列表

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    # 再通过map函数对列表中的每个字符串进行映射处理成小数

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    a, b, c = map(float, input('请输入三条边: ').split())

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    # 先判断给定长度的三条边能否构成三角形

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    # 如果能才创建三角形对象

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    if Triangle.is_valid(a, b, c):

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        tri = Triangle(a, b, c)

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        print('周长:', tri.perimeter())

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        print('面积:', tri.area())

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        # 如果传入对象作为方法参数也可以通过类调用实例方法

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        # print('周长:', Triangle.perimeter(tri))

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        # print('面积:', Triangle.area(tri))

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        # 看看下面的代码就知道其实二者本质上是一致的

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        # print(type(tri.perimeter))

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        # print(type(Triangle.perimeter))

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    else:

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        print('不能构成三角形.')

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