52 lines
1.4 KiB
Python
52 lines
1.4 KiB
Python
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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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