面向对象基础python

1. 定义一个类描述平面上的点并提供移动点和计算到另一个点距离的方法。

import math
class dian:
    def __init__(self, x_0=1, y_0=1):
        self.x = x_0
        self.y = y_0
    def distance(self):
        m = self.x ** 2
        n = self.y ** 2
        return math.sqrt(m + n)
d1 = dian()
print("该点到原点的距离为：", d1.distance())
d2 = dian(5, 6)
print("该点到原点的距离为：", d2.distance())

2. 定义一个类描述数字时钟

from time import sleep
class Clock(object):
    def __init__(self, shi=0,fen=0, miao=0):
        self._shi = shi
        self._fen = fen
        self._miao = miao

    def run(self):
        self._miao += 1
        if self._miao == 60:
            self._miao= 0
            self._fen += 1
            if self._fen == 60:
                self._fen = 0
                self._shi += 1
                if self._shi == 24:
                    self._shi = 0

    def show(self):
                return '%02d:%02d:%02d' % 
               (self._shi, self._fen, self._miao)


def main():
    clock = Clock(00, 00, 00)
    while True:
        print(clock.show())
        sleep(0.01)
        clock.run()


if __name__ == '__main__':
    main()