从西雅图直飞波士顿需要几个小时（包括时差）

class Point(object): def __init__(self,x=0,y=0): self._x=x self._y=y @property def x(self): return self._x @x.setter def x(self, value): self._x = value @property def y(self): return self._y @y.setter def y(self, value): self._y = value def distance(p1,p2): return((p1.x-p2.x)**2+(p1.y-p2.y)**2)**0.5 def isnearby(self,p): return((self.x-p2.x)**2+(self.y-p2.y)**2)**0.5 def __str__(self): return '('+str(self.x)+','+str(self.y)+')'#测试p1=Point() #不写x,y默认为0print(str(p1))print(p1.x,p1.y)p1.x=3p1.y=4print(str(p1))p2=Point(4,5)print(Point.distance(p1,p2)) #p1,p2两点间距离print(p1.isnearby(p2)) #p1到p2的距离

http://matrix.itasoftware.com/cvg/
自己查查吧

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