写点类，再写直线类，算两点间的距离

import mathclass Point:    def __init__(self,x=0,y=0):        self.x=x        self.y=yclass Line(Point):    def getLen(self,p1,p2):        r=math.sqrt(((p1.x-p2.x)**2)+(p1.y-p2.y)**2)        return rp1=Point(1,1)p2=Point(4,5)l=Line()hh=l.getLen(p1,p2)print(hh)