python学习笔记6.9-通过字符串访问类的方法

import math

class Point:
    def __init__(self,x,y):
        self.x = x
        self.y = y

    def __repr__(self):
        return 'Point({!r:},{!r:}'.format(self.x, self.y)

    def distance(self,x,y):
        return math.hypot(self.x-x, self.y-y)

p = Point(2, 3)

d = getattr(p, 'distance')(0, 0)

import operator
d = operator.methodcaller('distance', 0, 0)(p)
print(d)

points = [Point(12,5),Point(3,4),Point(6,9)]
print(points)

points.sort(key=operator.methodcaller('distance',0,0))
print(points)