41 lines
769 B
Python
41 lines
769 B
Python
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#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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"""
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Topic: 通过字符串调用方法
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Desc :
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"""
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import math
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class Point:
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def __init__(self, x, y):
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self.x = x
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self.y = y
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def __repr__(self):
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# !r表示调用后面参数的__repr__()方法
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return 'Point({!r:},{!r:})'.format(self.x, self.y)
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def distance(self, x, y):
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return math.hypot(self.x - x, self.y - y)
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p = Point(2, 3)
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d = getattr(p, 'distance')(0, 0) # Calls p.distance(0, 0)
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import operator
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operator.methodcaller('distance', 0, 0)(p)
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points = [
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Point(1, 2),
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Point(3, 0),
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Point(10, -3),
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Point(-5, -7),
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Point(-1, 8),
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Point(3, 2)
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]
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# Sort by distance from origin (0, 0)
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points.sort(key=operator.methodcaller('distance', 0, 0))
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