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<!DOCTYPE HTML>
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<title>责任链模式 · GitBook</title>
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<h1 id="python设计模式之责任链模式"><a href="http://dongweiming.github.io/python-chain.html"Permalink to python设计模式之责任链模式"" target="_blank">python设计模式之责任链模式</a></h1><h2 id="责任链模式">责任链模式</h2><p>比如我们还在读书的时候，考试的分数都是几个档次，比如90-100分，80-90分，好吧我想做一个根据分数打印你的学习成绩的反馈，
比如90-100就是A+，80-90就是A，70-80就是B+… 当然你可以用很多种方法实现，我这里就来实现一个Chain模式:用一系列的类来响应，
但只有遇到适合处理它的类才会处理，类似与case和switch的作用</p><h2 id="python的例子">python的例子</h2><pre><code>class BaseHandler:
# 它起到了链的作用
def successor(self, successor):
self.successor = successor
class ScoreHandler1(BaseHandler):
def handle(self, request):
if request > 90 and request <= 100:
return "A+"
else:
# 否则传给下一个链，下同，但是我是要return回结果的
return self.successor.handle(request)
class ScoreHandler2(BaseHandler):
def handle(self, request):
if request > 80 and request <= 90:
return "A"
else:
return self.successor.handle(request)
class ScoreHandler3(BaseHandler):
def handle(self, request):
if request > 70 and request <= 80:
return "B+"
else:
return "unsatisfactory result"
class Client:
def __init__(self):
h1 = ScoreHandler1()
h2 = ScoreHandler2()
h3 = ScoreHandler3()
# 注意这个顺序，h3包含一个类似于default结果的东西，是要放在最后的，其他的顺序是无所谓的，比如h1和h2
h1.successor(h2)
h2.successor(h3)
requests = {'zhangsan': 78,
'lisi': 98,
'wangwu': 82,
'zhaoliu': 60}
for name, score in requests.iteritems():
print '{} is {}'.format(name, h1.handle(score))
if __name__== "__main__":
client = Client()</code></pre>
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