python 协程
#! coding=utf-8
#-------------------------------------------------------------------------------
# Name: 协程
# Purpose:
#
# Author: jack
#
# Created: 30/03/2013
# Copyright: (c) jack 2013
# Licence: <your licence>
#-------------------------------------------------------------------------------
'''
把函数编写为一个任务，从而能处理发送给他的一系列输入，这种函数称为协程
'''
def print_matchs(matchtext):
print "looking for",matchtext
while True:
line = (yield) #用 yield语句并以表达式（yield)的形式创建协程
if matchtext in line:
print line
'''
>>> matcher = print_matchs('python')
>>> matcher.next()
looking for python
>>> matcher.send('hello python') #看生成器那片，关于send()跟next()的区别
hello python
>>> matcher.send('test')
>>> matcher.send('python is cool')
python is cool
>>>matcher.close()
'''
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