python协程用法实例分析

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()