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    <p>Here is a <a href="http://www.dabeaz.com/coroutines/coroutine.py" rel="noreferrer">basic example of a coroutine</a>:</p> <pre><code>def coroutine(func): def start(*args,**kwargs): cr = func(*args,**kwargs) cr.next() return cr return start @coroutine def grep(pattern): print "Looking for %s" % pattern while True: line = (yield) if pattern in line: print(line) g = grep("python") # Notice how you don't need a next() call here g.send("Yeah, but no, but yeah, but no") g.send("A series of tubes") g.send("python generators rock!") # Looking for python # python generators rock! </code></pre> <p>We can make a class which contains such a coroutine, and delegates calls to its <code>send</code> method to the coroutine:</p> <pre><code>class Foo(object): def __init__(self,pattern): self.count=1 self.pattern=pattern self.grep=self._grep() @coroutine def _grep(self): while True: line = (yield) if self.pattern in line: print(self.count, line) self.count+=1 def send(self,arg): self.grep.send(arg) foo = Foo("python") foo.send("Yeah, but no, but yeah, but no") foo.send("A series of tubes") foo.send("python generators rock!") foo.pattern='spam' foo.send("Some cheese?") foo.send("More spam?") # (1, 'python generators rock!') # (2, 'More spam?') </code></pre> <p>Notice that <code>foo</code> acts like a coroutine (insofar as it has a send method), but is a class -- it can have attributes and methods which can interact with the coroutine.</p> <p>For more information (and wonderful examples), see David Beazley's <a href="http://www.dabeaz.com/coroutines/index.html" rel="noreferrer">Curious Course on Coroutines and Concurrency.</a></p>
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    1. COi had read beazley's 'curious course', and was trying to implement some of what I learned there when i asked this question. Thanks for showing the def send() , i wasnt sure if that was the approach to take or not..
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