有两种类型的回调函数：复制代码 代码如下:blocking callbacks (also known as synchronous callbacks or just callbacks)deferred callbacks (also known as asynchronous callbacks)
那么，在python中如何实现回调函数呢，看代码：
复制代码 代码如下:def my_callback(input): print “function my_callback was ca
回调函数用起来比较爽。特别是在js中，满世界全是回调，那么在python中，怎么来优雅地实现自己的回调函数呢
下面贴一个我写的例子
class BaseHandler(object):
def crawl(self, url, **kwargs):
if kwargs.get('callback'):
callback = kwargs['callback']
if isinstance(callback, basestring) and hasattr(s
