bottle.py中的路由搜索优化

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# Now search regexp routes # ROUTES_REGEXP是一个字典，键是请求方法，值是[路由, 处理函数]的列表 # 例如：{"GET", [[路由1, 处理函数1], [路由2, 处理函数2]]} routes = ROUTES_REGEXP.get(method,[]) for i in xrange(len(routes)):     match = routes[i][0].match(url)     if match:         handler = routes[i][1]         if i > 0 and OPTIMIZER and random.random() <= 0.001:           # Every 1000 requests, we swap the matching route with its predecessor.           # Frequently used routes will slowly wander up the list.           # 有千分之一的概率，可以与前面的路由互换位置，这样使用越频繁的路由就会           # 被换的越靠前，搜索起来效率就越高           routes[i-1], routes[i] = routes[i], routes[i-1]         return handler, match.groupdict() raise HTTPError(404, "Not found")