根据pymongo文档，
PyMongo is thread-safe and even provides built-in connection pooling for threaded applications.
我通常会像这样启动我的mongodb连接：
import pymongo
db = pymongo.Connection()['mydb']
然后我可以像db.users.find（{'name'：..}）一样使用它...
这是否意味着我实际上可以将这两行放在lib / apps_global.py中：
class Globals(object):
def __init__(self, config):
self.cache = CacheManager(**parse_cache_config_options(config))
import pymongo
self.db_conn = pymongo.connection()
self.db = self.db_conn['simplesite']
然后在我的基本控制器中：
class BaseController(WSGIController):
def __call__(self, environ, start_response):
"""Invoke the Controller"""
# WSGIController.__call__ dispatches to the Controller method
# the request is routed to. This routing information is
# available in environ['pylons.routes_dict']
ret = WSGIController.__call__(self, environ, start_response)
# Don't forget to release the thread for mongodb
app_globals.db_conn.end_request()
return ret
并开始在我的控制器中调用app_global的db变量？ 我希望它真的那么容易。