PyMongo奇怪错误&quot；TypeError：&#39；数据库&#39；对象不可调用。&qot；-Python问题

PyMongo Strange Error quot;TypeError: #39;Database#39; object is not callable.quot;(PyMongo奇怪错误quot；TypeError：#39；数据库#39；对象不可调用。qot；)

本文介绍了PyMongo奇怪错误&quot；TypeError：&#39；数据库&#39；对象不可调用。&qot；的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我收到一个奇怪的错误。

来源： __init__.py

import os
import base64
import uuid

import tornado.web
import tornado.httpserver
import tornado.locale
import tornado.ioloop
import tornado.options

from tornado.options import define, options

from pymongo.connection import Connection
from pymongo.database import Database

from handlers import api
#from auth import AuthLoginHandler
#from auth import AuthLogoutHandler
#from auth import AuthFirstRunHandler
from handlers import home

## Options
define("listen_port",       default = 7456, type = "int", 
                help = "bind to port")

define("listen_address",    default = None, type = "string",
                help = "bind to address")

define("static_path",       default = os.path.join(os.path.dirname(__file__), "static"), type = "string",
                help = "directory to store static resource")

# http://www.v2ex.com/t/12646
define("cookie_secret",     default = base64.b64encode(uuid.uuid4().bytes + uuid.uuid4().bytes), type = "string",
                help = "cookie")

define("mongo_host",        default = "127.0.0.1", type = "string",
                help = "hostname or ip of mongo host")

define("mongo_port",        default = 27017, type = "int",
                help = "port of mongo host")

define("mongo_collection",  default = "meowth", type = "string",
                help = "collection name")

tornado.options.parse_command_line()

class Application(tornado.web.Application):
    def __init__(self):
        tornado.web.Application.__init__(self, [
            (r"/i", home.HomeHandler),
        #   (r"/auth/login", AuthLoginHandler),
        #   (r"/auth/logout", AuthLogoutHandler),
        #   (r"/auth/install", AuthFirstRunHandler),
        #   (r"/backstage", BackstageHomeHandler),
            (r"/api/cluster", api.APIHandler),
            (r"/api/user", api.APIHandler),
            (r"/api/connection", api.APIHandler),
            (r"/api/control", api.APIHandler),
            (r"/static/(.*)", tornado.web.StaticFileHandler, { "path" : options.static_path })
        ],** dict(
            xsrf_cookies = True,
            cookie_secret = options.cookie_secret
        ))

        # init database connection
        self.mongo = Database(
            Connection(
                options.mongo_host,
                options.mongo_port
            ),
            options.mongo_collection
        )
        #self.mongo = self.mongoConnection[options.mongo_collection]
        #self.mongo = self.mongoConnection.meowth

def main():
    if options.listen_address == None:
        tornado.httpserver.HTTPServer(Application()).listen(options.listen_port)
    else:
        tornado.httpserver.HTTPServer(Application()).listen(options.listen_port, address = options.listen_address)

    tornado.ioloop.IOLoop.instance().start()

if __name__ == "__main__":
    main()

base.py

# -*- coding: utf8 -*-
import tornado.web
import pymongo

class BaseHandler(tornado.web.RequestHandler):

    def __init__(self, application, request, **kwargs):
        tornado.web.RequestHandler.__init__(self, application, request, **kwargs)
        self.session_id = self.get_secure_cookie("meowth_session")
        self.session = {}

    @property
    def db(self):
        print self.application.mongo
        return self.application.mongo

    def init_session(self):
        if not self.session_id:
            self.session_id = self.db().meowth_sessions.save(
                {"data" : self.session}
            )
        else:
            self.session = self.db().meowth_sessions.find_one(
                {"_id" : self.session_id}
            )

    def flush_session(self):
        self.db().meowth_sessions.save(
                {"data" : self.session,
                 "_id"  : self.session_id
                }
            )

    def is_spider(self):
        # https://bitbucket.org/keakon/doodle/src/3ddf46ac59e7/zh-CN/common.py#cl-512
        user_agent = self.request.headers["User-Agent"]
        if 'bot' in user_agent or 'spider' in user_agent:
            return True
        return False

错误：

> [root@CloudK02 Meowth]# ./Meowth-Web Database(Connection('127.0.0.1',
> 27017), u'meowth') [E 120219 15:07:54 web:1031] Uncaught exception GET
> /i (122.94.31.186)
>     HTTPRequest(protocol='http', host='us1.loli.vg:7456', method='GET', uri='/i', version='HTTP/1.1', remote_ip='122.94.31.186',
> body='', headers={'Accept-Language': 'en-US,en;q=0.8',
> 'Accept-Encoding': 'gzip,deflate,sdch', 'Host': 'us1.loli.vg:7456',
> 'Accept':
> 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
> 'User-Agent': 'Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.11 (KHTML,
> like Gecko) Chrome/17.0.963.56 Safari/535.11', 'Accept-Charset':
> 'ISO-8859-1,utf-8;q=0.7,*;q=0.3', 'Connection': 'keep-alive',
> 'Cookie': 'PHPSESSID=rm4ght6ivop9a1hf5oogcft3j4;
> session_id="MzZkODNiMWMyZjczOWZhNzcxYjU4YTNjNzVhZjA4Yzc=|1329674350|2562f7ed871c1ca3e24dcb5891d6e753cfacfa44";
> rock_format=json', 'Cache-Control': 'max-age=0'})
>     Traceback (most recent call last):
>       File "/usr/local/lib/python2.6/site-packages/tornado/web.py", line 988, in _execute
>         getattr(self, self.request.method.lower())(*args, **kwargs)
>       File "/home/aveline/Meowth/web/handlers/home.py", line 7, in get
>         self.init_session()
>       File "/home/aveline/Meowth/web/handlers/base.py", line 19, in init_session
>         self.session_id = self.db().meowth_sessions.save(
>       File "build/bdist.linux-x86_64/egg/pymongo/database.py", line 696, in __call__
>         "failing because no such method exists." % self.__name)
>     TypeError: 'Database' object is not callable. If you meant to call the 'meowth' method on a 'Connection' object it is failing because no
> such method exists.

如果我在类中使用self.mongo，则运行良好应用程序。但是如果我在类BaseHandler中使用它，则会出错。

为什么？