準備用用tornado重寫本站，但發現import tornado.database時出錯。
代碼如下:
[root@lee ~]# python
Python 2.7.4 (default, Apr 11 2013, 17:08:33)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import tornado.web
>>> import tornado.database
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named database
>>>
網上不少教程明明寫的是這個模塊，怎么會提示找不到這個模塊呢？難道我沒有安裝MySQLdb的原因？
代碼如下:
[root@lee tornado]# python
Python 2.7.4 (default, Apr 11 2013, 17:08:33)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import MySQLdb
>>>
MySQLdb模塊已經裝好了，看來不是MySQLdb模塊引起的。我又重裝了一次tornado，結果還是沒有database模塊。

Python的模塊就是一個py文件，我倒tornado目錄去看了看，果然沒有database.py這個模塊：
代碼如下:
[root@lee ~]# find /usr -name tornado
/usr/lib/python2.6/site-packages/tornado-3.0.1-py2.6.egg/tornado
/usr/local/lib/python2.7/site-packages/tornado-3.0.1-py2.7.egg/tornado
/usr/local/lib/python2.7/site-packages/tornado
[root@lee ~]# cd /usr/local/lib/python2.7/site-packages/tornado
[root@lee tornado]# ls
auth.py              escape.pyc      __init__.pyc  netutil.pyc            tcpserver.py   web.pyc
auth.pyc             gen.py          ioloop.py     options.py             tcpserver.pyc  websocket.py
autoreload.py        gen.pyc         ioloop.pyc    options.pyc            template.py    websocket.pyc
autoreload.pyc       httpclient.py   iostream.py   platform               template.pyc   wsgi.py
ca-certificates.crt  httpclient.pyc  iostream.pyc  process.py             test           wsgi.pyc
concurrent.py        httpserver.py   locale.py     process.pyc            testing.py