在windows下使用
easy_installpsycopg2安装psycopg2时安装成功，但在python中import psycopg2时却提示如下错误：
from psycopg2._psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
ImportError: DLL load failed: 找不到指定的模块。
为何？？
ImportError: DLL load failed: The specified module could not be found. the file _psycopg.pyd is a dll. For its relatively small size it is probably dynamically linked to the libpq.dll. I think the system either fails to find libpq.dll or some of the other dependencies (they are listed in the setup.py).I suggest you to use a tool to check its dll dependencies (maybe http://www.dependencywalker.com/ could be ok) and see if there is anything missing. If libpq.dll is the missing one, try putting it in a PATH directory or in the psycopg2 package directory.
具体解决方案如下：
查找libpq.dll，将其copy到psycopg2的包中，或者放置在系统PATH下即可
