python之SQLAlchemy 和 VirtualEnv 的问题

我试图在 OS X 10.5 的 virtualenv 下使用 SQLAlchemy，但似乎无法加载它。

这是我做的

mkvirtualenv --no-site-packages test 
easy_install sqlalchemy 

我尝试从解释器导入 sqlalchemy，一切正常，但如果我尝试从 python 脚本导入 sqlalchemy，我会收到以下错误:

这是来自 IBM 的教程脚本

from sqlalchemy.ext.declarative import declarative_base 
from sqlalchemy import Table, Column, Integer, String, MetaData, ForeignKey 
 
Base = declarative_base() 
class Filesystem(Base): 
    __tablename__ = 'filesystem' 
 
    path = Column(String, primary_key=True) 
    name = Column(String) 
 
    def __init__(self, path,name): 
        self.path = path 
        self.name = name 
 
    def __repr__(self): 
        return "<Metadata('%s','%s')>" % (self.path,self.name) 

我尝试运行“python test.py”，结果如下:

$ python test.py  
Traceback (most recent call last): 
  File "test.py", line 4, in <module> 
    from sqlalchemy import Table, Column, Integer, String, MetaData, ForeignKey 
  File "/Users/grant/Development/Aircraft/sqlalchemy.py", line 3, in <module> 
    from sqlalchemy.ext.declarative import declarative_base 
ImportError: No module named ext.declarative 

这是我的 sys.path 中的内容

>>> import sys 
>>> print '\n'.join(sys.path) 
 
/Users/grant/Development/Python/test/lib/python2.6/site-packages/setuptools-0.6c9-py2.6.egg 
/Users/grant/Development/Python/test/lib/python2.6/site-packages/SQLAlchemy-0.5.4p2-py2.6.egg 
/Users/grant/Development/Python/test/lib/python26.zip 
/Users/grant/Development/Python/test/lib/python2.6 
/Users/grant/Development/Python/test/lib/python2.6/plat-darwin 
/Users/grant/Development/Python/test/lib/python2.6/plat-mac 
/Users/grant/Development/Python/test/lib/python2.6/plat-mac/lib-scriptpackages 
/Users/grant/Development/Python/test/lib/python2.6/lib-tk 
/Users/grant/Development/Python/test/lib/python2.6/lib-old 
/Users/grant/Development/Python/test/lib/python2.6/lib-dynload 
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6 
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-darwin 
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/lib-tk 
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-mac 
/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/plat-mac/lib-scriptpackages 
/Users/grant/Development/Python/test/lib/python2.6/site-packages 

对发生的事情有什么想法吗？？

请您参考如下方法:

我解决了我自己的问题......我在我工作的同一个文件夹中有另一个名为 sqlalchemy.py 的脚本，它把所有东西都搞砸了。