Python virtualenv中的SQLAlchemy错误

我正在尝试在没有root权限的计算机上运行python脚本。为此，我使用Python2.7设置了一个

virtualenv

，然后添加了两个需要并行Python和SQLAlchemy的包。运行脚本时，出现以下错误：

(virtPython)thaddeus:recipes ab940$ python2.7 matchIngsParallel.py 
Starting pp with 8 workers
Reading ingredients into dictionary
Traceback (most recent call last):
  File "matchIngsParallel.py", line 65, in <module>
    for synonym, parentIng in session.query(IngSyn.synonym, IngSyn.parentIng): 
  File "build/bdist.macosx-10.6-intel/egg/sqlalchemy/orm/query.py", line 2227, in     __iter__
  File "build/bdist.macosx-10.6-intel/egg/sqlalchemy/orm/query.py", line 2242, in     _execute_and_instances
  File "build/bdist.macosx-10.6-intel/egg/sqlalchemy/engine/base.py", line 1449, in execute
  File "build/bdist.macosx-10.6-intel/egg/sqlalchemy/engine/base.py", line 1584, in _execute_clauseelement
  File "build/bdist.macosx-10.6-intel/egg/sqlalchemy/engine/base.py", line 1698, in _execute_context
  File "build/bdist.macosx-10.6-intel/egg/sqlalchemy/engine/base.py", line 1691, in _execute_context
  File "build/bdist.macosx-10.6-intel/egg/sqlalchemy/engine/default.py", line 331, in do_execute
sqlalchemy.exc.OperationalError: (OperationalError) no such table: ingSyns u'SELECT     "ingSyns".synonym AS "ingSyns_synonym", "ingSyns"."parentIng" AS "ingSyns_parentIng" \nFROM     "ingSyns"' ()

（此代码缩短，但包括错误发生的位置）

assignDB

如下所示：

from sqlalchemy import Column, Integer, String, ForeignKey, create_engine, Table
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, backref, sessionmaker
from sqlalchemy.dialects.sqlite import DATETIME, REAL

engine = create_engine('sqlite:///recDB.db')
Session = sessionmaker(bind=engine)
session = Session()
Base = declarative_base()

然后是类定义

---

我已经在其他计算机上尝试过这个脚本（不过我有根访问权限），包括在其他VirtualNV中，它工作得很好。我对可能出现的问题感到非常困惑

您的脚本可以访问数据库，但其中似乎没有表。我想您是从另一台机器上复制了脚本，您是否也复制了SQLite数据库文件

recDB.db

？

是的，我正在访问dropbox文件夹，因此它在所有机器上都是相同的。我认为virtualenv调用导入的方式存在一些问题，特别是

assignDB

？如果在创建引擎时找不到数据库，它不会传递错误吗？如果SQLite驱动程序找不到文件，它会创建它，这样您就不会在那里看到错误<代码>'sqlite:///recDB.db“是相对于当前工作目录的路径，我想您应该在

cd

ing到dropbox文件夹后启动python shell？您的

assignDB

导入成功，否则脚本的第一行将出现

ImportError

。你凭什么认为这是个进口问题？

from sqlalchemy import Column, Integer, String, ForeignKey, create_engine, Table
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, backref, sessionmaker
from sqlalchemy.dialects.sqlite import DATETIME, REAL

engine = create_engine('sqlite:///recDB.db')
Session = sessionmaker(bind=engine)
session = Session()
Base = declarative_base()