ImportError:无法导入名称DefaultEngineStategy

Question

我正在尝试运行我制作的python游戏源代码，但每次执行“python Login.py”时，我都会得到以下全部回溯：

Traceback (most recent call last): File "Login.py", line 1, in <module> from Houdini.HoudiniFactory import HoudiniFactory File "/var/xsource/Houdini/HoudiniFactory.py", line 18, in <module> from Houdini.Crumbs import retrieveItemCollection, retrieveRoomCollection, \ File "/var/xsource/Houdini/Crumbs/__init__.py", line 45, in <module> from Houdini.Crumbs.Room import RoomSchema, RoomCollection File "/var/xsource/Houdini/Crumbs/Room.py", line 6, in <module> from Houdini.Handlers.Games.Table import leaveTable File "/var/xsource/Houdini/Handlers/Games/__init__.py", line 4, in <module> from Houdini.Handlers.Play.Moderation import cheatBan File "/var/xsource/Houdini/Handlers/Play/Moderation.py", line 4, in <module> from Houdini.Data.Penguin import Penguin File "/var/xsource/Houdini/Data/__init__.py", line 5, in <module> from alchimia.engine import TwistedEngine File "/home/ubuntu/.local/lib/python2.7/site-packages/alchimia/__init__.py", line 3, in <module> from alchimia.strategy import TWISTED_STRATEGY File "/home/ubuntu/.local/lib/python2.7/site-packages/alchimia/strategy.py", line 3, in <module> from sqlalchemy.engine.strategies import DefaultEngineStrategy ImportError: cannot import name DefaultEngineStrategy