I used sqlite + pysqlite2 + sqlalchemy. But there are some confused error. eg.undefined symbol

File "/home/myweb/app/db.py", line 40, in init

engine = create_engine('sqlite:///'+db_path)

File "/usr/local/lib/python2.7/site- packages/sqlalchemy/engine/init.py", line 386, in create_engine

return strategy.create(*args, **kwargs)

File "/usr/local/lib/python2.7/site- packages/sqlalchemy/engine/strategies.py", line 75, in create

dbapi = dialect_cls.dbapi(**dbapi_args)

File "/usr/local/lib/python2.7/site- packages/sqlalchemy/dialects/sqlite/pysqlite.py", line 339, in dbapi

 raise e

ImportError: /usr/local/lib/python2.7/site-packages/pysqlite2/_sqlite.so:

undefined symbol: PyOS_mystrnicmp