error

sqlalchemy.exc.ProgrammingError: (ProgrammingError) You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit bytestrings (like text_factory = str). It is highly recommended that you instead just switch your application to Unicode strings. u'INSERT INTO category (parent_id, category_name) VALUES (?, ?)' (999, '\xa4\xa2')

対策

from sqlalchemy.interfaces import PoolListener

class SetTextFactory(PoolListener):
    def connect(self, dbapi_con, con_record):
        dbapi_con.text_factory = lambda x: unicode(unescape(x), "euc-jp", "ignore")

from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker

def create_session():
    engine = create_engine('sqlite:///./test.db', echo=False,  listeners=[SetTextFactory()])
    Session = scoped_session(sessionmaker(autocommit=False,
                                          autoflush=False,
                                          bind=engine))

参考

sanko-:http://saygox.blogspot.jp/2013/08/sqlalchemy.html