python基于SQLAchemy的DBtools

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

BIZ_DB = {"dbusr":"test","dbpasswd":"123456","dburl":"127.0.0.1:3306","dbname":"test"}
OFFLINE_DB = {"dbusr":"test","dbpasswd":"123456","dburl":"127.0.0.1:3306","dbname":"test"}

def create_session(dbusr,dbpasswd,dburl,dbname):
    engine = create_engine("mysql+pymysql://{}:{}@{}/{}".format(dbusr,dbpasswd,dburl,dbname))
    DBsession = sessionmaker(bind=engine)
    session = DBsession()
    return session

def create_session_biz():
    dbusr = BIZ_DB["dbusr"]
    dbpasswd = BIZ_DB["dbpasswd"]
    dburl = BIZ_DB["dburl"]
    dbname = BIZ_DB["dbname"]
    return create_session(dbusr,dbpasswd,dburl,dbname)

def create_session_offline():
    dbusr = OFFLINE_DB["dbusr"]
    dbpasswd = OFFLINE_DB["dbpasswd"]
    dburl = OFFLINE_DB["dburl"]
    dbname = OFFLINE_DB["dbname"]
    return create_session(dbusr, dbpasswd, dburl, dbname)