python bsddb berkeley db 存储类型

key只允许bytes

value只允许 bytes、None

import bsddb3  
import struct
my_db = bsddb3.db.DB()
my_db.open("mydb.db",dbtype =bsddb3.db.DB_HASH,flags=bsddb3.db.DB_CREATE)
my_db.put("name".encode("utf-8"),"xiaoming".encode("utf-8"))
my_db.put("age".encode("utf-8"),struct.pack("i",22))
my_db.close()