python连接Oracle数据库

#!/usr/bin/python
 
import cx_Oracle
import sys
 
db = "orcl"
user = "test"
passwd = "123456"
 
try:
    my_conn = cx_Oracle.connect(user,passwd,db)
    my_cursor = my_conn.cursor()
except:
    sys.stderr.write("create connection to oralce error\n")
    sys.exit()
    
try:
    my_cursor.execute("select name from user")
    result = my_cursor.fetchall()
    for row in result:
        print str(row[0])
except:
    sys.stderr.write("execute sql error\n")
finally:
    my_cursor.close()
    my_conn.close()