完全搞不懂这个错误是什么原因引起的 unsupported operand type(s) for %: 'TableAdmininfo' and 'tuple' - V2EX
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scott123

完全搞不懂这个错误是什么原因引起的 unsupported operand type(s) for %: 'TableAdmininfo' and 'tuple'

  •  
  •   scott123 Jan 13, 2016 3307 views
    This topic created in 3761 days ago, the information mentioned may be changed or developed.
    class TableAdmininfo(object):
    def __init__(self):
    self.__tables=sqlaction()

    def GetNamePasswd(self,name):
    sql="SELECT passwd from admininfo WHERE username=%s"
    params=(name,)
    return self.__tables.select_fet(self,sql,*params)

    class sqlaction(object):def select_fet(self,sql,*params):
    try:
    cOnn=MySQLdb.connect(**db_dict)
    cur=conn.cursor(cursorclass=MySQLdb.cursors.DictCursor)
    #sql="SELECT passwd from admininfo WHERE username=%s"
    #params=("jerry",)
    cur.execute(sql,params)
    rows=cur.fetchall()
    print rows
    return rows
    except Exception,e:
    print e
    sys.exit(1)
    finally:
    if conn:
    cur.close()
    conn.close()

    通过第一个类调用第二个类就会爆那个错误,但是直接使用注释的代码执行就没有问题,完全搞不懂怎么回事??并且第二个类在被别的类调用时候完全没有问题啊
    3 replies    2016-01-13 12:40:40 +08:00
    fy
        1
    fy  
       Jan 13, 2016
    楼主先不要慌,切 markdown 排下版

    ```python
    pass
    ```

    虽然代码没有看得很明白,猜测是类型转换问题?楼主你直接把上面那个类对象传进去了?

    - - 建议楼主看一下 PEP8 ,然后用个 ORM 操作数据库,推荐 Peewee 或者 SQLAlchemy
    mulog
        2
    mulog  
       Jan 13, 2016
    self.__tables.select_fet(self,sql,*params)
    第一个 self 参数是多余的,你这样写相当于把这个 self (an instance of TableAdmininfo )当作 'sql' 参数传给了 select_fet
    scott123
        3
    scott123  
    OP
       Jan 13, 2016
    谢谢二楼,一只没有关注到这里,问题解决,谢谢一楼,学习一下你提到的。
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