使用python将值导入MySQL数据库时出现SQL语法错误

python和MySQL的新手，正在通过互联网和书籍自学。我正在努力将值导入数据库表中。我不断收到错误消息，指出SQL语法不正确。在Windows 8计算机上使用Python 2.7.9和MySQL Connector 5.6。

这是我收到的错误；

追溯（最近一次通话）：文件“ C：\ Users \ Oliver \ Desktop \ test.py”，cursor.execute（newitem，newdata）中的第43行＃执行添加新项的SQL语句

在执行self._handle_result（self._connection.cmd_query（stmt））的文件“ C：\ Python27 \ lib \ site-packages \ mysql \ connector \ cursor.py”中，第507行

文件“ C：\ Python27 \ lib \ site-packages \ mysql \ connector \ connection.py”，行> 722，在cmd_query结果= self._handle_result（self._send_cmd（ServerCmd.QUERY，查询））

_handle_result中的文件“ C：\ Python27 \ lib \ site-packages \ mysql \ connector \ connection.py”，行> 640引发错误。get_exception（packet）

ProgrammingError：1064（42000）：您的SQL语法有错误；检查>与MySQL服务器版本相对应的手册，以在第1行的'desc）VALUES（'5012583200796'，'test'）'附近使用正确的语法

这是我编写的代码；

# Add Stock bare bones
# Program that will add stock to the database

import mysql.connector

print "\t\tWelcome to the stock adding page\n"

selection = raw_input("Did you want to add stock or a new item? (Y,N)").lower()

while selection == "y":

    bcode = " " # Generate barcode variable

    while bcode == " ": # while barcode variable is empty
          bcode = raw_input("Please scan an object ") # ask for user to input barcode

    print "The barcode you scanned is", bcode

    cnx = mysql.connector.connect(user='root', password='Blackops123!', # variable to connect to foody friend database
                                     host='127.0.0.1',
                                     database='food_friend')

    cursor = cnx.cursor() # cursor to make changes to database

    query = ("SELECT barcode FROM stock_list " # query stock_list database tabelf ro barcode scanned in by user
         "WHERE barcode = %s")

    cursor.execute(query, (bcode,))# execute the query within the database

    result = cursor.fetchone() # fetch result from the query and assign variable

    if result == None: # If the barcode does not exist add a new item
        print "New item to database!\n"

        description = raw_input("Please describe product (45 character limit)") # user input for object description, limited to 45 chars as per database

        newitem = ("INSERT INTO stock_list " # SQL statement to add new item into the database with description
               "(barcode, desc) "
               "VALUES (%s,%s)")
        newdata = (bcode, description)

        cursor.execute(newitem, newdata) # executes SQL statement for adding new item

        cnx.commit() # accept addition of the new item
        print "Please scan item again as new item to add stock level" # as no stock level is added the user has to run around again. Will fix eventually

    selection = raw_input("Did you want to add stock or a new item? (Y,N)").lower()

print "returning to main menu"

end = raw_input("click something to end")

我已经尝试过按照MySQL文档中的建议在元组和字典中设置值条目，但是由于错误中显示的值被拾取，所以它仍然保持原样。我已经试过了％s，有无单括号，无济于事。

谁能建议我可能出了什么问题？