Python and Mysql(Tkinter+MySQLdb+def)PLEASE HELP!!!

[linux_mania]

I want to make a programme for adding data in my my database(mysql).I did everything right and i can add,delete,change,get data using MySQLdb.
My problem is when i want to add gui(Tkinter) i get error message.I googled and did everything to solve it but stucked.Please help me!!!!!

my code is:

[B]
#-*- coding: utf-8 -*-
from Tkinter import *
import urunekle2
import MySQLdb


def Add():
   x1 = str(Entry.get(x))
   y1 = float(Entry.get(y))
   try:
      conn= MySQLdb.connect(host="localhost",
                                             user="root",
                                             passwd="Amelia83",
                                             db="mydb")
      cursor=conn.cursor()
      cursor.execute("select curdate()")
      tar=cursor.fetchone()
      tar=str(tar[0])
      cursor.execute("""insert into urun
                                 (adi,fiat,ek_tarih)
                                 values
                                 (%s, %s ,%s)""",(x1,y1 ,tar))
     except MySQLdb.Error, e:
       print "Error %d: %s" % (e.args[0],e.args[1])
       sys.exit(1)



root = Tk()

x = Entry(root)
x.grid(row=0, column=0, columnspan=2)

y = Entry(root)
y.grid(row=0, column=2, columnspan=2)

text = Label(root, text="summa")
text.grid(row=1, column=0)

Button(root, text='add', command=Add).grid(row=2, column=0, columnspan=1)


root.mainloop()[/B]

Error message i got in Terminal window is:

Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1413, in __call__
return self.func(*args)
File "think.py", line 14, in Add
db="mydb")
File "/usr/lib/pymodules/python2.6/MySQLdb/__init__.py", line 81, in Connect
return Connection(*args, **kwargs)
File "/usr/lib/pymodules/python2.6/MySQLdb/connections.py", line 129, in __init__
from converters import conversions
File "/usr/lib/pymodules/python2.6/MySQLdb/converters.py", line 165, in <module>
from decimal import Decimal
File "/usr/lib/python2.6/decimal.py", line 3584, in <module>
val = globals()[globalname]
KeyError: 'ROUND_CEiLiNG'

As i mentioned the code without Tkinter:

[B]#!/usr/bin/python
#-*- coding: utf-8 -*-
import sys
import MySQLdb
import time
import os
from Tkinter import *
os.system("clear")
def ekle():
    try:
       conn= MySQLdb.connect(host="localhost",
                                              user="root",
                                              passwd="Amelia83",
                                              db="mydb")
       cursor=conn.cursor()
       adi=raw_input("Ürün adını giriniz :")
       mon=input("Ürünün Fiatını giriniz :")
       cursor.execute("select curdate()")
       tar=cursor.fetchone()
       tar=str(tar[0])
       cursor.execute("""insert into urun
                                  (adi,fiat,ek_tarih)
                                  values
                                  (%s, %s ,%s)""",(adi,mon ,tar))
       print "Data has been successfully added!!!"
    except MySQLdb.Error, e:
       print "Error %d: %s" % (e.args[0],e.args[1])
       sys.exit(1)
ekle()
[/B]

works great.
Please help me.Why things go wrong.Thanks in advance to anyone who would contribute.