[Python] Restricting the value in Tkinter Entry widget

I need to restrict the values in the Entry widget to numbers only. The way I implemented is:

import numpy as np
from Tkinter import *;
import tkMessageBox;

class window2:

def __init__(self,master1):

self.panel2=Frame(master1)
self.panel2.grid()

self.button2=Button(self.panel2,text="Quit",command=self.panel2.quit)
self.button2.grid()

self.text1=Entry(self.panel2)
self.text1.grid()
self.text1.bind('<KeyPress>', self.keybind1)
self.text1.focus()

def keybind1 (self,event):
if event.int in np.linspace(0,9,10):
print event.int


root1=Tk()
window2(root1)
root1.mainloop()


I keep getting error message that Event instance has no attribute 'int'. What should I do?

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