How to add callbacks that is the same function with different argument in Tkinter python26?

[chen zeguang]

code is in the end.
I want to print different number when pressing different button.
Yet the program outputs 8 no matter which button is pressed.
I guess it's because the callback function is not established untill the
button is pressed, and i has already reached to 8.

then How to add callbacks that is the same function with different argument?

CODE:
from Tkinter import *
root = Tk()
def func(x):
    print x
    return

func_en=[]
for i in range(9):
    func_en.append(lambda:func(i))
for i in range(9):
    func_en[i]()
for i in range(9):
    Button(root, text='%d'%i, command=func_en[i]).pack()

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