Python Tkintel Button widget

[SkyPlooM]

Hi,
I'm trying to program a python mini applet which I want it does something like this:

2, 3, 4...n buttons depending on the options.
When pressed, writes its value.
Well, I always have printed the last value from the array.
Here is the code:

from Tkinter import *

def writing():
print a

root = Tk()
cont = 0
texto=["a","b","c","d"]
for a in texto:
cont = cont + 1
elemento = Button(root, text=a, command=writing, justify=LEFT, width=25)
elemento.grid (row=cont, column=1, sticky=W)

root.mainloop()
The problem is I don't know how to associate the a value each time to the button and send it to writing.

Thanks and Cheers

[unutbu]

You could move the def of writing into the loop:
for a in texto:
def writing(astr=a):
# When you give astr a default value, the default value a is evaluated
# at the time writing is *defined*, not when writing is *called*.
# Thus variable a saves the right value each time through the loop
print astr
cont = cont + 1
elemento = Button(root, text=a, command=writing, justify=LEFT, width=25)

[SkyPlooM]

Working perfectly, thanks a lot