How can I use the same callback function to trace multiple variables?

Question

I would like to display the value of several StringVar() with some formatting on Labels.

import tkinter as tk

keys = range(2) # 2 for simplicity

r         


        

Answer 1

You can send the key and the input to the function. This is a truncated version and a little different than your code but does what I think you want.

import tkinter as tk
from functools import partial

def callback(key, var, *args):
    print "callback var =", key, var.get()
    ##myStrVars[key].set(var[-1])

root = tk.Tk()

for key in range(5):
    var = tk.StringVar()
    var.trace('w', partial(callback, key, var))
    tk.Entry(root, textvariable=var).pack()

root.mainloop()