how to know when text was entered tkinter code example

Example 1: calling a function in python upon entry content changing tkinter

from Tkinter import *

def callback(sv):
    print sv.get()

root = Tk()
sv = StringVar()
sv.trace("w", lambda name, index, mode, sv=sv: callback(sv))
e = Entry(root, textvariable=sv)
e.pack()
root.mainloop()

Example 2: calling a function in python upon entry content changing tkinter

sv.trace_add("write", callback)

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