python - Textvariable not working with Entry (Tkinter) -

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i'm having trouble entry widget tkinter in python 3.4.1

when running code, entry appears blank while expect display "var" :

# -*- coding: utf8 -*-  tkinter import *  w = tk() v = stringvar()  v.set("var") e = entry(w, textvariable = v) e.pack()  w.mainloop()


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