Why is Tkinter Entry s get function returning nothing

Question

I m trying to use an Entry field to get manual input  and then work with that data   All sources I ve found claim I should use the get   function  but I haven t found a simple working mini example yet  and I can t get it to work   I hope someone can tel me what I m doing wrong  Here s a mini file   from tkinter import     master   Tk    Label master  text  Input     grid row 0  sticky W   entry   Entry master  entry grid row 0  column 1   content   entry get   print content     does not work  mainloop     This gives me an Entry field I can type in  but I can t do anything with the data once it s typed in   I suspect my code doesn t work because initially  entry is empty  But then how do I access input data once it has been typed in

User · Answer

You could also use a StringVar variable  even if it s not strictly necessary   v   StringVar    e   Entry master  textvariable v  e pack    v set  a default value   s   v get     For more information  see this page on effbot org

User · Answer

A simple example without classes   from tkinter import       master   Tk      Create this method before you create the entry def return entry en          Gets and prints the content of the entry        content   entry get       print content     Label master  text  Input     grid row 0  sticky W   entry   Entry master  entry grid row 0  column 1     Connect the entry with the return button entry bind   lt Return gt    return entry    mainloop

User · Answer

you need to put a textvariable in it  so you can use set   and get   method    var StringVar   x  Entry  root textvariable var

User · Answer

It looks like you may be confused as to when commands are run  In your example  you are calling the get method before the GUI has a chance to be displayed on the screen  which happens after you call mainloop   Try adding a button that calls the get method  This is much easier if you write your application as a class  For example   import tkinter as tk  class SampleApp tk Tk       def   init   self           tk Tk   init   self          self entry   tk Entry self          self button   tk Button self  text  Get   command self on button          self button pack           self entry pack        def on button self           print self entry get     app   SampleApp   app mainloop     Run the program  type into the entry widget  then click on the button

User · Answer

master   Tk   entryb1   StringVar  Label master  text  Input     grid row 0  sticky W   Entry master  textvariable entryb1  grid row 1  column 1   b1   Button master  text  continue   command print content  b1 grid row 2  column 1   def print content        global entryb1     content   entryb1 get       print content   master mainloop     What you did wrong was not put it inside a Define function then you hadn t used the  get function with the textvariable you had set

[python] Why is Tkinter Entry's get function returning nothing?

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