Update Tkinter Label from variable

Question

I wrote a Python script that does some task to generate, and then keep changing some text stored as a string variable. This works, and I can print the string each time it gets changed.

I can get the Label to display the string for the first time, but it never updates.

Here's my code:

from tkinter import *  outputText = 'Ready' counter = int(0)  root = Tk() root.maxsize(400, 400)  var = StringVar()  l = Label(root, textvariable=var, anchor=NW, justify=LEFT, wraplength=398) l.pack()  var.set(outputText)  while True:     counter = counter + 1     outputText = result     outputText = result     outputText = result     if counter == 5:         break  root.mainloop() 

The Label will show Ready, but won't update to change that to the strings as they're generated later.

After a fair bit of googling and looking through answers on this site, I thought the solution might be to use update_idletasks. I tried putting that in after each time the variable was changed, but it didn't help.

Answer 1

The window is only displayed once the mainloop is entered. So you won't see any changes you make in your while True block preceding the line root.mainloop().

---

GUI interfaces work by reacting to events while in the mainloop. Here's an example where the StringVar is also connected to an Entry widget. When you change the text in the Entry widget it automatically changes in the Label.

from tkinter import *  root = Tk() var = StringVar() var.set('hello')  l = Label(root, textvariable = var) l.pack()  t = Entry(root, textvariable = var) t.pack()  root.mainloop() # the window is now displayed 

I like the following reference: tkinter 8.5 reference: a GUI for Python

---

Here is a working example of what you were trying to do:

from tkinter import * from time import sleep  root = Tk() var = StringVar() var.set('hello')  l = Label(root, textvariable = var) l.pack()  for i in range(6):     sleep(1) # Need this to slow the changes down     var.set('goodbye' if i%2 else 'hello')     root.update_idletasks() 

root.update Enter event loop until all pending events have been processed by Tcl.

Answer 2

Maybe I'm not understanding the question but here is my simple solution that works -

# I want to Display total heads bent this machine so I define a label - TotalHeadsLabel3 = Label(leftFrame) TotalHeadsLabel3.config(font=Helv12,fg='blue',text="Total heads " + str(TotalHeads)) TotalHeadsLabel3.pack(side=TOP)  # I update the int variable adding the quantity bent - TotalHeads = TotalHeads + headQtyBent # update ready to write to file & display TotalHeadsLabel3.config(text="Total Heads "+str(TotalHeads)) # update label with new qty 

I agree that labels are not automatically updated but can easily be updated with the

<label name>.config(text="<new text>" + str(<variable name>)) 

That just needs to be included in your code after the variable is updated.