[Tkinter-discuss] Weird bug in input widgets?

Raphaël SEBAN motus at laposte.net
Sat Jan 31 09:20:06 CET 2015

Hi all,

While working on my latest software (tkScenarist on GitHub), I 
encountered a really weird issue: once cleared, input widgets such as 
Text, Entry, ttk.Entry do *NOT* accept composite-accented letters 
(french ê, ë, etc) any more.

So, to get sure, I made the following test code:

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from tkinter import *

def clear_all (event=None):
     # clear stringvars
     for svar in cvars:
     # end for
     # clear text widgets
     for wtext in texts:
         wtext.delete("1.0", END)
     # end for
# end def

def test (nb_of_widgets):
     global root, cvars, texts
     root = Tk()
     root.title("test #{}".format(nb_of_widgets))
     cvars = list()
     for n in range(nb_of_widgets):
         svar = StringVar()
         Entry(root, textvariable=svar).pack()
     # end for
     texts = list()
     for n in range(nb_of_widgets):
         wtext = Text(root, height=2, width=20)
     # end for
     Button(root, text="Clear all", command=clear_all).pack(side=LEFT)
     Button(root, text="Quit", command=root.destroy).pack(side=RIGHT)
     # events main loop
# end def

if __name__ == "__main__":
     # launch test series
     for n in range(1, 4):
     # end for
# end if

Detailed description of the issue:

* French keyboards are arranged in such a way that you must compose 
accented letters as ê (e circumflex) or ë (e diaeresis) by pressing 
first the '^' key and then the letter to compose with (e.g. a, e, i, o, 
u, y) in order to get the final composite-accented letter (â, ä, ê, ë, 
and so on);

* when you launch the test script (cited above) and then type, let's 
say, the e circumflex letter (ê) into the Entry widget and into the Text 
widget, respectively:

	* the first time, you'll get the right letters inserted into the input 
	* then click on 'Clear all' button and enter once again the same 
composite-accented letter into *ALL* the input widgets;
	* secund time, only the last pack()-ed input widget will get the right 
input, all other widgets will show unaccented letters;

* the test script tries with 1 Entry and 1 Text input widgets, then with 
2 input widgets and finally with 3 input widgets;

* each time you get the same issue: only the last pack()-ed input widget 
shows the right input letter, all the rest showing unaccented letters.

This issue is quite embarrassing for me as my latest software manages 
with movie scenario scriptwriting, which *MUST* be written with correct 
accents in French, otherwise all the purpose of the software would collapse.

Is this a known issue?

Thank you for your expert advice.


Raphaël SEBAN alias tarball69.

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