[Tkinter-discuss] [Python-Dev] Binding problem

[Guido van Rossum]

Hey Rob,

The place to get help with Tkinter is tkinter-discuss at python.org. I've
CC'ed that list for you.

--Guido

I apologise if I have come to the wrong place here, but 12hrs searching,
plus experimenting, on the WWW for advice on it has not yielded any
successful advice to resolve the issue.
I am am having trouble binding an Entry widget to <Return>
Here is the snippet (butCol is a Frame widget to put buttons,labels and text
entry down LHS)
KS1=StringVar()
KS1.set("Key is ??")
butCol.ks1
=Label(butCol,textvariable=KS1).grid(column=0,row=18,sticky=(N,W))
myKey = [0,2,4,5,7,9,11] #Begin in the key of C
KS2 =StringVar()
KS2.set("C")
butCol.ks2
=Entry(butCol,width=20,textvariable=KS2).grid(column=0,row=19,sticky=(N,W))
The above lines all render correctly, but will not trigger off "entry" of
data at all on <Return>
Adding the following line just crashes.
butCol.ks2.bind("<Return>",chooseKey)
I downloaded the Python 3 package from the recommended site last week to
begin this project (it was previously working OK in Skulptor, but I was not
prepared to develop it any further in that environment, though it was an
excellent starting environment). So I believe the Python language installed
is up todate. I have not previously installed Python so it should be
"clean".
If you could give any direct advice I would be very grateful or if you can
direct me to your best "forum" site maybe I could use that.
One overall observation that has frustrated me is how toi search for
information that relates to Python3 and the latest tkinter modules. I kept
finding old python or old Tkinter or combinations of both. Wrorking my way
through this was very time consuming and rarely productive. Is there any
advice on how to get the "latest" information off the WWW?
Cheers, Rob Ward
PS In my state of eternal optimism I have attached the whole file :-)
PPS I have done some OOP in the past but not keen to jump in at the moment.
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[Michael Lange]

Hi Rob,
(...)

I am am having trouble binding an Entry widget to <Return>
Here is the snippet (butCol is a Frame widget to put buttons,labels
and text entry down LHS)
KS1=StringVar()
KS1.set("Key is ??")
butCol.ks1
=Label(butCol,textvariable=KS1).grid(column=0,row=18,sticky=(N,W))
myKey = [0,2,4,5,7,9,11] #Begin in the key of C
KS2 =StringVar()
KS2.set("C")
butCol.ks2
=Entry(butCol,width=20,textvariable=KS2).grid(column=0,row=19,sticky=
(N,W))
The above lines all render correctly, but will not trigger off
"entry" of data at all on <Return>

Yes, by default pressing the Retrun key on an Entry widget simply does
nothing.

Adding the following line just crashes.
butCol.ks2.bind("<Return>",chooseKey)

I cannot reproduce this crashing here, so I suspect it might have
something to do with chooseKey() ?
To help to track down the problem you might try to run the following
very simple example:

from tkinter import *

root = Tk()

var = StringVar()
var.set('foo')
l = Label(root, textvariable=var)
l.pack()

def test(event):
print(var.get())

e = Entry(root, textvariable=var)
e.pack()
e.bind('<Return>', test)

root.mainloop()

Does this work for you or crash either?

(...)

One overall observation that has frustrated me is how toi search for
information that relates to Python3 and the latest tkinter modules.
I kept finding old python or old Tkinter or combinations of both.
Wrorking my way through this was very time consuming and rarely
productive. Is there any advice on how to get the "latest"
information off the WWW?

There are at least two excellent Tkinter reference manuals available
online:

http://effbot.org/tkinterbook/tkinter-index.htm by Frederik Lundh and
http://infohost.nmt.edu/tcc/help/pubs/tkinter/web/index.html by John W.
Shipman.

There are practically no changes in Tkinter between Python2 and -3
(except that Tkinter in Python3 is now spelled "tkinter" :), so both of
these are still valid.

Regards

Michael


.-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-.

I object to intellect without discipline; I object to power without
constructive purpose.
-- Spock, "The Squire of Gothos", stardate 2124.5

[Bryan Oakley]

When you do this:

butCol.ks2=Entry(...).grid(...)

.... you are setting butCol to None, because .grid(...) returns None.
Separate the widget creation and widget layout into two distinct steps so
that butCol.ks2 has an actual value:

butCol.ks2 = Entry(...)
butCol.ks2.grid(...)

This should then allow the bind to work.

Post by Guido van Rossum
Hey Rob,
The place to get help with Tkinter is tkinter-discuss at python.org. I've
CC'ed that list for you.
--Guido

I apologise if I have come to the wrong place here, but 12hrs searching,
plus experimenting, on the WWW for advice on it has not yielded any
successful advice to resolve the issue.
I am am having trouble binding an Entry widget to <Return>
Here is the snippet (butCol is a Frame widget to put buttons,labels and

text

entry down LHS)
KS1=StringVar()
KS1.set("Key is ??")
butCol.ks1
=Label(butCol,textvariable=KS1).grid(column=0,row=18,sticky=(N,W))
myKey = [0,2,4,5,7,9,11] #Begin in the key of C
KS2 =StringVar()
KS2.set("C")
butCol.ks2

=Entry(butCol,width=20,textvariable=KS2).grid(column=0,row=19,sticky=(N,W))

The above lines all render correctly, but will not trigger off "entry" of
data at all on <Return>
Adding the following line just crashes.
butCol.ks2.bind("<Return>",chooseKey)
I downloaded the Python 3 package from the recommended site last week to
begin this project (it was previously working OK in Skulptor, but I was

not

prepared to develop it any further in that environment, though it was an
excellent starting environment). So I believe the Python language

installed

is up todate. I have not previously installed Python so it should be
"clean".
If you could give any direct advice I would be very grateful or if you

can

direct me to your best "forum" site maybe I could use that.
One overall observation that has frustrated me is how toi search for
information that relates to Python3 and the latest tkinter modules. I

kept

finding old python or old Tkinter or combinations of both. Wrorking my

way

through this was very time consuming and rarely productive. Is there any
advice on how to get the "latest" information off the WWW?
Cheers, Rob Ward
PS In my state of eternal optimism I have attached the whole file :-)
PPS I have done some OOP in the past but not keen to jump in at the

moment.

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Python-Dev mailing list
Python-Dev at python.org
https://mail.python.org/mailman/listinfo/python-dev
https://mail.python.org/mailman/options/python-dev/guido%40python.org

--
--Guido van Rossum (python.org/~guido)
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