Python, Tkinter: Get Text from Checkbutton when Checked

Question

I'm working with the following code. My goal is to get the text of a Checkbutton when it is checked, and append that text to a list. I want to write the code dynamically, because the size of list 'x' may change. Here's what I have so far:

from Tkinter import *
root = Tk()

global j
j = []

x = ['hello', 'this', 'is', 'a', 'list']

def chkbox_checked():
    j.append(c.cget("text"))

for i in x:

    c = Checkbutton(root, text=i, command=chkbox_checked)
    c.grid(sticky=W)

mainloop()

print j

My output so far for j has been:

['list', 'list', 'list', 'list', 'list'] #depending on how many Checkbuttons I select

I'm looking for an output that is like this:

['this', 'list'] #depending on the Checkbuttons that I select; this would be the output if I
#selected Checkbuttons "this" and "list".

I've experimented with the "variable" option in the Checkbutton, but I can't seem to connect the dots. Can anyone point me in the right direction? I have a feeling it's relatively straightforward. Thanks!

global at global scope is meaningless (same as pass). I suggest you remove it. — Terry Jan Reedy
– Terry Jan Reedy, Commented Sep 14, 2014 at 22:43

code monkey · Accepted Answer · 2014-09-12 06:22:54Z

2

The problem is that the variable c in the for loop is reassigned every iteration. That's why it only prints the last element list.

One solution is to use lambda functions.

def chkbox_checked(text):
    return lambda : j.append(text)

for i in x:
    c = Checkbutton(root, text=i, command=chkbox_checked(i))
    c.grid(sticky=W)

answered Sep 12, 2014 at 6:22

code monkey

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