Problem: Can only check multiple checkbuttons together?

Question

I would like to generate checkbuttons for multiple items. Due to the repetition, I used a loop to initialize the widget and the default state, saving the BooleanVar() and widgets in separate lists. But by doing so, I can only check either check or uncheck all of them together.

I already tried to set different value to the BooleanVar in the list from within the loop, but to no avail.

ckbtnVarList = [tk.BooleanVar()]*len(ckbtnDict["Tag"])
ckbtnWdtList = [None]*len(ckbtnDict["Tag"])

for idx in range(len(ckbtnDict["Tag"])):
    ckbtnVarList[idx].set(1)
    ckbtnWdtList[idx]=ttk.Checkbutton(mainfrm, text=ckbtnDict["Text"][idx], variable=ckbtnVarList[idx]).pack()

Your code does not run. Please provide a Minimal, Complete, and Verifiable example. Be sure to include any imports and test data needed for it to run. — figbeam
– figbeam, Commented Sep 30, 2019 at 7:11
All the items in ckbtnVarList point to the same tk.BooleanVar. The list needs to be filled in a loop or list compréhension not with the multiply operator. — Tls Chris
– Tls Chris, Commented Sep 30, 2019 at 10:26

scotty3785 · Accepted Answer · 2019-10-01 08:35:40Z

1

As specified in the comments above, you need to create your list of BooleanVar's with a list comprehension or a list. The below code shows how to do this. Since you didn't provide a complete code example, I've had to make some assumptions about your input data.

import tkinter as tk

ckbtnDict = {}
ckbtnDict['Tag'] = ["Tag1","Tag2","Tag3"]
ckbtnDict["Text"] = ["Txt1","Txt2","Txt3"]

mainfrm = tk.Tk()
ckbtnVarList = [tk.BooleanVar() for i in range(len(ckbtnDict["Tag"]))]
ckbtnWdtList = [None for i in range(len(ckbtnDict["Tag"]))]

for idx in range(len(ckbtnDict["Tag"])):
    ckbtnVarList[idx].set(1)
    ckbtnWdtList[idx]=tk.Checkbutton(mainfrm, text=ckbtnDict["Text"][idx], variable=ckbtnVarList[idx])
    ckbrnWdtList[idx].pack()

mainfrm.mainloop()

edited Oct 1, 2019 at 8:35

answered Sep 30, 2019 at 15:46

scotty3785

7,0711 gold badge29 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Tls Chris Over a year ago

Careful ckbtnWdtList is a list of Nones. As pack() returns None, it's Nones in the list not Checkbutton objects.

scotty3785 Over a year ago

@TlsChris Well spotted. Edited my answer.

Collectives™ on Stack Overflow

Problem: Can only check multiple checkbuttons together?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related