Reputation: 53
I’m struggling with defining checkbuttons in a loop. Below, I have written a very simplified representation of my actual code with 2 versions. Version 1 works fine. However version 2 (with the loop), which I would like to use in my project, does not work. It only works for the last item in the row. I do not understand why this is as checking the values of the varlist reveals that the IntVars in it are defined and set, see the comment ‘# CHECKING’. I also tried a version with a dictionary of IntVars, but that didn’t work neither. I hope somebody can explain what is wrong with version 2. Many thanks.
import tkinter as tk
def state(var):
if var.get():
val = var.get()
print(val)
root = tk.Tk()
# VERSION 1
var1, var2, var3, var4 = tk.IntVar(), tk.IntVar(), tk.IntVar(), tk.IntVar()
var5, var6, var7, var8 = tk.IntVar(), tk.IntVar(), tk.IntVar(), tk.IntVar()
var1.set(0), var2.set(0), var3.set(0), var4.set(0)
var5.set(0), var6.set(0), var7.set(0), var8.set(0)
tk.Label(root, text = 'Version 1, Choose:').pack()
tk.Checkbutton(root, text = 'item1', variable = var1, command = lambda: state(var1)).pack()
tk.Checkbutton(root, text = 'item2', variable = var2, command = lambda: state(var2)).pack()
tk.Checkbutton(root, text = 'item3', variable = var3, command = lambda: state(var3)).pack()
tk.Checkbutton(root, text = 'item4', variable = var4, command = lambda: state(var4)).pack()
tk.Checkbutton(root, text = 'item5', variable = var5, command = lambda: state(var5)).pack()
tk.Checkbutton(root, text = 'item6', variable = var6, command = lambda: state(var6)).pack()
tk.Checkbutton(root, text = 'item7', variable = var7, command = lambda: state(var7)).pack()
tk.Checkbutton(root, text = 'item8', variable = var8, command = lambda: state(var8)).pack()
# VERSION 2
tk.Label(root, text = '').pack()
tk.Label(root, text = 'Version 2, Choose:').pack()
varlist =[]
itemlist = ['item1','item2','item3','item4', 'item5','item6','item7','item8']
for item in itemlist:
var = tk.IntVar()
var.set(0)
varlist.append(var)
tk.Checkbutton(root, text = item, variable = var, command = lambda: state(var)).pack()
print(var, var.get()) # CHECKING
root.mainloop()
Upvotes: 0
Views: 16