Question

I have a list of variable length and want to create a checkbox (with python TKinter) for each entry in the list (each entry corresponds to a machine which should be turned on or off with the checkbox -> change the value in the dictionary).

print enable
{'ID1050': 0, 'ID1106': 0, 'ID1104': 0, 'ID1102': 0}

(example, can be any length)

now the relevant code:

for machine in enable:
    l = Checkbutton(self.root, text=machine, variable=enable[machine])
    l.pack()
self.root.mainloop()

This code produces 4 checkboxes but they are all either ticked or unticked together and the values in the enable dict don’t change. How to solve? (I think the l doesn’t work, but how to make this one variable?)

Answer 1

The “variable” passed to each checkbutton must be an instance of Tkinter Variable – as it is, it is just the value “0” that is passed, and this causes the missbehavior.

You can create the Tkinter.Variable instances on he same for loop you create the checkbuttons – just change your code to:

for machine in enable:
    enable[machine] = Variable()
    l = Checkbutton(self.root, text=machine, variable=enable[machine])
    l.pack()

self.root.mainloop()

You can then check the state of each checkbox using its get method as in
enable["ID1050"].get()