Get value of several CheckButtons with same variable name tkinter python

Question

I have a function which creates a dictionary depending on the file the user put in parameter.

And then I create a GUI which create as many CheckButtons as there are elements in dictionary.

Here is my code :

for element in self.listdiagram.dict_diagrams :
    self.diagramVar = IntVar()
    self.diagram = Checkbutton(self.window, text=element, variable=self.diagramVar, onvalue=1, offvalue=0)
    self.diagram.pack(side = BOTTOM)
self.validate = Button(self.window, text="Validate", command=self.validateCallBack, width=15, height=3)
self.validate.pack(side = BOTTOM)

The problem is i can't access to the state of a specific checkbutton as they have all same variable name.

And I don't know how can I name them differently.

I tried to create variable name with dictionary element's name with setattr(self, element, 0) or with exec but it doesn't worked because str(element) can be very long.

How can i do this ?

Thanks for helping.

MatthewG · Accepted Answer · 2019-05-22 14:06:22Z

2

A very simple fix to this would be to use a list, and just add each `Checkbutton` to the list.

For example:

self.diagramVars = []

for element in self.listdiagram.dict_diagrams :
    diagramVar = IntVar()
    diagram = Checkbutton(self.window, text=element, variable=diagramVar, onvalue=1, offvalue=0)
    diagram.pack(side = BOTTOM)

    self.diagramVars.append(diagramVar)

self.validate = Button(self.window, text="Validate", command=self.validateCallBack, width=15, height=3)
self.validate.pack(side = BOTTOM)

Q: For the moment i just want to print the state of each checkbuttons when i push the validate button but my next step is for example if i have self.diagramVars = [1, 0, 0] so the first checkButton is checked and so i want to run another function with the name (or the text) of the checked checkButton in paramater i don't know if i'm clear ?

I believe that this for loop which creates a dictionary with the element as the key will be a suitable solution (if element is able to be used as text=element option then it should be fine to be used as a key):

self.diagramVars = {}

for element in self.listdiagram.dict_diagrams :
    diagramVar = IntVar()
    diagram = Checkbutton(self.window, text=element, variable=diagramVar, onvalue=1, offvalue=0)
    diagram.pack(side = BOTTOM)

    self.diagramVars[element] = diagramVar

self.validate = Button(self.window, text="Validate", command=self.validateCallBack, width=15, height=3)
self.validate.pack(side = BOTTOM)

When you create this dictionary, to retrieve the value of a CheckButton, you will use the line diagramVars[element].get() this will access the "real time" state of the CheckButton

edited May 22, 2019 at 14:06

answered May 22, 2019 at 13:01

MatthewG

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16 Comments

Lucas Over a year ago

Thanks a lot ! I'm trying instead of creating a list to create a dictionnary like this : diagramVars= {self.diagramVar : element} or diagramVars= {element : self.diagramVar} but in both case i have an error.

MatthewG Over a year ago

How would you expect to pull a CheckButton element from this dictionary? Like how do you want to access a specific check button, because right now I don't have the full context of the reason you need a dictionary.

MatthewG Over a year ago

@Lucas No, that's the issue, when you do that, you are setting the self.diagramVars[element] to the int of when the CheckButton is created, basically you are doing this self.diagramVars[element] = 0, because the dragramVars initial value is 0

MatthewG Over a year ago

Using self.diagramVars[element] = diagramVar to assign the dictionary value, and self.diagramVars[element].get() to retrieve the dictionary value would make it an access of the "real time" value

Lucas Over a year ago

Ok i get it ! Thanks a lot !

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Get value of several CheckButtons with same variable name tkinter python

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A very simple fix to this would be to use a list, and just add each `Checkbutton` to the list.

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A very simple fix to this would be to use a list, and just add each Checkbutton to the list.

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A very simple fix to this would be to use a list, and just add each `Checkbutton` to the list.