Python loop dictionary elements via tkinter GUI with button

Question

I am currently doing a menu test for my restaurant. I made a GUI and am satisfied with my main format (for now), but I am fixated on how to take the next step.

I have several checkboxes configured (different ingredients), and the plan is that for different menu items it scrolls (appears on the screen), then the employee checks the corresponding ingredients, clicks the submit and continue button that I made, and then the next one appears menu item instead of the previous one. I will be much more than reading and storing the entrance, but for now I wanted to jump with this obstacle before moving on.

I'm new to using Python for GUIs, so I'm not sure if this is the best way to do this.

I found different code examples, but nothing concrete to implement in my program. Any advice is greatly appreciated!

Here is my GUI:

from tkinter import * globalvar = -1 class Example(Frame): def __init__(self, parent): Frame.__init__(self, parent, background="white") self.parent = parent self.initUI() def initUI(self): self.parent.title("Wahoos Menu Test") def main(): def callBack(number): globalvar = number + 1 item(globalvar) def item(number): menu = ['nft', 'nckt'] m = Label(root, text=menu[number], fg="orange").grid(row=7, column=0) root = Tk() app = Example(root) #root.geometry("750x750+400+50") for r in range(20): for c in range(14): Label(root, text='', borderwidth=0).grid(row=r,column=c) B = Button(root, text ="Submit and Continue", relief=RIDGE, fg="black", command= lambda:callBack(globalvar)).grid(row=19, column=7) L = Label(root, text="What comes in the following", fg="blue").grid(row=6, column=0) #I = Label(root, text="***Loop Items Here***", fg="blue").grid(row=7, column=0) V = Label(root, text="Veggies", fg="green").grid(row=1, column=11, sticky=W) v1 = IntVar() Checkbutton(root, text="Lettuce", variable=v1, fg="black").grid(row=2, column=11, sticky=W) v2 = IntVar() Checkbutton(root, text="Cabbage", variable=v2).grid(row=3, column=11, sticky=W) v3 = IntVar() Checkbutton(root, text="Cheese", variable=v3).grid(row=4, column=11, sticky=W) v4 = IntVar() Checkbutton(root, text="Ahee Rice", variable=v4).grid(row=5, column=11, sticky=W) v5 = IntVar() Checkbutton(root, text="Brown Rice", variable=v5).grid(row=6, column=11, sticky=W) v6 = IntVar() Checkbutton(root, text="Banzai Veg", variable=v6).grid(row=7, column=11, sticky=W) v7 = IntVar() Checkbutton(root, text="Red Cabbage", variable=v7).grid(row=8, column=11, sticky=W) v8 = IntVar() Checkbutton(root, text="Black Beans", variable=v8).grid(row=9, column=11, sticky=W) v9 = IntVar() Checkbutton(root, text="Cajun White Beans", variable=v9).grid(row=10, column=11, sticky=W) T = Label(root, text="Tortillas ", fg="green").grid(row=1, column=12, sticky=W) t1 = IntVar() Checkbutton(root, text="Corn ", variable=t1).grid(row=2, column=12, sticky=W) t2 = IntVar() Checkbutton(root, text="Flour", variable=t2).grid(row=3, column=12, sticky=W) P = Label(root, text="Proteins", fg="green").grid(row=1, column=13, sticky=W) p1 = IntVar() Checkbutton(root, text="Carne Asada", variable=p1).grid(row=2, column=13, sticky=W) p2 = IntVar() Checkbutton(root, text="Flamebroiled Chicken", variable=p2).grid(row=3, column=13, sticky=W) p3 = IntVar() Checkbutton(root, text="Blackened Chicken", variable=p3).grid(row=4, column=13, sticky=W) p4 = IntVar() Checkbutton(root, text="Flamebroiled Fish", variable=p4).grid(row=5, column=13, sticky=W) p5 = IntVar() Checkbutton(root, text="Pork", variable=p5).grid(row=6, column=13, sticky=W) p6 = IntVar() Checkbutton(root, text="Shrimp", variable=p6).grid(row=7, column=13, sticky=W) p7 = IntVar() Checkbutton(root, text="Tofu", variable=p7).grid(row=8, column=13, sticky=W) p8 = IntVar() Checkbutton(root, text="Blackened Mushroom", variable=p8).grid(row=9, column=13, sticky=W) p9 = IntVar() Checkbutton(root, text="Rice and Beans", variable=p9).grid(row=10, column=13, sticky=W) p10 = IntVar() Checkbutton(root, text="Banzai Veg", variable=p10).grid(row=11, column=13, sticky=W) S = Label(root, text="Sauces", fg="green").grid(row=1, column=14, sticky=W) s1 = IntVar() Checkbutton(root, text="Salsa", variable=s1).grid(row=2, column=14, sticky=W) s2 = IntVar() Checkbutton(root, text="Guacamole", variable=s2).grid(row=3, column=14, sticky=W) s3 = IntVar() Checkbutton(root, text="Sour Cream", variable=s3).grid(row=4, column=14, sticky=W) s4 = IntVar() Checkbutton(root, text="Roasted Pepper", variable=s4).grid(row=5, column=14, sticky=W) s5 = IntVar() Checkbutton(root, text="Ketchup", variable=s5).grid(row=6, column=14, sticky=W) s6 = IntVar() Checkbutton(root, text="Ranch", variable=s6).grid(row=7, column=14, sticky=W) s7 = IntVar() Checkbutton(root, text="Balsamic", variable=s7).grid(row=8, column=14, sticky=W) s8 = IntVar() Checkbutton(root, text="Mr. Lees", variable=s8).grid(row=9, column=14, sticky=W) s9 = IntVar() Checkbutton(root, text="Teriyaki", variable=s9).grid(row=10, column=14, sticky=W) s10 = IntVar() Checkbutton(root, text="Tapatio", variable=s10).grid(row=11, column=14, sticky=W) s11 = IntVar() Checkbutton(root, text="Cream Cheese", variable=s11).grid(row=12, column=14, sticky=W) s12 = IntVar() Checkbutton(root, text="Aoli", variable=s12).grid(row=13, column=14, sticky=W) root.bind('<Return>', callBack) root.mainloop() if __name__ == '__main__': main() 

Answer 1

In your method, callBack globalvar = number + 1 does not update the value of the globalvar global variable, it creates a new local variable called globalvar . If you want to change the globalvar variable, you need to add global globalvar to your method in order to explicitly refer to your global variable.

 def callBack(number): global globalvar globalvar = number + 1 item(globalvar) 

Note that using such a global variable you do not need to have the value passed as a parameter, and can just use Button(...,command=callBack)

Other comments:

• with the mesh geometry manager you don’t need to create a 20x14 empty label table (deleting this loop will not change anything)
• in item , instead of creating a label, you can update the text of the existing one (this means that (1) contains a link to the label in the variable (2) a call to config(text="new text") in this link) Creating new labels will reveal danger when replacing the labels is shorter (now you just stack them on top of the others).
• when you initialize B, L, I, V, you do not store anything in a variable. You save the answer to the grid call (which is always None). To save a link to elements, you need to split your code into two lines:

 L = Label(root, text="What comes in the following", fg="blue") L.grid(row=6, column=0) 

Answer 2

So what is the problem? The title mentions a loop through a dictionary. Tkinter is no different from any other library - you can loop like you for anything else.

For instance:

 for thing in ("Lettuce", "Cabbage", "Cheese"): var[thing] = IntVar() cb[thing] = Checkbutton(root, text=thing, variable=var[thing], ...) cb[thing].grid(...) 

Is there anything else you were looking for?