Using a button counter in Python tkinter

Question

I am creating a Menu test for my restaurant as a project and I have the GUI set up how I want but I have run into a problem with the Button updating the value its sending. My plan is for a menu item to appear on the GUI when the button is pressed, the employees then check the appropriate checkboxes (ingredients), then click the sumbit and continue button and the next menu item appears and they continue on the test. Right now I have it set up to where the area for the menu items starts out blank, when I click the button the first time the first item in my list appears but then is never updated no matter how many times the button is pressed. I'm pretty sure I am just setting the counter (what my button is sending) up wrong but I am kinda stumped... Here is a picture of my GUI to hopefully show you what I mean as well as the code I have so far. Thanks for you help it is much appreciated!

***Loop Items Here*** is where the menu items appear when button is pressed

from tkinter import *

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):
        count = number + 1
        item(count)
    def item(number):
        menu = ['nft', 'nckt', 'cat', 'nck outer reef burrito',]
        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)
    count = -1
    B = Button(root, text ="Submit and Continue", relief=RIDGE, fg="black", command= lambda:callBack(count)).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()

Declaring each individual ingredient like that is probably not optimal. I would consider keeping those in a separate file/database and reading them into the program as they are needed. — Joel Cornett
– Joel Cornett, Commented Apr 2, 2012 at 5:16

gary · Accepted Answer · 2012-04-02 02:18:44Z

2

The problem is that count cannot be seen by the callback() function. Trying replacing it with global count at the start of the main() function. This FAQ on global vars in Python should help.

def main():
    global count
    count = -1

    def callback(number):
        global count
        count = number + 1
        ...

answered Apr 2, 2012 at 2:18

gary

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5 Comments

crenfro Over a year ago

thank you so much!! I am new to python and knew it was something simple like that, ahhh I appreciate it!

gary Over a year ago

great. best of luck with your program!

crenfro Over a year ago

thanks so much! I am sure I will have some more questions so stay tuned :) lol

MByD Over a year ago

@garycomtois - not related to here, but there a small confusion regarding the edits you've made recently.. .take a look here: meta.stackexchange.com/questions/128315/…

gary Over a year ago

@BinyaminSharet After rereading it, I guess my mistake was removing the tag wiki body altogether, as opposed to just adding the "DO NOT USE" part to the top, right?

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