Dictionaries in tkinter Python 3

Question

I am making a program using dictionaries to store buttons in tkinter. However, an error comes up when i run it:

KeyError: 'Science, sheet'

On this line:

btn[a].grid_forget()

I do not understand this error though since I have printed the dictionary and this key does exist. Here is my code:

import tkinter

Homework = {"English, essay": "10/11/17", "Science, sheet": "11/12/17"}

def Done(a):
    lbl[a].grid_forget()
    btn[a].grid_forget()

def MakeGui():
    global lbl, btn

    window  = tkinter.Tk()
    window.title("Homework")
    window.geometry("800x400")

    Counter = 0
    btn = {}
    lbl = {}
    for item in Homework:
        Counter += 1

        lbl[item] = tkinter.Label(window, text=(item + " " +  Homework[item]))
        lbl[item].grid(row=Counter, column=0)

        btn[item] = tkinter.Button(window, text=("Done"), command=Done(item))
        btn[item].grid(row=Counter, column=5)
        print (btn, lbl)

    window.mainloop()

MakeGui()

The print of btn and lbl results in:

{'Science, sheet': <tkinter.Button object at 0x02E5F0D0>} {'Science, sheet': <tkinter.Label object at 0x02E59DD0>}
{'Science, sheet': <tkinter.Button object at 0x02E5F0D0>, 'English, essay': <tkinter.Button object at 0x02E97670>} {'Science, sheet': <tkinter.Label object at 0x02E59DD0>, 'English, essay': <tkinter.Label object at 0x02E66F50>}

This may be me being stupid but to me it looks like the dictionaries do contain the keys 'Science, sheet'.

My goal for this program is when you click one of the "Done" buttons both it and the label to the left of it disappear. Any help is appreciated.

The "duplicate" question won't help you much, because you are assigning from a variable inside a loop. You will have to use `functools.partial` instead of `lambda`. — Novel, Nov 09 '17 at 23:13
@Novel comment helped me out, once doing research into it. It is now working by keeping the function and where command is I wrote "command=functools.partial(Done, item)" which made my program work perfectly. (Lambda didn't work.) — Sam, Nov 09 '17 at 23:31

Dictionaries in tkinter Python 3

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