I have a food menu and the stock and prices are in separate dictionaries.

Food Stock:

Food_Stock = {'Chips' : 15,'Bagels' : 27,'Cookies' : 25}#Food Stock.

Food Prices:

Food_Prices = {#Food Prices.'Chips' : 1,'Bagels' : 0.5,'Cookies' : 0.4}

Food Menu:

def Food_Menu():#The food menu.Top_Frame = Frame(root)Top_Frame.pack()Bottom_Frame = Frame(root)Bottom_Frame.pack(side = BOTTOM)tree['columns'] = ('Price', 'Qty', 'Print Receipt')#additional columns after the default '#0'tree.column('Price', stretch = 0, width = 100, anchor = E)#Price Column, tkinter.E aligns contents to the "east"tree.column('Qty', stretch = 0, width = 100, anchor = E)#Quantity Columntree.column('Print Receipt', stretch = 0, width = 100, anchor = E)#Print Receipt Columntree.heading('#0', text = "Item")# default column responsible for tree mechanicstree.heading('Price', text = "£")tree.heading('Qty', text = "Quantity")tree.insert('', 0, '_Chips_', values = (Food_Prices['Chips'], Food_Stock['Chips']), text = "Chips")#Parent, text goes to '#0', values go to tree['columns']tree.insert('_Chips_', 0, text = "Add to Order")#Childtree.insert('', 1, '_Bagels_', text = "Bagels", values = (Food_Prices['Bagels'], Food_Stock['Bagels']))#Parent.tree.insert('_Bagels_', 1, Add_Food_Item_To_Order_Button(), text = "Add to Order")#Childtree.insert('', 2, '_Cookies_', text = "Cookies", values = (Food_Prices['Cookies'], Food_Stock['Cookies']))#Parent.tree.insert('_Cookies_', 2, Add_Food_Item_To_Order_Button(), text = "Add to Order")#Childtree.pack()

The GUI displays the stock and price by linking it to the dictionary, or it should if it worked.

The error message:

Exception in Tkinter callback
Traceback (most recent call last):File "C:\Python34\lib\tkinter\__init__.py", line 1533, in __call__
return self.func(*args)File "C:\Users\liam\Documents\BOA\Coursework\Python - Mr Naeem\Comp 4 Practical Project\Bar System.py", line 56, in Food_Button
Food_Menu()File "C:\Users\liam\Documents\BOA\Coursework\Python - Mr Naeem\Comp 4 Practical Project\Bar System.py", line 103, in Food_Menutree.insert('', 0, '_Chips_', values = (Food_Prices['Chips'], Food_Stock['Chips']), text = "Chips")#Parent, text goes to '#0', values go to tree['columns']
TypeError: 'function' object is not subscriptable

Elaboration:

The GUI will display a food menu - def Food_Menu - which has three columns, 'Price', 'Quantity' and 'Print Receipt'.

Then there are trees e.g tree.insert("", 0, 'Chips', values...) that are displayed by accessing the dictionaries Food_Stock and Food_Prices. It calls the data, then is supposed to display it. This means it can adjust to the stock going down or up.

'function' object is not subscriptable means you're doing something like this:

def foo(): pass
something = foo[1]

What this means is that either Food_Prices or Food_Stock is actually a function rather than a variable. It should be easy to figure out which, by adding as simple print statement before the line that is causing the error.

print(Food_Prices, Food_Stock)

Most likely this is because you have a function somewhere else in your code named either Food_Prices or Food_Stock, or you've reassigned the value of one of those variables.