tkinter - Python says I don't have attribute when I do -
this question has answer here:
so i'm pretty new coding , i'm trying make simple menu program tkinter let user click on food items , display his/her total.
when run program python says attributeerror: 'menu' object has no attribute 'potato_skins'. when take out "potato skins" says not have attribute of bread, , on , forth.
can please me, here code:
#order up! #restaurant menu lets user pick foods, show overall price tkinter import * class menu(frame): """menu let's user choose food , shows total price.""" def __init__(self, master): """initialize frame""" super(menu, self).__init__(master) self.grid() self.menu_widgets() def menu_widgets(self): """create menu items.""" #appetizer label label(self, text = "choose appetizers:" ).grid(row = 0, column = 0, sticky = w) #appetizer checkbuttons self.motzerella_sticks = booleanvar() checkbutton(self, text = "mozzerella sticks, $5", variable = self.motzerella_sticks, command = self.update_total() ).grid(row = 1, column = 1, sticky = w) self.potato_skins = booleanvar() checkbutton(self, text = "potato skins, $7", variable = self.potato_skins, command = self.update_total() ).grid(row = 1, column = 1, sticky = w) self.bread = booleanvar() checkbutton(self, text = "bread, $0", variable = self.bread, command = self.update_total() ).grid(row = 1, column = 2, sticky = w) #entree label label(self, text = "pick entree:" ).grid(row = 2, column = 0, sticky = w) #entree checkbuttons self.chicken = booleanvar() checkbutton(self, text = "chicken , brocolli, $10", variable = self.chicken, command = self.update_total() ).grid(row = 3, column = 0, sticky = w) self.soup = booleanvar() checkbutton(self, text = "brocolli cheddar soup, $12", variable = self.soup, command = self.update_total() ).grid(row = 3, column = 1, sticky = w) self.pasta = booleanvar() checkbutton(self, text = "alfredo pasta, $15", variable = self.pasta, command = self.update_total() ).grid(row = 3, column = 2, sticky = w) #dessert label label(self, text = "choose dessert:" ).grid(row = 4, column = 0, sticky = w) #dessert checkbuttons self.cake = booleanvar() checkbutton(self, text = "chocolate cake, $15", variable = self.cake, command = self.update_total() ).grid(row = 5, column = 0, sticky = w) self.brownie = booleanvar() checkbutton(self, text = "brownies, $13", variable = self.brownie, command = self.update_total() ).grid(row = 5, column = 1, sticky = w) #create text box display total self.total_txt = text(self, width = 40, height = 5, wrap = word) self.total_txt.grid(row = 6, column = 0, columnspan = 2, sticky = w) def update_total(self): """show total""" total = 0 if self.motzerella_sticks.get(): total += 5 if self.potato_skins.get(): total += 7 if self.bread.get(): total += 0 if self.chicken.get(): total += 10 if self.soup.get(): total += 12 if self.pasta.get(): total += 15 if self.cake.get(): total += 15 if self.brownie.get(): total += 13 self.total_txt.delete(0.0, end) self.total_txt.insert(0.0, "your total is: ", total) #main root = tk() root.title("menu") app = menu(root) root.mainloop()
the reason execute function instead of passing command parameter.
command = self.update_total() this means executed when creating checkbutton associated self.motzerella_sticks. @ point self.potato_skins not exist.
to fix it, pass function, rather executing it.
command = self.update_total
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