Question

所以我对编码很陌生，我试图用tkinter创建一个简单的菜单程序，让用户点击某些食物项目，它会显示他/她的总数。

当我运行程序时，python说AttributeError: 'Menu' object has no attribute 'potato_skins'。当我拿出＆＃34;土豆皮＆＃34;它说我没有面包的属性，依此类推。

有人可以帮助我，这是代码：

#Order Up!
#restaurant menu that lets the user pick foods, then show overall price

from tkinter import *

class Menu(Frame):
    """Menu that let's the user choose food and shows the total price."""

    def __init__(self, master):
        """Initialize the frame"""
        super(Menu, self).__init__(master)
        self.grid()
        self.menu_widgets()

    def menu_widgets(self):
        """Create all the menu items."""

        #Appetizer Label
        Label(self,
              text = "Choose your 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 your entree:"
              ).grid(row = 2, column = 0, sticky = W)
        #Entree Checkbuttons
        self.chicken = BooleanVar()
        Checkbutton(self,
                    text = "chicken and 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 your 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 a Text box to 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 the 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()

Answer 1

原因是您执行了函数而不是将其作为command参数传递。

command = self.update_total()

这意味着在创建与CheckButton相关联的self.motzerella_sticks时执行此操作。此时self.potato_skins不存在。

要修复它，请传递函数，而不是执行它。

command = self.update_total

Python说我做的时候没有属性

1 个答案: