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Python自动售货机错误订单咖啡未定义

分类：编程问答

如何解决Python自动售货机错误订单咖啡未定义

我要按类别对食物进行分类，设置类别，然后选择食物。我希望选择食物后总价上涨。订购咖啡部分对我来说是个问题。咖啡菜单与其他类别重叠。另外，如果我按下订单完成按钮，我想要一张带有感谢信息的收据。我该怎么办？

我的错误信息是

The menu you entered does not exist.
Exception in Tkinter callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/tkinter/__init__.py",line 1883,in __call__
    return self.func(*args)
  File "/Users/mason/PycharmProjects/APCSP/APCSP.py",line 174,in <lambda>
    btn_drink_1 = tk.Button(frame3,text="Iced Coffee\n($2.65)",padx="10",pady="10",width="10",command=lambda: drink_add('Iced Coffee'))
  File "/Users/mason/PycharmProjects/APCSP/APCSP.py",line 60,in drink_add
    total_price += this_price
TypeError: unsupported operand type(s) for +=: 'float' and 'nonetype'

这是我的代码

price_meal = {"Donut": 1.25,"Filled Donut": 1.50,"Apple Fritter": 2.95,"Cinnamon roll": 2.95,"Muffin": 2.95,"Scone": 2.95}
price_drink = {"Hot Tea": 1.95,"Hot Chocolate": 1.75,"Milk": 1.50,"Chocolate Milk": 1.95,"Soda": 2.25}
price_coffees = {"Iced Coffee": 2.65,"Cold Brew": 3.95,"Iced Americano" :2.45,"Mochatella":4.25,"Iced Mochatella": 4.75,"Cafe Caramel/Mocha": 4.70}

order_meal = {}
order_drink = {}
order_coffees = {}

total_price = 0


def show_meal():
    btn_meal.configure(bg="yellow")
    btn_drink.configure(bg="white")
    frame4.pack_forget()
    frame3.pack_forget()
    frame2.pack(fill="both",expand=True)
    frame4.pack(fill="both",expand=True)

def show_drink():
    btn_meal.configure(bg="white")
    btn_drink.configure(bg="yellow")
    frame4.pack_forget()
    frame2.pack_forget()
    frame3.pack(fill="both",expand=True)

def show_coffees():
    btn_meal.configure(bg="white")
    btn_drink.configure(bg="yellow")
    frame4.pack_forget()
    frame2.pack_forget()
    frame3.pack(fill="both",expand=True)


def meal_add(m):
    global price_meal,order_meal,total_price
    if m not in price_meal:
        print("The menu you entered does not exist.")
    this_price = price_meal.get(m)
    total_price += this_price

    if m in order_meal:
        order_meal[m] = order_meal.get(m) + 1
    else:
        order_meal[m] = 1
    print_order()
    print_price()


def drink_add(m):
    global price_drink,order_drink,total_price
    if m not in price_drink:
        print("The menu you entered does not exist.")
    this_price = price_drink.get(m)
    total_price += this_price

    if m in order_drink:
        order_drink[m] = order_drink.get(m) + 1
    else:
        order_drink[m] = 1
    print_order()
    print_price()


def coffees_add(m):
    global price_coffees,order_coffees,total_price
    if m not in price_coffees:
        print("The menu you entered does not exist.")
    this_price = price_coffees.get(m)
    total_price += this_price

    if m in order_coffees:
        order_drink[m] = order_coffees.get(m) + 1
    else:
        order_coffees[m] = 1
    print_order()
    print_price()


def print_order():
    global order_meal,order_coffees

    tmp = ""
    price_tmp = 0
    for i in order_meal:
        price_tmp = price_meal[i] * order_meal.get(i)
        tmp = tmp + i + " X " + str(order_meal.get(i)) +  " = " + str(price_tmp)+"\n"
    for i in order_drink:
        price_tmp = price_drink[i] * order_drink.get(i)
        tmp = tmp + i + " X " + str(order_drink.get(i)) +  " = " + str(price_tmp)+"\n"
    for i in order_coffees:
        price_tmp = price_coffees[i] * order_coffees.get(i)
        tmp = tmp + i + " X " + str(order_coffees.get(i)) +  " = " + str(price_tmp)+"\n"

    text_1.delete('1.0',tk.END)
    text_1.insert(tk.INSERT,tmp)


def order_end():
    global total_price,order_coffees
    total_price = 0
    del order_meal
    del order_drink
    del order_coffees

    order_meal = {}
    order_drink = {}
    order_coffees = {}
    print_price()
    print_order()
    show_meal()


def print_price():
    global total_price
    label_price.configure(text=str(total_price))


window = tk.Tk()
window.title("Brunch Cafe")
window.geometry("800x400+500+300")
window.resizable(False,False)

frame1 = tk.Frame(window,width="800",height="10")
frame1.pack(fill="both")

frame2 = tk.Frame(window,width="800")
frame2.pack(fill="both",expand=True)

frame3 = tk.Frame(window,width="800")
frame3.pack(fill="both",expand=True)

frame4 = tk.Frame(window,width="800")
# frame4.pack(fill="both",expand=True)

frame5 = tk.Frame(window,height="10")
frame5.pack(fill="both",expand=True)

btn_meal = tk.Button(frame1,text="meal",bg="yellow",command=show_meal)
btn_meal.grid(row=0,column=0,padx=10,pady=10)

btn_drink = tk.Button(frame1,text="drinks",bg="white",command=show_drink)
btn_drink.grid(row=0,column=1,pady=10)

btn_end = tk.Button(frame1,text="Order Completed",command=order_end)
btn_end.grid(row=0,column=2,pady=10)

label_price = tk.Label(frame1,text="0 dollars",width="20",fg="blue",font='Arial 15')
label_price.grid(row=0,column="3",pady="10")

# Meal
btn_meal_1 = tk.Button(frame2,text="Donut\n($1.25)",command=lambda: meal_add('Donut'))
btn_meal_1.grid(row=0,pady=10)

btn_meal_2 = tk.Button(frame2,text="Filled Donut\n($1.50)",command=lambda: meal_add('Filled Donut'))
btn_meal_2.grid(row=0,pady=10)

btn_meal_3 = tk.Button(frame2,text="Cinnamon roll\n($2.95)",command=lambda: meal_add('Cinnamon roll'))
btn_meal_3.grid(row=0,pady=10)

btn_meal_4 = tk.Button(frame2,text="Muffin\n($2.95)",command=lambda: meal_add('Muffin'))
btn_meal_4.grid(row=0,column=3,pady=10)

btn_meal_5 = tk.Button(frame2,text="Scone\n($2.95)",command=lambda: meal_add('Scone'))
btn_meal_5.grid(row=0,column=4,pady=10)


# Coffees
btn_drink_1 = tk.Button(frame3,command=lambda: drink_add('Iced Coffee'))
btn_drink_1.grid(row=0,pady=10)

btn_drink_2 = tk.Button(frame3,text="Cold Brew\n($3.95)",command=lambda: drink_add('Cold Brew'))
btn_drink_2.grid(row=0,pady=10)

btn_drink_3 = tk.Button(frame3,text="Iced Americano\n($2.45)",command=lambda: drink_add('Iced Americano'))
btn_drink_3.grid(row=0,pady=10)

btn_drink_4 = tk.Button(frame3,text="Mochatella\n($4.25)",command=lambda: drink_add('Mochatella'))
btn_drink_4.grid(row=0,pady=10)

btn_drink_6 = tk.Button(frame3,text="Iced Mochatella\n($4.75)",command=lambda: drink_add('Iced Mochatella'))
btn_drink_6.grid(row=0,pady=10)

btn_drink_7 = tk.Button(frame3,text="Cafe Caramel/Mocha\n($4.70)",command=lambda: drink_add('Cafe Caramel/Mocha'))
btn_drink_7.grid(row=0,pady=10)


# Drinks
btn_drink_1 = tk.Button(frame4,text="Hot Tea\n($1.95)",command=lambda: drink_add('Hot Tea'))
btn_drink_1.grid(row=0,pady=10)

btn_drink_2 = tk.Button(frame4,text="Hot Chocolate\n($1.75)",command=lambda: drink_add('Hot Chocolate'))
btn_drink_2.grid(row=0,pady=10)

btn_drink_3 = tk.Button(frame4,text="Milk\n($1.50)",command=lambda: drink_add('Milk'))
btn_drink_3.grid(row=0,pady=10)

btn_drink_4 = tk.Button(frame4,text="Soda\n($2.25)",command=lambda: drink_add('Soda'))
btn_drink_4.grid(row=0,pady=10)


# Order list
text_1 = tk.Text(frame5,height="10")
text_1.pack()

window.mainloop()

解决方法

错误告诉您 this_price 是 None。为什么会这样？

好吧，如果我们检查 the documentation 的 .get 方法：

None 如果未找到键且未指定值。

在您的代码中，您没有将值传递给 .get() 方法。参数是[key,value]，你没有传值。

因此，将 this_price = price_meal.get(m) 换成 this_price = price_meal[str(m)]，您将获得值，这正是您想要的。

您将使用 slice notation 而不是使用 .get。 Python 会在字典中查找 m，当它找到 m 时，它会返回字典中 m 的值，即价格。

您的整个代码如下所示：

price_meal = {"Donut": 1.25,"Filled Donut": 1.50,"Apple Fritter": 2.95,"Cinnamon roll": 2.95,"Muffin": 2.95,"Scone": 2.95}
price_drink = {"Hot Tea": 1.95,"Hot Chocolate": 1.75,"Milk": 1.50,"Chocolate Milk": 1.95,"Soda": 2.25}
price_coffees = {"Iced Coffee": 2.65,"Cold Brew": 3.95,"Iced Americano" :2.45,"Mochatella":4.25,"Iced Mochatella": 4.75,"Cafe Caramel/Mocha": 4.70}

order_meal = {}
order_drink = {}
order_coffees = {}

total_price = 0


def show_meal():
    btn_meal.configure(bg="yellow")
    btn_drink.configure(bg="white")
    frame4.pack_forget()
    frame3.pack_forget()
    frame2.pack(fill="both",expand=True)
    frame4.pack(fill="both",expand=True)

def show_drink():
    btn_meal.configure(bg="white")
    btn_drink.configure(bg="yellow")
    frame4.pack_forget()
    frame2.pack_forget()
    frame3.pack(fill="both",expand=True)

def show_coffees():
    btn_meal.configure(bg="white")
    btn_drink.configure(bg="yellow")
    frame4.pack_forget()
    frame2.pack_forget()
    frame3.pack(fill="both",expand=True)


def meal_add(m):
    global price_meal,order_meal,total_price
    if m not in price_meal:
        print("The menu you entered does not exist.")
    this_price = price_meal[m]
    total_price += this_price

    if m in order_meal:
        order_meal[m] = order_meal[m] + 1
    else:
        order_meal[m] = 1
    print_order()
    print_price()


def drink_add(m):
    global price_drink,order_drink,total_price
    if m not in price_drink:
        print("The menu you entered does not exist.")
    this_price = price_drink[m]
    total_price += this_price

    if m in order_drink:
        order_drink[m] = order_drink[m] + 1
    else:
        order_drink[m] = 1
    print_order()
    print_price()


def coffees_add(m):
    global price_coffees,order_coffees,total_price
    if m not in price_coffees:
        print("The menu you entered does not exist.")
    this_price = price_coffees[m]
    total_price += this_price

    if m in order_coffees:
        order_drink[m] = order_coffees[m] + 1
    else:
        order_coffees[m] = 1
    print_order()
    print_price()


def print_order():
    global order_meal,order_coffees

    tmp = ""
    price_tmp = 0
    for i in order_meal:
        price_tmp = price_meal[i] * order_meal[i]
        tmp = tmp + i + " X " + str(order_meal[i]) +  " = " + str(price_tmp)+"\n"
    for i in order_drink:
        price_tmp = price_drink[i] * order_drink[i]
        tmp = tmp + i + " X " + str(order_drink[i]) +  " = " + str(price_tmp)+"\n"
    for i in order_coffees:
        price_tmp = price_coffees[i] * order_coffees[i]
        tmp = tmp + i + " X " + str(order_coffees[i]) +  " = " + str(price_tmp)+"\n"

    text_1.delete('1.0',tk.END)
    text_1.insert(tk.INSERT,tmp)


def order_end():
    global total_price,order_coffees
    total_price = 0
    del order_meal
    del order_drink
    del order_coffees

    order_meal = {}
    order_drink = {}
    order_coffees = {}
    print_price()
    print_order()
    show_meal()


def print_price():
    global total_price
    label_price.configure(text=str(total_price))

import tkinter as tk
window = tk.Tk()
window.title("Brunch Cafe")
window.geometry("800x400+500+300")
window.resizable(False,False)

frame1 = tk.Frame(window,width="800",height="10")
frame1.pack(fill="both")

frame2 = tk.Frame(window,width="800")
frame2.pack(fill="both",expand=True)

frame3 = tk.Frame(window,width="800")
frame3.pack(fill="both",expand=True)

frame4 = tk.Frame(window,width="800")
# frame4.pack(fill="both",expand=True)

frame5 = tk.Frame(window,height="10")
frame5.pack(fill="both",expand=True)

btn_meal = tk.Button(frame1,text="meal",padx="10",pady="10",bg="yellow",command=show_meal)
btn_meal.grid(row=0,column=0,padx=10,pady=10)

btn_drink = tk.Button(frame1,text="drinks",bg="white",command=show_drink)
btn_drink.grid(row=0,column=1,pady=10)

btn_end = tk.Button(frame1,text="Order Completed",command=order_end)
btn_end.grid(row=0,column=2,pady=10)

label_price = tk.Label(frame1,text="0 dollars",width="20",fg="blue",font='Arial 15')
label_price.grid(row=0,column="3",pady="10")

# Meal
btn_meal_1 = tk.Button(frame2,text="Donut\n($1.25)",width="10",command=lambda: meal_add('Donut'))
btn_meal_1.grid(row=0,pady=10)

btn_meal_2 = tk.Button(frame2,text="Filled Donut\n($1.50)",command=lambda: meal_add('Filled Donut'))
btn_meal_2.grid(row=0,pady=10)

btn_meal_3 = tk.Button(frame2,text="Cinnamon roll\n($2.95)",command=lambda: meal_add('Cinnamon roll'))
btn_meal_3.grid(row=0,pady=10)

btn_meal_4 = tk.Button(frame2,text="Muffin\n($2.95)",command=lambda: meal_add('Muffin'))
btn_meal_4.grid(row=0,column=3,pady=10)

btn_meal_5 = tk.Button(frame2,text="Scone\n($2.95)",command=lambda: meal_add('Scone'))
btn_meal_5.grid(row=0,column=4,pady=10)


# Coffees
btn_drink_1 = tk.Button(frame3,text="Iced Coffee\n($2.65)",command=lambda: drink_add('Iced Coffee'))
btn_drink_1.grid(row=0,pady=10)

btn_drink_2 = tk.Button(frame3,text="Cold Brew\n($3.95)",command=lambda: drink_add('Cold Brew'))
btn_drink_2.grid(row=0,pady=10)

btn_drink_3 = tk.Button(frame3,text="Iced Americano\n($2.45)",command=lambda: drink_add('Iced Americano'))
btn_drink_3.grid(row=0,pady=10)

btn_drink_4 = tk.Button(frame3,text="Mochatella\n($4.25)",command=lambda: drink_add('Mochatella'))
btn_drink_4.grid(row=0,pady=10)

btn_drink_6 = tk.Button(frame3,text="Iced Mochatella\n($4.75)",command=lambda: drink_add('Iced Mochatella'))
btn_drink_6.grid(row=0,pady=10)

btn_drink_7 = tk.Button(frame3,text="Cafe Caramel/Mocha\n($4.70)",command=lambda: drink_add('Cafe Caramel/Mocha'))
btn_drink_7.grid(row=0,pady=10)


# Drinks
btn_drink_1 = tk.Button(frame4,text="Hot Tea\n($1.95)",command=lambda: drink_add('Hot Tea'))
btn_drink_1.grid(row=0,pady=10)

btn_drink_2 = tk.Button(frame4,text="Hot Chocolate\n($1.75)",command=lambda: drink_add('Hot Chocolate'))
btn_drink_2.grid(row=0,pady=10)

btn_drink_3 = tk.Button(frame4,text="Milk\n($1.50)",command=lambda: drink_add('Milk'))
btn_drink_3.grid(row=0,pady=10)

btn_drink_4 = tk.Button(frame4,text="Soda\n($2.25)",command=lambda: drink_add('Soda'))
btn_drink_4.grid(row=0,pady=10)


# Order list
text_1 = tk.Text(frame5,height="10")
text_1.pack()

window.mainloop()

请注意，我基本上用 dictionary.get(m) 替换了 dictionary[m] 的每个实例。

,

这是因为您已将 drink_add() 用于所有咖啡项目。改用 coffees_add()：

# Coffees
btn_drink_1 = tk.Button(frame3,command=lambda: coffees_add('Iced Coffee'))
btn_drink_1.grid(row=0,command=lambda: coffees_add('Cold Brew'))
btn_drink_2.grid(row=0,command=lambda: coffees_add('Iced Americano'))
btn_drink_3.grid(row=0,command=lambda: coffees_add('Mochatella'))
btn_drink_4.grid(row=0,command=lambda: coffees_add('Iced Mochatella'))
btn_drink_6.grid(row=0,text="Cafe Caramel\n/Mocha\n($4.70)",command=lambda: coffees_add('Cafe Caramel/Mocha'))
btn_drink_7.grid(row=0,column=5,pady=10)

请注意，我还将 column=4 的 column=5 更改为 btn_drink_7。您还为 coffees 和 drinks 使用了相同的变量名称集。

coffees_add() 中的以下块中有错字：

if m in order_coffees:
    order_drink[m] = order_coffees.get(m) + 1   # <- order_coffees[m] should be used instead
else:
    order_coffees[m] = 1

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