從GUI中的條目計算總數

努力使此代碼在我的 GUI 中作業。我犯了很多錯誤，并試圖從句法上理解我如何才能完成這項作業。我正在嘗試制作一個訂單，其中包含客戶想要的 cookie 數量并計算它們的總數。我知道這肯定是我忽略的一些簡單的事情。

from tkinter import Button, Entry, Label,Tk
from tkinter.messagebox import showinfo

class CookieOrderForm(Tk):

    def __init__(self,parent=None):
        Tk.__init__(self, parent)
        self.title("Cookie Form")
        self.make_widgets()

    def total(self):
        order = sum(int(e.get()) for e in (self.chipEn, self.oatEn, self.oreoEn))
        txt = ("Your Order Total Is: "   str(order))
        self.new.config(text = txt)
        
        

    def make_widgets(self):
        chip = Label(self, text='Chocolate Chip ($1.00)').grid(row=1, column=0)
        self.chipEn = Entry(self)
        self.chipEn.grid(row=1, column=1, columnspan=4)
        oat = Label(self, text='Oatmeal ($1.50)').grid(row=2, column=0)
        self.oatEn = Entry(self)
        self.oatEn.grid(row=2, column=1, columnspan=4)       
        Button(self,text='Order Total', command=lambda:self.total()).grid(row=4, column=2)
        oreo = Label(self, text='Oreo ($2.00)').grid(row=3, column=0)
        self.oreoEn = Entry(self)
        self.oreoEn.grid(row=3, column=1, columnspan=4)
        self.new = Label(self)
        self.new.grid(row=3, column=1)

CookieOrderForm().mainloop()

我認為我的主要問題來自這里的這條線 order = sum(int(e.get()) for e in (self.chipEn, self.oatEn, self.oreoEn))

編輯:::: 錯誤資訊包括

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\17734\AppData\Local\Programs\Python\Python39\lib\tkinter\__init__.py", line 1884, in __call__
    return self.func(*args)
  File "C:\Users\17734\OneDrive\Desktop\fall 2021\csc242\homework\CSC242hw4.py", line 91, in <lambda>
    Button(self,text='Order Total', command=lambda:self.total()).grid(row=4, column=2)
  File "C:\Users\17734\OneDrive\Desktop\fall 2021\csc242\homework\CSC242hw4.py", line 78, in total
    order = sum(int(e.get()) for e in (self.chipEn, self.oatEn, self.oreoEn))
  File "C:\Users\17734\OneDrive\Desktop\fall 2021\csc242\homework\CSC242hw4.py", line 78, in <genexpr>
    order = sum(int(e.get()) for e in (self.chipEn, self.oatEn, self.oreoEn))
ValueError: invalid literal for int() with base 10: ''

uj5u.com熱心網友回復：

僅Entry當您按下 時有空時，您才會收到此錯誤Button。

嘗試int("")，您會看到相同的錯誤。

當您輸入一些文本（如Hello World）而不是數字時，您可能會遇到類似的錯誤。

你可以把sum()在try/except捕獲錯誤。

    def total(self):
        try:
            order = sum(int(e.get()) for e in (self.chipEn, self.oatEn, self.oreoEn))
            txt = ("Your Order Total Is: "   str(order))
        except Exception as ex:
            print('Exception:', ex)
            txt = 'Your have wrong values in Order'

        self.new.config(text = txt)

最終，您應該將每個值分別轉換為單獨的值，try/catch以查看哪個Entry值錯誤并顯示具有更好資訊的訊息。

uj5u.com熱心網友回復：

這可能不是最好的解決方案，但它有效。添加功能以檢查您的輸入是否為數字，如果不是則回傳，0如果是則回傳int

from tkinter import Button, DoubleVar, Entry, Label, StringVar,Tk
from tkinter.messagebox import showinfo


class CookieOrderForm(Tk):

    def __init__(self,parent=None):
        Tk.__init__(self, parent)
        self.title("Cookie Form")
        self.make_widgets()

    def entryIsDigit(self, number: str) -> int:
        if number.isdigit() == True:
            return int(number)
        return 0

    def total(self):
        order = sum(e for e in (self.entryIsDigit(self.chipEn.get()), self.entryIsDigit(self.oatEn.get()), self.entryIsDigit(self.oreoEn.get())))
        txt = ("Your Order Total Is: "   str(order))
        self.new.config(text = txt)
        
        

    def make_widgets(self):
        chip = Label(self, text='Chocolate Chip ($1.00)').grid(row=1, column=0)
        self.chipEn = Entry(self)
        self.chipEn.grid(row=1, column=1, columnspan=4)
        oat = Label(self, text='Oatmeal ($1.50)').grid(row=2, column=0)
        self.oatEn = Entry(self)
        self.oatEn.grid(row=2, column=1, columnspan=4)       
        Button(self,text='Order Total', command=lambda:self.total()).grid(row=4, column=2)
        oreo = Label(self, text='Oreo ($2.00)').grid(row=3, column=0)
        self.oreoEn = Entry(self)
        self.oreoEn.grid(row=3, column=1, columnspan=4)
        self.new = Label(self)
        self.new.grid(row=3, column=1)

CookieOrderForm().mainloop()```

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