Question

当我单击Decimal to Binary按钮时，我收到的错误是ValueError: invalid literal for int() with base 10: ''。

当我点击二进制到十进制按钮时，我也得到ValueError: invalid literal for int() with base 10: 'e'。

以下是所有代码，以便您可以在转换函数本身之外查看错误的位置。对我需要修复的内容以及如何修复它的任何帮助都将非常感激。

import Tkinter

def convertDtoB(binary,left):                  
    if(left>0):                                 
        binary+=str(left%2)                     
        return convertDtoB(binary,left//2)      
    else:
        binary = int(binary[::-1])            
        return binary

def convertBtoD(decimal):                    
    answer = 0                                  
    length = len(str(decimal))                  
    decimal2 = str(decimal)[::-1]               
    for i in range(length):
        answer+=int(decimal2[i])*2**i
    return answer

class simpleapp_tk(Tkinter.Tk):
    def __init__(self,parent):
        Tkinter.Tk.__init__(self,parent)
        self.parent = parent
        self.initialize()

    def initialize(self):
        self.grid()

        self.entryVariable = Tkinter.StringVar()
        self.entry = Tkinter.Entry(self,textvariable=self.entryVariable)

        self.button1 = Tkinter.Button(self, text="Convert Decimal to Binary", command=lambda: self.OnButtonClick(1))
        self.button1.grid(column=1,row=1)

        self.button2 = Tkinter.Button(self, text="Convert Binary to Decimal", command=lambda: self.OnButtonClick(2))
        self.button2.grid(column=1,row=2)

        self.labelVariable = Tkinter.StringVar()
        label = Tkinter.Label(self,textvariable=self.labelVariable, anchor="center", bg="white")
        label.grid(column=1,row=0,columnspan=2,sticky='')
        self.labelVariable.set("Select a conversion.")

        self.grid_columnconfigure(0,weight=1)
        self.resizable(True,False)
        self.update()
        self.geometry(self.geometry())

    def OnButtonClick2(self, button_id):
        if button_id == 3:
            binaryNumber = convertDtoB("",self.decimalNumber)
            self.labelVariable = Tkinter.StringVar()
            label_2 = Tkinter.Label(self,textvariable=self.labelVariable, anchor="center", bg="white")
            label_2.grid(column=1,row=0,columnspan=2,sticky='')
            self.label_2.set(binaryNumber)
        elif button_id == 4:
            binaryNumber = convertBtoD(self.binaryNumber)
            self.labelVariable = Tkinter.StringVar()
            label_2 = Tkinter.Label(self,textvariable=self.labelVariable, anchor="center", bg="white")
            label_2.grid(column=1,row=0,columnspan=2,sticky='')
            self.label_2.set(binaryNumber)

    def OnButtonClick(self, button_id):
        if button_id == 1:
            self.button1.destroy()
            self.button2.destroy()
            self.entryVariable = Tkinter.StringVar()
            self.entry = Tkinter.Entry(self,textvariable=self.entryVariable)
            self.entry.grid(column=1,row=0,sticky='EW')
            self.decimalNumber = self.entryVariable.set("Enter Decimal Number Here")
            self.entry.focus_set()
            self.entry.selection_range(0, Tkinter.END)

            button3 = Tkinter.Button(self, text="Click here to convert", command=lambda: self.OnButtonClick(3))
            button3.grid(column=1,row=1)

            self.OnButtonClick2(3)

        elif button_id == 2:
            self.button1.destroy()
            self.button2.destroy()
            self.entryVariable = Tkinter.StringVar()
            self.entry = Tkinter.Entry(self,textvariable=self.entryVariable)
            self.entry.grid(column=1,row=0,sticky='EW')
            self.binaryNumber = self.entryVariable.set("Enter Binary Number Here.")
            self.entry.focus_set()
            self.entry.selection_range(0, Tkinter.END)

            button4 = Tkinter.Button(self, text="Click here to convert", command=lambda: self.OnButtonClick(4))
            button4.grid(column=1,row=1)

            self.OnButtonClick2(4)


if __name__ == "__main__":
    app = simpleapp_tk(None)
    app.title('my application')
app.mainloop()

Answer 1

代码中存在许多错误，其主要部分位于第65行至第68行，类似地位于第80行至第83行

    self.entryVariable = Tkinter.StringVar()
    self.entry = Tkinter.Entry(self,textvariable=self.entryVariable)
    self.entry.grid(column=1,row=0,sticky='EW')
    self.decimalNumber = self.entryVariable.set("Enter Decimal Number Here")

这里设置输入框以使用变量self.entryVariable而不是self.decimalNumber。 StingVar对象的set方法是就地方法，并不返回任何有用的东西（它返回none作为所有inplace方法）。因此，self.decimalNumber变量实际上从不引用StringVar对象。以下是修复此代码和其他一些错误的代码.. XD

def OnButtonClick2(self, button_id):
    if button_id == 3:
        binaryNumber = convertDtoB("",int(self.entryVariable.get()))
        self.labelVariable = Tkinter.StringVar()
        label_2 = Tkinter.Label(self,textvariable=self.labelVariable, anchor="center", bg="white")
        label_2.grid(column=1,row=0,columnspan=2,sticky='')
        self.labelVariable.set(binaryNumber)
    elif button_id == 4:
        binaryNumber = convertBtoD(self.entryVariable.get())
        self.labelVariable = Tkinter.StringVar()
        label_2 = Tkinter.Label(self,textvariable=self.labelVariable, anchor="center", bg="white")
        label_2.grid(column=1,row=0,columnspan=2,sticky='')
        self.labelVariable.set(binaryNumber)

def OnButtonClick(self, button_id):
    if button_id == 1:
        self.button1.destroy()
        self.button2.destroy()
        self.entryVariable = Tkinter.StringVar()
        self.entry = Tkinter.Entry(self,textvariable=self.entryVariable)
        self.entry.grid(column=1,row=0,sticky='EW')
        self.entryVariable.set("Enter Decimal Number Here")
        self.entry.focus_set()
        self.entry.selection_range(0, Tkinter.END)

        button3 = Tkinter.Button(self, text="Click here to convert", command=lambda: self.OnButtonClick2(3))
        button3.grid(column=1,row=1)

    elif button_id == 2:
        self.button1.destroy()
        self.button2.destroy()
        self.entryVariable = Tkinter.StringVar()
        self.entry = Tkinter.Entry(self,textvariable=self.entryVariable)
        self.entry.grid(column=1,row=0,sticky='EW')
        self.entryVariable.set("Enter Binary Number Here.")
        self.entry.focus_set()
        self.entry.selection_range(0, Tkinter.END)

        button4 = Tkinter.Button(self, text="Click here to convert", command=lambda: self.OnButtonClick2(4))
        button4.grid(column=1,row=1)

Answer 2

考虑这个电话

binaryNumber = convertDtoB("",self.decimalNumber)

这将调用convertDtoB，其中decimal的值为空字符串。这最终会传递给int并最终评估int('')，从而导致您遇到错误。

您需要使convertDtoB对空字符串具有弹性或将调用代码更改为不传递

为什么我收到值错误

2 个答案: