为什么在按下 "Reset" 按钮时我的标签无法清除?

Why can't I get my labels to clear when the "Reset" button is pressed?

我正在制作一个程序,将公里转换为英里,将英里转换为公里。当显示值时,我希望有一个重置按钮来重置值和用户编号。

我可以输入要清除的数字,但不能输入标签(finalKilo、finalMile)。有什么建议吗?

此外,有没有其他方法可以不使用标签来显示计算值?

from tkinter import *

def closeWin():
   myGui.destroy()                   #Close Window Function

def kiloFunc():
    myText = kiloMent.get()          #Kilometers to Miles Fuction
    convert = 0.62
    miles = myText * convert
    finalKilo = Label(text = miles,fg='red',justify='center').place(x=200,y=80)


def mileFunc():
    myText2 = mileMent.get()         #Miles to Kilometers Function
    convertTwo = myText2 // 0.62    
    finalMile = Label(text = convertTwo, fg = 'red',justify='center').place(x=200,y=170)


def reset_values():
    kiloMent.set(0)
    mileMent.set(0)      #Resets the Data
    finalKilo.set("")
    finalMile.set("")



       #The GUI


myGui = Tk()

kiloMent = IntVar()
mileMent = IntVar()

myGui.title("Distance Converter")
myGui.geometry("450x200+500+200")

myLabel = Label(text="Welcome! Please enter your value then choose your option:",fg="blue",justify='center')
myLabel.pack()

kiloEntry = Entry(myGui, textvariable =   kiloMent,justify='center').pack()

kilo2milesButton = Button(text = "Kilometers to Miles!", command =     kiloFunc).pack()

mileEntry = Entry(myGui, textvariable =     mileMent,justify='center').place(x=130,y=105)

miles2kiloButton = Button(text = "Miles to Kilometers!", command = mileFunc).place(x=150,y=135)

reset = Button(text = "Reset Values!", command = reset_values).place(x=10,y=165)

quit = Button(text="Quit", command = closeWin).place(x=385,y=165)

myGui.mainloop()

与其在每次转换上创建新标签,不如为结果创建一个标签,而不是 text,为其分配一个 textvariable,它是 [=12= 的一个实例].在该变量上,您可以调用 set 来更改与该变量关联的标签的文本,

Callidior 是正确的,有多个错误:)

我已经调整了代码,将它放在 class 中,现在它应该可以工作了。

现在它在尝试更改标签时引用实际变量(miles 和 convertTwo)。您提到了标签本身。在那种情况下,您可能应该做类似的事情:

finalKilo.config(text = "")
finalMile.config(text = "")

另一个问题是您仅在输入条目后才定义标签,而在重置时您将两者都重置了。因此,如果第一次只给出一个条目并按下重置,则会弹出一条错误消息,指出其中一个标签不是 defined/None.

下面的代码应该可以工作。

from Tkinter import *

class hisGui:

    def __init__(self):
        self.myGui = Tk()

        self.kiloMent = IntVar()
        self.mileMent = IntVar()


        self.myGui.title("Distance Converter")
        self.myGui.geometry("450x200+500+200")

        myLabel = Label(text="Welcome! Please enter your value then choose your option:",fg="blue",justify='center')
        myLabel.pack()

        self.miles = StringVar()
        self.convertTwo = StringVar()
        self.finalKilo = Label(textvariable = self.miles,fg='red',justify='center').place(x=200,y=80)
        self.finalMile = Label(textvariable = self.convertTwo, fg = 'red',justify='center').place(x=200,y=170)

        kiloEntry = Entry(self.myGui, textvariable =   self.kiloMent,justify='center').pack()

        kilo2milesButton = Button(text = "Kilometers to Miles!", command =     self.kiloFunc).pack()

        mileEntry = Entry(self.myGui, textvariable =     self.mileMent,justify='center').place(x=130,y=105)

        miles2kiloButton = Button(text = "Miles to Kilometers!", command = self.mileFunc).place(x=150,y=135)

        reset = Button(text = "Reset Values!", command = self.reset_values).place(x=10,y=165)

        quit = Button(text="Quit", command = self.closeWin).place(x=385,y=165)

        self.myGui.mainloop()

    def closeWin(self):
        self.myGui.destroy()                   #Close Window Function

    def kiloFunc(self):
        myText = self.kiloMent.get()          #Kilometers to Miles Function
        convert = 0.62
        self.miles.set(myText * convert)

    def mileFunc(self):
        myText2 = self.mileMent.get()         #Miles to Kilometers Function
        self.convertTwo.set(myText2 // 0.62)

    def reset_values(self):
        self.kiloMent.set(0)
        self.mileMent.set(0)      #Resets the Data
        self.miles.set("")
        self.convertTwo.set("")

if __name__ == '__main__':
    Gui = hisGui()