Question

正如标题所说，我想在点击按钮时删除按钮。我尝试了很多不同的风格，这个似乎是最简单的，但我不断收到错误：

line 34, in incorrect
    button2.Button.destroy()
NameError: name 'button2' is not defined

当尝试如下所示的不同方法时，这一个：

NameError: name 'button2' is not defined

尝试在开头定义时，我会收到此错误：

UnboundLocalError: local variable 'button2' referenced before assignment

非常感谢任何帮助，谢谢。

我的代码：

from tkinter import *

class Application(object):
     def __init__(self):
          self.root = Tk()
          self.root.configure(bg="darkorchid1", padx=10, pady=10)
          self.root.title("WELCOME TO THIS PROGRAM)")

    self.username = "Bob"

    program = Label(self.root, text="MY PROGRAM", bg="lightgrey", fg="darkorchid1")
    program.pack()

    label0 = Label(self.root, text="ENTER USERNAME:", bg="purple", fg="white", height=5, width=50)
    label0.pack()

    self.entry = Entry(self.root, width=25)
    self.entry.configure(fg= "white",bg="grey20")
    self.entry.pack()

    button = Button(self.root, text="SUBMIT", highlightbackground="green", width=48, command=self.correct)
    button.pack()

def correct(self):
    username = self.entry.get()
    if username == self.username:
        button1 = Button(self.root, text='LOGIN', highlightbackground="green", width=28, command=self.root.destroy)
        button1.pack()
    elif username != self.username:
       button2 = Button(self.root, text="INCORRECT- CLICK TO DIMISS THIS MESSAGE", highlightbackground="red", width=48, command=self.incorrect)
       button2.pack()

def incorrect(self):
    button2.destroy() 



app=Application()

mainloop()

Answer 1

将您的button - 变量存储在一个类中，或者只是将它们传递给您的函数。由于button2超出范围，您遇到了问题！

请改为尝试：

   def correct(self):
        username = self.entry.get()
        if username == self.username:
            self.button1 = Button(self.root, text='LOGIN', highlightbackground="green",
                                  width=28, command=self.root.destroy)
            self.button1.pack()
        elif username != self.username:
            self.button2 = Button(self.root,
                                  text="INCORRECT- CLICK TO DIMISS THIS MESSAGE",
                                  highlightbackground="red", width=48,
                                  command=self.incorrect)
            self.button2.pack()

    def incorrect(self):
        self.button2.destroy()

一旦点击，如何设置Tkinter按钮擦除？

1 个答案: