显示当前标签消失前一个 [英] display the current label disappearing the previous

问题描述

我正在尝试一个程序，它将显示在输入框中输入的相应名称的标签.问题:它重叠并显示标签，而不是消失之前的条目标签.请帮我消失之前的条目并显示标签.编码:

I am trying a program,which will display label for the respective name entered in the Entry box. Problem: It overlaps and displays the label,instead of disappearing the previous entry label. Please help me to disappear the previous entry and display the label. Coding:

import Tkinter as tki
class App(object):
     def __init__(self,root):
         self.root = root

         self.txt_frm = tki.Frame(self.root, width=900, height=900)
         self.txt_frm.pack(fill="both", expand=True)
         button3 = tki.Button(self.txt_frm,text="CLICK 1", command = self.retrieve_inpu)
         button3.grid(column=0,row=2)
         self.entry = tki.Entry(self.txt_frm) 
         self.entry.grid(column=1,row=0)

     def retrieve_inpu(self):
        entr = self.entry.get()
        label = tki.Label(self.txt_frm,text=entr)
        label.grid(column=0,row=3)

root = tki.Tk()
app = App(root)
root.mainloop()

推荐答案

您需要保留对标签的引用，并在创建之前对其调用 .destroy() 以摆脱它新标签.

You need to keep a reference to the label, and call .destroy() on it to get rid of it before you create the new Label.

更好的是，如果需要的话，您可以更改文本.尝试使用以下代码代替您自己的代码:

Even better, you could just change the text if that is all the needs to happen. Try the following code in place of your own:

import Tkinter as tki
class App(object):
     def __init__(self,root):
         self.root = root


         self.txt_frm = tki.Frame(self.root, width=900, height=900)
         self.txt_frm.pack(fill="both", expand=True)
         button3 = tki.Button(self.txt_frm,text="CLICK 1", command = self.retrieve_inpu)
         button3.grid(column=0,row=2)
         self.entry = tki.Entry(self.txt_frm) 
         self.entry.grid(column=1,row=0)

         self.label = tki.Label(self.txt_frm)
         self.label.grid(column=0,row=3)

     def retrieve_inpu(self):
        entr = self.entry.get()
        self.label.config(text=entr)

root = tki.Tk()
app = App(root)
root.mainloop()

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