如何清除Tkinter上“文本”小部件中的文本？

Question

So I made a statusbar on Tkinter and I want there to show up some values. Sometimes that value changes, so I need the statusbar to change to. When I run my program the value shows just fine, but when I change the value and I insert it, the old value stays and the new one is printed next to the old one.

My question is how can I first delete the first one and then add the other one?

from tkinter import *
class lol:

   def __init__(self, window):
       frame = Frame(window)
       frame.grid()

       self.statusbarTotal = Text(window, width= 8, height= 1, bd=1, relief= SUNKEN)
       self.statusbarTotal.grid(row=13, column=0, sticky=W)

       self.presetButton1 = Button(window, text=" 10 ", command=self.preset10)
       self.presetButton1.grid(row=2, column=0)

       self.presetButton2 = Button(window, text=" 30 ", command=self.preset30)
       self.presetButton2.grid(row=2, column=1)


   def preset10(self):
          global waitingTime
          waitingTime = 600
          self.statusbarTotal.insert(13.0, int(waitingTime/60))
          print(waitingTime)

   def preset30(self):
          global waitingTime
          waitingTime = 1800
          self.statusbarTotal.insert(13.0, int(waitingTime/60))
          print(waitingTime)

tk = Tk()
b = lol(tk)
tk.mainloop()

Answer 1

Aside from your indention issues. You need to change:

def preset10(self):
    global waitingTime
    waitingTime = 600
    self.statusbarTotal.insert(13.0, int(waitingTime/60))
    print(waitingTime)

def preset30(self):
    global waitingTime
    waitingTime = 1800
    self.statusbarTotal.insert(13.0, int(waitingTime/60))
    print(waitingTime)

To:

def preset10(self):
    global waitingTime
    waitingTime = 600
    self.statusbarTotal.delete(1.0, END)
    self.statusbarTotal.insert(13.0, int(waitingTime/60))
    print(waitingTime)

def preset30(self):
    global waitingTime
    waitingTime = 1800
    self.statusbarTotal.delete(1.0, END)
    self.statusbarTotal.insert(13.0, int(waitingTime/60))
    print(waitingTime)

However your program shows all the data on one line so I am not sure why you are trying to insert values on the 13th line of the text box. If you can provide context or a better example I can provide a better answer.

However you should really get rid of your global variables all together as this is considered bad programing to use.

Instead your code should use class attributes. Something like this:

from tkinter import *


class lol:

    def __init__(self, window):
        frame = Frame(window)
        frame.grid()
        # uss self. to make a variable name a class attribute
        self.waitingTime = 0

        self.statusbarTotal = Text(window, width= 8, height= 1, bd=1, relief= SUNKEN)
        self.statusbarTotal.grid(row=13, column=0, sticky=W)

        self.presetButton1 = Button(window, text=" 10 ", command=self.preset10)
        self.presetButton1.grid(row=2, column=0)

        self.presetButton2 = Button(window, text=" 30 ", command=self.preset30)
        self.presetButton2.grid(row=2, column=1)


    def preset10(self):
        self.waitingTime = 600
        self.statusbarTotal.delete(1.0, END)
        self.statusbarTotal.insert(13.0, int(self.waitingTime/60))
        print(self.waitingTime)

    def preset30(self):
        self.waitingTime = 1800
        self.statusbarTotal.delete(1.0, END)
        self.statusbarTotal.insert(13.0, int(self.waitingTime/60))
        print(self.waitingTime)

tk = Tk()
b = lol(tk)
tk.mainloop()

Answer 2

Several possibilities.

The first is that insert will, well, insert the new text into the existing text. So you have to use delete to remove the part that you don't want anymore.

Another solution, which is simpler I think, is don't use a Text widget but instead use Label , which allows you to set and replace the text it displays all at once. You can't manually edit the text in a Label widget but I suppose for a status bar that is not what you want anyway.