python - python Tkinter label changing text value by Button Command

Question

I am using Tkinter Label widget to display some text to my UI Frame and I want the Label to change the text every-time I click the button. In my case I got wrong... it didn't change, is it possible?

This is my code..

currentCounterNumber = "0"

def counterPlus(teller_num):
    #.... the data is working well ....
    data = s.recv(1024) 
    if data:
        currentCounterNumber = data
......
class Content(tk.Frame):
def __init__(self, master, teller_name,*args, **kwargs):
    tk.Frame.__init__(self, *args, borderwidth=20, **kwargs)
    self.L4 = tk.Label(self, text="Serving # " + currentCounterNumber +"!")
    self.L4.pack( side = "top", fill="both", expand=False)      

    self.button1 = tk.Button(self, text="+", width=15, command=lambda: counterPlus(teller_no))
    self.button1.pack(side = "top", fill="both", expand=True)

Answer 1

假设content_obj = Content(....)已定义。

您可以使用以下方法更改文本：

content_obj.L4['text'] = "Serving # {}!".format(currentCounterNumber)

或者

content_obj.L4.configure(text="Serving # {}!".format(currentCounterNumber))
#       OR     config

例子：

from Tkinter import * # Python 3.x: from tkinter import *

def advance():
    lb['text'] = str(int(lb['text']) + 1)
    root.after(1000, advance)

root = Tk()
lb = Label(root, text='0')
lb.pack()
root.after(1000, advance)
root.mainloop()