Question

python的tkinter问题

python版本2.7

# _*_coding:UTF-8 _*_

from Tkinter import *

var = StringVar()

on_hit = False

def hit_me():

global on_hit

if on_hit:

on_hit = True

var.set('you hit me !!!')

else:

on_hit = False

var.set('')

window = Tk.Tk()

window.title('This is GUI')

window.geometry('1000x1000')

l = Tk.Label(window , textvariable = var , bg = 'red',font = '宋体',width = 15,height = 2)

l.pack()

b = Tk.Button(window , text ='hit me',width = 15,height = 2,command = hit_me)

b.pack()

window.mainloop()

Traceback (most recent call last):
File "F:\python\homework\GUI.py", line 5, in <module>
var = StringVar()
File "C:\Python27\lib\lib-tk\Tkinter.py", line 341, in __init__
Variable.__init__(self, master, value, name)
File "C:\Python27\lib\lib-tk\Tkinter.py", line 241, in __init__
self._root = master._root()
AttributeError: 'NoneType' object has no attribute '_root'

Answer 1

# _*_coding:UTF-8 _*_

import Tkinter as tk

on_hit = True

def hit_me():

    global on_hit
    if on_hit:
        on_hit = False
        var.set('you hit me !!!')
    else:
        on_hit = True
        var.set('')

window = tk.Tk()
var = tk.StringVar()   #不要写上面
window.title('This is GUI')
window.geometry('1000x1000')
l = tk.Label(window , textvariable = var , bg = 'red',font = '宋体',width = 15,height = 2)
l.pack()
b = tk.Button(window , text ='hit me',width = 15,height = 2,command = hit_me)
b.pack()
window.mainloop()