Cannot invoke button command: application has been destroyed
python, python-2.7, tk-toolkit, tkinter, user-interface
Solution
Remove `()` from `win1.destroy()` and `win2.destroy()`.
Tkinter.Button(win1, text='Woho!',command=win1.destroy()).pack()
Tkinter.Button(win2, text='Woho!',command=win2.destroy()).pack()
^^
It cause `win1.destroy` method call, and use the return value of the method as callback, instead of the method itself.; cause the main window destroy before Button creation.
Tkinter.Button(win1, text='Woho!',command=win1.destroy).pack()
Tkinter.Button(win2, text='Woho!',command=win2.destroy).pack()
Problem
Given below is the code for creating independent windows using Tkinter and Python: ``` import Tkinter Tkinter.NoDefaultRoot() win1=Tkinter.Tk() win2=Tkinter.Tk() Tkinter.Button(win1, text='Woho!',command=win1.destroy()).pack() Tkinter.Button(win2, text='Woho!',command=win2.destroy()).pack() win1.mainloop() ``` On execution it displays: ``` Traceback (most recent call last): File "C:\Users\Administrator\Desktop\eclipse\Python Projects\Project 1\Source1\mod.py", line 8, in <module> Tkinter.Button(win1, text='Woho!',command=win1.destroy()).pack() File "C:\Python27\lib\lib-tk\Tkinter.py", line 2106, in __init__ Widget.__init__(self, master, 'button', cnf, kw) File "C:\Python27\lib\lib-tk\Tkinter.py", line 2036, in __init__ (widgetName, self._w) + extra + self._options(cnf)) _tkinter.TclError: can't invoke "button" command: application has been destroyed ``` I am new to Python and hence so not understand what it means. Where am I going wrong?