Class and tkinter problem

[Peter Otten]

On 07/01/2021 08:42, Christian Gollwitzer wrote:
> Am 07.01.21 um 08:29 schrieb Paulo da Silva:
> 
>> Does anybody know why cmd method isn't called when I change the button
>> state (clicking on it) in this example?
>> I know that this seems a weird class use. But why doesn't it work?
>> Thanks.
>>
>> class C:
>>      from tkinter import Checkbutton
>>      import tkinter
>>
>>      @staticmethod
> ^^it works if you remove the staticmethod here
> 
>>      def cmd():
>>          print("Test")
>>
> 
> Maybe there is a bug in tkinter, that it doesn't work with static methods?

It has nothing to do with tkinter, a staticmethod object cannot be 
called directly:

 >>> class C:
	@staticmethod
	def cmd(): print("Hello")
	cmd()

	
Traceback (most recent call last):
   File "<pyshell#28>", line 1, in <module>
     class C:
   File "<pyshell#28>", line 4, in C
     cmd()
TypeError: 'staticmethod' object is not callable

You have to go through the descriptor protocol:

 >>> class C:
	@staticmethod
	def cmd(): print("Hello")

	
 >>> C.cmd()
Hello

I recommend that the OP use a more conventional stye and do the setup 
outside the class or, better, in an instance of the class.