Unable to executing multiple functions using multiprocessing module from a TKinter GUI - python-3.x

Question

Hi I have a small GUI which has a button using which two functions must be executed in different processors. In reality these two functions are heavy calculations. I do not want to use multi threading. I want them to run on 2 different processors. When I try to execute the button, another instance of the GUI gets created and it says
File "C:\Python3.7\lib\multiprocessing\reduction.py", line 60, in dump.
ForkingPickler(file, protocol).dump(obj)
TypeError: can't pickle _tkinter.tkapp objects
My code is as follows.
from multiprocessing import Process
from tkinter import Button, Tk, Frame
class GUI(Frame):
def __init__(self):
super().__init__()
self.button = Button(self, text="Start", command=self.execute)
self.button.pack()
self.pack()
def F1(self):
print("Hello")
def F2(self):
print("World")
def execute(self):
self.P1 = Process(target = self.F1)
self.P2 = Process(target = self.F2)
self.P1.start()
self.P2.start()
self.P1.join()
self.P2.join()
Root = Tk()
Software = GUI()
Root.mainloop()
Please click here

Answer 1

The problem lies with pickling tkinter widgets. You simply cannot do it, as the Tcl interpreter does not understand the python pickle format.
Coming to your code, I tried the following and it prints as expected:
from multiprocessing import Process
from tkinter import Button, Tk, Frame
class GUI(Frame):
def __init__(self):
super().__init__()
self.button = Button(self, text="Start", command=self.execute)
self.button.pack()
self.pack()
#staticmethod
def F1():
print("Hello")
#staticmethod
def F2():
print("World")
def execute(self):
self.P1 = Process(target = GUI.F1())
self.P2 = Process(target = GUI.F2())
self.P1.start()
self.P2.start()
self.P1.join()
self.P2.join()
Root = Tk()
Software = GUI()
Root.mainloop()