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I have two python file. I want to change variable value by calling the module.

test.py

import tkinter
from tkinter import *
from tkinter import ttk

class Master(Tk):
 def __init__(self,parent):
 Tk.__init__(self,parent)
 self.initialize()


 def initialize(self):
 self.grid()
 self.my_clock = StringVar(self)
 self.my_clock.set("12:05")

 clock =Label(self,textvariable = self.my_clock,height=1,
 width=5,fg="black",bg="white",font=("Sans", 32,"bold"))

 clock.grid(column=0,row=0,sticky='SW')




window = Master(None)
window.configure(background="white")
window.mainloop()

test1.py

import test
test.window.my_clock.set("13:05")

I could not change the value of my_clock variable from test1.py file.How could I change the value of my_clock variable from test1.py file.

If you want your program test1 to show the window, then it needs to call window.mainloop().

import test
window = test.Master(None)
window.my_clock.set("13:05")
window.mainloop()

You only call the mainloop when you run test.py directly (when __name__ == "__main__"). When you import it you need to run the mainloop again. Change test1.py to:

import test

m = test.Master(None)
m.my_clock.set("13:05")

m.mainloop()

When you do:

import test
test.Master(None).my_clock.set("13:05")

You do the following:

• Import test


• Instanciate a new instance of the class Master (<=> a new object)


• Set a new value for the property my_clock of your new object


• Then this new object "disappear", as it was not stored into a variable.

Two possibilities here:

Instanciate your object in your test.py

test.py

class Master(Tk):
 def __init__(self,parent=None):
 (...)

window = Master()
(...)

test2.py

import test
test.window.my_clock.set("13:05")

Or use a class variable

test.py

class Master(Tk):
 my_clock = StringVar()
 def __init__(self,parent=None):
 (...)

test2.py

import test
test.Master.my_clock.set("13:05")