How to reference variables present in other classes using Python's Tkinter?

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You can reference variables present in other classes in Tkinter by creating an instance of the class and accessing the variable using the instance object.

Here's an example:

import tkinter as tk

class MyClass:
    def __init__(self):
        self.my_variable = "Hello World!"

class GUI(tk.Tk):
    def __init__(self, my_class_instance):
        super().__init__()
        self.my_class_instance = my_class_instance
        self.my_label = tk.Label(self, text=self.my_class_instance.my_variable)
        self.my_label.pack()

if __name__ == "__main__":
    my_class_instance = MyClass()
    my_gui = GUI(my_class_instance)
    my_gui.mainloop()

In this example, there are two classes: MyClass and GUI. MyClass contains a variable called my_variable. In the GUI class, a label widget is created with the value of my_class_instance.my_variable as its text. In the if __name__ == "__main__" block, an instance of MyClass is created and passed to an instance of GUI as an argument.

By accessing my_class_instance.my_variable in the GUI class, we are able to reference the my_variable present in MyClass.