How to Share Variables Between Different Classes in Tkinter?

How to Access Variables from Different Classes in Tkinter

In the world of Python programming, particularly when working with tkinter for GUI development, one common challenge that arises is how to access variables from different classes. This becomes crucial when you need to share data or communicate between multiple pages or components of your tkinter application.

Consider the following scenario: You have a PageOne class, where users input their email account and password. Subsequently, on PageTwo, you want to utilize this information for advanced tasks, such as sending emails. To achieve this, you need to establish a way to share the email and password variables between these two classes.

Direct Access to PageOne Variable

The simplest approach involves directly accessing the v variable from the PageOne class within the PageTwo class. This can be done through the controller reference available in each page.

page1 = self.controller.get_page(PageOne)
page1_v_value = page1.v.get()

Using Shared Data Structure

A more robust solution is to use a shared data structure within the main SampleApp class. This provides a central location to store and access commonly shared data among all pages.

# In the SampleApp class
self.shared_data = {
    "email": tk.StringVar(),
    "password": tk.StringVar(),
}

# In PageOne class
self.controller.shared_data["email"].set(email_entered)
self.controller.shared_data["password"].set(password_entered)

# In PageTwo class
email_entered = self.controller.shared_data["email"].get()
password_entered = self.controller.shared_data["password"].get()

This strategy allows each page to independently access and manipulate the shared data without directly referencing other pages. It promotes loose coupling and facilitates easier maintenance and modification of the application.

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