Why Should I Avoid Multiple Tkinter Instances?

Why Are Multiple Instances of Tk Discouraged?

Tkinter, a Python wrapper around Tcl's Tk library, creates an instance of a Tcl interpreter when a root window is created. Each interpreter operates in an isolated sandbox, preventing interactions between objects in different sandboxes.

This isolation can lead to problems, such as:

• StringVar objects created in one interpreter cannot be accessed in another.
• Widgets cannot have parent widgets from different interpreters.
• Images created in one interpreter cannot be used in another.

Therefore, it is generally not advised to have multiple instances of Tk, as it can create unnecessary complications and conflicts.

Alternative: Tkinter within a Loop

The provided second code snippet attempts to avoid having multiple instances of Tk by creating them back-to-back. This method does not resolve the underlying issues mentioned above. It is still considered best practice to create one instance of Tk and utilize Toplevel windows as needed.

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