Tkinter provides many generic widget methods or base widget methods that work with almost all available widgets.
This method is used to test, whether the specified widget is visible or not.
Syntax: widget.winfo_ismapped ()
Return Value: Returns True if widget is visible (or mapped), otherwise returns False.
Exception: If widget is destroyed, then it throws error.
This method is used to check if the specified widget exists or not, i.e. widget destroyed or not.
Syntax: widget.winfo_exists ()
Return value: Returns True if widget exists, False otherwise.
Note: if the widget is destroyed, it cannot be restored again.
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