Graphical User Interface(GUI) is a form of user interface which allows users to interact with computers through visual indicators using items such as icons, menus, windows, etc. It has advantages over the Command Line Interface(CLI) where users interact with computers by writing commands using keyboard only and whose usage is more difficult than GUI.

What is Tkinter?

Tkinter is the inbuilt python module that is used to create GUI applications. It is one of the most commonly used modules for creating GUI applications in Python as it is simple and easy to work with. You don’t need to worry about the installation of the Tkinter module separately as it comes with Python already. It gives an object-oriented interface to the Tk GUI toolkit.

Some other Python Libraries available for creating our own GUI applications areKivyPython QtwxPython

Among all Tkinter is most widely used

What are Widgets?

Widgets in Tkinter are the elements of GUI application which provides various controls (such as Labels, Buttons, ComboBoxes, CheckBoxes, MenuBars, RadioButtons and many more) to users to interact with the application.

Fundamental structure of tkinter program

Basic Tkinter Widgets:

LabelIt is used to display text or image on the screen
ButtonIt is used to add buttons to your application
CanvasIt is used to draw pictures and others layouts like texts, graphics etc.
ComboBoxIt contains a down arrow to select from list of available options
CheckButtonIt displays a number of options to the user as toggle buttons from which user can select any number of options.
RadiButtonIt is used to implement one-of-many selection as it allows only one option to be selected
EntryIt is used to input single line text entry from user
FrameIt is used as container to hold and organize the widgets
MessageIt works same as that of label and refers to multi-line and non-editable text
ScaleIt is used to provide a graphical slider which allows to select any value from that scale
ScrollbarIt is used to scroll down the contents. It provides a slide controller.
SpinBoxIt is allows user to select from given set of values
TextIt allows user to edit multiline text and format the way it has to be displayed
MenuIt is used to create all kinds of menu used by an application

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