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 are
- Kivy
- Python Qt
- wxPython
Among all Tkinter is most widely used
Here are some common use cases for Tkinter:
- Creating windows and dialog boxes: Tkinter can be used to create windows and dialog boxes that allow users to interact with your program. These can be used to display information, gather input, or present options to the user.
- Building a GUI for a desktop application: Tkinter can be used to create the interface for a desktop application, including buttons, menus, and other interactive elements.
- Adding a GUI to a command-line program: Tkinter can be used to add a GUI to a command-line program, making it easier for users to interact with the program and input arguments.
- Creating custom widgets: Tkinter includes a variety of built-in widgets, such as buttons, labels, and text boxes, but it also allows you to create your own custom widgets.
- Prototyping a GUI: Tkinter can be used to quickly prototype a GUI, allowing you to test and iterate on different design ideas before committing to a final implementation.
In summary, Tkinter is a useful tool for creating a wide variety of graphical user interfaces, including windows, dialog boxes, and custom widgets. It is particularly well-suited for building desktop applications and adding a GUI to command-line programs.
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:
| Widgets | Description |
|---|---|
| Label | It is used to display text or image on the screen |
| Button | It is used to add buttons to your application |
| Canvas | It is used to draw pictures and others layouts like texts, graphics etc. |
| ComboBox | It contains a down arrow to select from list of available options |
| CheckButton | It displays a number of options to the user as toggle buttons from which user can select any number of options. |
| RadioButton | It is used to implement one-of-many selection as it allows only one option to be selected |
| Entry | It is used to input single line text entry from user |
| Frame | It is used as container to hold and organize the widgets |
| Message | It works same as that of label and refers to multi-line and non-editable text |
| Scale | It is used to provide a graphical slider which allows to select any value from that scale |
| Scrollbar | It is used to scroll down the contents. It provides a slide controller. |
| SpinBox | It is allows user to select from given set of values |
| Text | It allows user to edit multiline text and format the way it has to be displayed |
| Menu | It is used to create all kinds of menu used by an application |
Example
PYTHON
from tkinter import *from tkinter.ttk import * # writing code needs to# create the main window of# the application creating# main window object named rootroot = Tk()# giving title to the main windowroot.title("First_Program")# Label is what output will be# show on the windowlabel = Label(root, text ="Hello World !").pack()# calling mainloop method which is used# when your application is ready to run# and it tells the code to keep displayingroot.mainloop() |
Output 
