The purpose of this book is to introduce readers with little to no programming experience, to Python Graphical User Interface (GUI). A GUI application can be created in any programming language, say VB.Net, C#.Net etc. In this book, we shall see how to create a GUI application using Python tkinter library. We will provide the readers with the foundational knowledge and skills which is required to start writing code for creating any desktop GUI app in Python language. By mastering Python tkinter library, readers will be able to apply this technology to solve real-world problems and create various useful applications according to their needs. The first part of the book covers basic GUI tkinter concepts followed by a touch of inbuilt variable classes for creating different tkinter GUI widgets. Then we shall see some insights of different widgets viz button, input, display, container, item and user-interactive widgets. Finally, in the later part of the book, we shall explore handling file selection and getting widget along with trace information in tkinter. This book covers a wide range of topics, from basic definition of different widgets along with various solved examples and well explanatory code. Overall, the book provides a solid foundation for beginners to start their journey for getting trained in python GUI using tkinter library