Malhar Lathkar - Building Web Apps with Python and Flask: Learn to Develop and Deploy Responsive RESTful Web Applications Using Flask Framework (English Edition)

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Building

Web Apps with

Python and Flask

Learn to Develop and Deploy Responsive

RESTful Web Applications Using Flask Framework

Malhar Lathkar

www.bpbonline.com

FIRST EDITION 2021

Copyright BPB Publications, India

ISBN: 978-93-89898-835

All Rights Reserved. No part of this publication may be reproduced, distributed or transmitted in any form or by any means or stored in a database or retrieval system, without the prior written permission of the publisher with the exception to the program listings which may be entered, stored and executed in a computer system, but they can not be reproduced by the means of publication, photocopy, recording, or by any electronic and mechanical means.

LIMITS OF LIABILITY AND DISCLAIMER OF WARRANTY

The information contained in this book is true to correct and the best of authors and publishers knowledge. The author has made every effort to ensure the accuracy of these publications, but publisher cannot be held responsible for any loss or damage arising from any information in this book.

All trademarks referred to in the book are acknowledged as properties of their respective owners but BPB Publications cannot guarantee the accuracy of this information.

Distributors:

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Published by Manish Jain for BPB Publications, Ansari Road, Darya Ganj, New Delhi-110002 and Printed by him at Repro India Ltd, Mumbai

www.bpbonline.com

Dedicated to

All my teachers,

their profound influence has made me a lifelong learner

Beautiful is better than ugly.

Explicit is better than implicit.

Simple is better than complex.

Complex is better than complicated.

Flat is better than nested.

Sparse is better than dense.

Now is better than never.

Although never is often better than right now.

-- from The Zen of Python,

by Tim Peters

About the Author

Malhar Lathkar is an independent software professional, corporate trainer, freelance technical writer, and Subject Matter Expert with an experience of more than three decades. He has trained hundreds of students/professionals in Python, Data Science, Java and Android, PHP and web development, etc.

He also has the experience of delivering talks and conducting workshops on various IT topics. He writes regularly in a local newspaper on sports and technology-related current topics.

He is the author of the following books:

Computer Fundamentals, Software Concepts & Programming in BASIC: 1995

Ten in One: Handbook of Multilingual Programming: 2016

Python Data Persistence: With SQL and NoSQL Databases: 2019

Currently, he is working as the Director of the Institute of Programming Language Studies (Rama Computers), Nanded, Maharashtra.

https://www.linkedin.com/in/malharlathkar

About the Reviewer

Arun Kumar Gupta is a professional programmer. He is currently working as a Sr. Technical Lead in a leading multinational company. He has been developing software since 2010. He has worked with Python, using Flask/Django to build APIs/web applications/Microservices in e-commerce, health care, retail, and machine learning. He completed his Masters in Computer Applications (MCA) in 2010. When not at work, he enjoys spending time with his kids, and reading about new technologies.

Acknowledgement

First and foremost, I would like to express my gratitude from the bottom of my heart to BPB Publishers for giving me this opportunity to write this book. I am also grateful to BPBs editorial team, especially Mr. Arun Kumar Gupta the technical reviewer, for their invaluable suggestions during the course of finalization of the manuscript.

My previous work Python Data Persistence with SQL and NoSQL Databases was also published by BPB in 2019, and it had an encouraging response. I am sure this book will also be equally well received by BPBs knowledgeable readers.

Most of this book has been written in the work-from-home scenario arising because of the Covid pandemic-induced lockdown, which means I had to encroach upon my wifes workspace! I thank her sincerely for being so accommodating! I would like to remain indebted to all my friends and family members who have always been appreciative and supportive.

Teaching is the best way of consolidating your knowledge of the subject. It helps in simplifying even the difficult concepts. I take this opportunity to thank all my students as well for being a part of my academic journey.

Finally, a big thank you to everyone involved in the making of this book!

Preface

In recent years, Python has established itself as one of the most popular programming languages. Although, the surge in its popularity is on account of its application in the field of Data Science and analytics, the Python-based web framework has become the preferred choice of a majority of web application developers worldwide.

Pythons WSGI compliant framework is hugely popular among the Python developer community despite being fairly young (the first version of Flask was released only in 2010). Despite being classified as a micro framework, its extensible nature makes it very easy to interact with any database, template engine, form library, etc. In fact, the tagline of Flask as it appears on its official logo development, one drop at a summarizes its philosophy very succinctly.

Admittedly, there are quite a few books on Flask. However, most of them have a tutorial-like approach. This book, on the other hand, aims to ease the reader with the process of web application development, starting from the basics of HTTP protocol, right up to how to deploy a Flask application on publicly visible servers.

How the book is organized?

Although, the reader is expected to have a reasonable proficiency in Python, a concise cheat sheet to help refresh Python skills is provided in the form of an appendix. Any web application technology needs the knowledge of front-end tools such as JavaScript and CSS. Their detailed discussion is beyond the scope of this book. However, a very brief introduction to these languages is given in Chapter 6: Static

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