Flask By Example

Flask By Example

By : Gareth Dwyer

Buy this Book

Flask By Example

By: Gareth Dwyer

Buy this Book

Overview of this book

This book will take you on a journey from learning about web development using Flask to building fully functional web applications. In the first major project, we develop a dynamic Headlines application that displays the latest news headlines along with up-to-date currency and weather information. In project two, we build a Crime Map application that is backed by a MySQL database, allowing users to submit information on and the location of crimes in order to plot danger zones and other crime trends within an area. In the final project, we combine Flask with more modern technologies, such as Twitter's Bootstrap and the NoSQL database MongoDB, to create a Waiter Caller application that allows restaurant patrons to easily call a waiter to their table. This pragmatic tutorial will keep you engaged as you learn the crux of Flask by working on challenging real-world applications.

Flask By Example

Credits

About the Author

Acknowledgements

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Hello, World!

Introducing Flask

Creating our development environment

Writing "Hello, World!"

Deploying our application to production

Summary

Getting Started with Our Headlines Project

Setting up our project and a Git repository

Creating a new Flask application

Introduction to RSS and RSS feeds

Summary

Using Templates in Our Headlines Project

Introducing Jinja

Basic use of Jinja templates

Advanced use of Jinja templates

Summary

User Input for Our Headlines Project

Getting user input using HTTP GET

Getting user input using HTTP POST

Adding weather and currency data

Summary

Improving the User Experience of Our Headlines Project

Adding cookies to our Headlines application

Adding CSS to our Headlines application

Summary

Building an Interactive Crime Map

Setting up a new Git repository

Understanding relational databases

Installing and configuring MySQL on our VPS

Creating our Crime Map database in MySQL

Creating a basic database web application

Summary

Adding Google Maps to Our Crime Map Project

Running a database application locally

Adding an embedded Google Maps widget to our application

Adding an input form for new crimes

Displaying existing crimes on our map

Summary

Validating User Input in Our Crime Map Project

Choosing where to validate

Trying out an XSS example

Validating and sanitizing

Summary

Building a Waiter Caller App

Setting up a new Git repository

Using Bootstrap to kick-start our application

Adding user account control to our application

Summary

Template Inheritance and WTForms in Waiter Caller Project

Adding the Account and Dashboard pages

Shortening URLs using the bitly API

Adding functionality to handle attention requests

Adding user feedback with WTForms

Summary

Using MongoDB with Our Waiter Caller Project

Introducing MongoDB

Installing MongoDB

Using the MongoDB shell

Introducing PyMongo

Testing our application in production

Adding some finishing touches

Summary

A Sneak Peek into the Future

Expanding the projects

Expanding your Flask knowledge

Expanding your web development knowledge

Summary

Index

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Adding functionality to handle attention requests

We need to deal with two aspects of attention requests. The first, as discussed earlier, is to create new requests when a user visits a URL. The second is to allow the waiters of the restaurant to view these requests and mark them as resolved.

Writing the attention request code

When a user visits a URL, we should create an attention request and store it in the database. This attention request should contain:

The time the request was made
The table from which the request was made

As before, we'll just use a Python dictionary to represent the attention request object. We need to have our application code create new attention requests and allow these requests to be added, retrieved, and deleted from the database.

Adding the attention request route

Add the following route to waitercaller.py:

@app.route("/newrequest/<tid>")
def new_request(tid):
  DB.add_request(tid, datetime.datetime.now())
  return "Your request has been logged and a waiter will...

Flask By Example

By : Gareth Dwyer

Flask By Example

By: Gareth Dwyer

Overview of this book

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Current Title:

Flask By Example

Adding functionality to handle attention requests

Writing the attention request code

Adding the attention request route