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Home > Web Development > Server Side Web Development > Flask Framework Cookbook
Flask Framework Cookbook
Flask Framework Cookbook

Flask Framework Cookbook: Over 80 hands-on recipes to help you create small-to-large web applications using Flask

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Profile Icon Shalabh Aggarwal
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€35.99
Full star icon Full star icon Full star icon Full star icon Half star icon 4.3 (4 Ratings)
Paperback Nov 2014 258 pages 1st Edition
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Arrow left icon
Profile Icon Shalabh Aggarwal
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€35.99
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Paperback Nov 2014 258 pages 1st Edition
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€25.99 €28.99
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Flask Framework Cookbook

Chapter 2. Templating with Jinja2

This chapter will cover the basics of Jinja2 templating from the perspective of Flask; we will also learn how to make applications with modular and extensible templates.

In this chapter, we will cover the following recipes:

  • Bootstrap layout
  • Block composition and layout inheritance
  • Creating a custom context processor
  • Creating a custom Jinja2 filter
  • Creating a custom macro for forms
  • Advanced date and time formatting

Introduction

In Flask, we can write a complete web application without the need of any third-party templating engine. For example, have a look at the following code; this is a simple Hello World application with a bit of HTML styling included:

from flask import Flask
app = Flask(__name__)

@app.route('/')
@app.route('/hello')
@app.route('/hello/<user>')
def hello_world(user=None):
    user = user or 'Shalabh'
    return '''
<html>
    <head>
      <title>Flask Framework Cookbook</title>

    </head>
      <body>
        <h1>Hello %s!</h1>
        <p>Welcome to the world of Flask!</p>
      </body>
</html>''' % user

if __name__ == '__main__':
    app.run()

Is the preceding pattern of writing the application feasible in the case of large applications that involve thousands of lines of HTML, JS, and CSS code? Obviously not!

Here, templating...

Bootstrap layout

Most of the applications in Flask follow a specific pattern to lay out templates. In this recipe, we will talk about the recommended way of structuring the layout of templates in a Flask application.

Getting ready

By default, Flask expects the templates to be placed inside a folder named templates at the application root level. If this folder is present, then Flask will automatically read the contents by making the contents of this folder available for use with the render_template() method, which we will use extensively throughout this book.

How to do it…

Let's demonstrate this with a small application. This application is very similar to the one we developed in Chapter 1, Flask Configurations. The first thing to do is add a new folder named templates under my_app. The application structure will now look like the following lines of code:

flask_app/
    - run.py
    my_app/
        – __init__.py
        - hello/
            - __init__.py
            - views...

Block composition and layout inheritance

Usually, any web application will have a number of web pages that will be different from each other. Code blocks such as headers and footers will be the same in almost all the pages throughout the site. Likewise, the menu also remains the same. In fact, usually, just the center container block changes, and the rest usually remains the same. For this, Jinja2 provides a great way of inheritance among templates.

It's a good practice to have a base template where we can structure the basic layout of the site along with the header and footer.

Getting ready

In this recipe, we will try to create a small application where we will have a home page and a product page (such as the ones we see on e-commerce stores). We will use the Bootstrap framework to give a minimalistic design to our templates. Bootstrap can be downloaded from http://getbootstrap.com/.

Here, we have a hardcoded data store for a few products placed in the models.py file. These are read in...

Creating a custom context processor

Sometimes, we might want to calculate or process a value directly in the templates. Jinja2 maintains a notion that the processing of logic should be handled in views and not in templates, and thus, it keeps the templates clean. A context processor becomes a handy tool in this case. We can pass our values to a method; this will then be processed in a Python method, and our resultant value will be returned. Therefore, we are essentially just adding a function to the template context (thanks to Python for allowing us to pass around functions just like any other object).

How to do it…

Let's say we want to show the descriptive name of the product in the format Category / Product-name:

@product_blueprint.context_processor:
def some_processor():
    def full_name(product):
        return '{0} / {1}'.format(product['category'], product['name'])
    return {'full_name': full_name}

A context is simply a dictionary...

Creating a custom Jinja2 filter

After looking at the previous recipe, experienced developers might think that it was stupid to use a context processor to create a descriptive product name. We can simply write a filter to get the same result; this will make things much cleaner. A filter can be written to display the descriptive name of the product as shown here:

@product_blueprint.template_filter('full_name')
def full_name_filter(product):
    return '{0} / {1}'.format(product['category'], product['name'])

This can be used as follows:

{{ product|full_name }}

The preceding code will yield a similar result as it did in the previous recipe.

How to do it…

To take things to a higher level, let's create a filter to format the currency based on the current local language:

import ccy
from flask import request

@app.template_filter('format_currency')
def format_currency_filter(amount):
    currency_code = ccy.countryccy(request.accept_languages...

Introduction

In Flask, we can write a complete web application without the need of any third-party templating engine. For example, have a look at the following code; this is a simple Hello World application with a bit of HTML styling included:

from flask import Flask
app = Flask(__name__)

@app.route('/')
@app.route('/hello')
@app.route('/hello/<user>')
def hello_world(user=None):
    user = user or 'Shalabh'
    return '''
<html>
    <head>
      <title>Flask Framework Cookbook</title>

    </head>
      <body>
        <h1>Hello %s!</h1>
        <p>Welcome to the world of Flask!</p>
      </body>
</html>''' % user

if __name__ == '__main__':
    app.run()

Is the preceding pattern of writing the application feasible in the case of large applications that involve thousands of lines of HTML, JS, and CSS code? Obviously not!

Here, templating saves us because we can structure our view code by keeping our templates separate...

Bootstrap layout

Most of the applications in Flask follow a specific pattern to lay out templates. In this recipe, we will talk about the recommended way of structuring the layout of templates in a Flask application.

Getting ready

By default, Flask expects the templates to be placed inside a folder named templates at the application root level. If this folder is present, then Flask will automatically read the contents by making the contents of this folder available for use with the render_template() method, which we will use extensively throughout this book.

How to do it…

Let's demonstrate this with a small application. This application is very similar to the one we developed in Chapter 1, Flask Configurations. The first thing to do is add a new folder named templates under my_app. The application structure will now look like the following lines of code:

flask_app/
    - run.py
    my_app/
        – __init__.py
        - hello/
            - __init__.py
            - views.py
        - templates...
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Description

If you are a web developer who wants to learn more about developing applications in Flask and scale them with industry-standard practices, this is the book for you. This book will also act as a handy tool if you are aware of Flask's major extensions and want to make the best use of them. It is assumed that you have knowledge of Python and a basic understanding of Flask. If you are completely new to Flask, reading the book from the first chapter and going forward will help in getting acquainted with Flask as you go ahead.

What you will learn

  • Configure Flask in the best way to suit your application needs
  • Integrate Flask with technologies such as Redis, Sentry, and MongoDB
  • Integrate your applications with most of the login mechanisms available
  • Write beautiful RESTful applications
  • Create an admin interface for your application
  • Learn about efficient and effective debugging, logging, and error handling in Flask
  • Test your applications as you write them to prevent future complications
  • Implement fulltext search for effective user query handling
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Nov 21, 2014
Length: 258 pages
Edition : 1st
Language : English
ISBN-13 : 9781783983407
Category :
Web Development
Languages :
Python
Concepts :
Server Side Web Development
Tools :
Flask

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Publication date : Nov 21, 2014
Length: 258 pages
Edition : 1st
Language : English
ISBN-13 : 9781783983407
Category :
Web Development
Languages :
Python
Concepts :
Server Side Web Development
Tools :
Flask

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Flask Framework Cookbook
Flask Framework Cookbook
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Table of Contents

13 Chapters
1. Flask Configurations Chevron down icon Chevron up icon
1. Flask Configurations
Introduction
Environment setup with virtualenv
Handling basic configurations
Class-based settings
Organization of static files
Being deployment specific with instance folders
Composition of views and models
Creating a modular web app with blueprints
Making a Flask app installable using setuptools
2. Templating with Jinja2 Chevron down icon Chevron up icon
2. Templating with Jinja2
Introduction
Bootstrap layout
Block composition and layout inheritance
Creating a custom context processor
Creating a custom Jinja2 filter
Creating a custom macro for forms
Advanced date and time formatting
3. Data Modeling in Flask Chevron down icon Chevron up icon
3. Data Modeling in Flask
Introduction
Creating a SQLAlchemy DB instance
Creating a basic product model
Creating a relational category model
Database migration using Alembic and Flask-Migrate
Model data indexing with Redis
Opting the NoSQL way with MongoDB
4. Working with Views Chevron down icon Chevron up icon
4. Working with Views
Introduction
Writing function-based views and URL routes
Class-based views
URL routing and product-based pagination
Rendering to templates
Dealing with XHR requests
Decorator to handle requests beautifully
Creating custom 404 and 500 handlers
Flashing messages for better user feedback
SQL-based searching
5. Webforms with WTForms Chevron down icon Chevron up icon
5. Webforms with WTForms
Introduction
SQLAlchemy model data as form representation
Validating fields on the server side
Creating a common forms set
Creating custom fields and validation
Creating a custom widget
Uploading files via forms
Cross-site Request Forgery protection
6. Authenticating in Flask Chevron down icon Chevron up icon
6. Authenticating in Flask
Introduction
Simple session-based authentication
Authenticating using the Flask-Login extension
Using OpenID for authentication
Using Facebook for authentication
Using Google for authentication
Using Twitter for authentication
7. RESTful API Building Chevron down icon Chevron up icon
7. RESTful API Building
Introduction
Creating a class-based REST interface
Creating an extension-based REST interface
Creating a SQLAlchemy-independent REST API
A complete REST API example
8. Admin Interface for Flask Apps Chevron down icon Chevron up icon
8. Admin Interface for Flask Apps
Introduction
Creating a simple CRUD interface
Using the Flask-Admin extension
Registering models with Flask-Admin
Creating custom forms and actions
WYSIWYG for textarea integration
Creating user roles
9. Internationalization and Localization Chevron down icon Chevron up icon
9. Internationalization and Localization
Introduction
Adding a new language
Lazy evaluation and the gettext/ngettext functions
Global language-switching action
10. Debugging, Error Handling, and Testing Chevron down icon Chevron up icon
10. Debugging, Error Handling, and Testing
Introduction
Setting up basic file logging
Sending e-mails on the occurrence of errors
Using Sentry to monitor exceptions
Debugging with pdb
Creating our first simple test
Writing more tests for views and logic
Nose library integration
Using mocking to avoid real API access
Determining test coverage
Using profiling to find bottlenecks
11. Deployment and Post Deployment Chevron down icon Chevron up icon
11. Deployment and Post Deployment
Introduction
Deploying with Apache
Deploying with uWSGI and Nginx
Deploying with Gunicorn and Supervisor
Deploying with Tornado
Using Fabric for deployment
S3 storage for file uploads
Deploying with Heroku
Deploying with AWS Elastic Beanstalk
Application monitoring with Pingdom
Application performance management and monitoring with New Relic
12. Other Tips and Tricks Chevron down icon Chevron up icon
12. Other Tips and Tricks
Introduction
Full-text search with Whoosh
Full-text search with Elasticsearch
Working with signals
Using caching with your application
E-mail support for Flask applications
Understanding asynchronous operations
Working with Celery
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.3
(4 Ratings)
5 star 50%
4 star 25%
3 star 25%
2 star 0%
1 star 0%
Martin Jan 07, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Kurze beispiele die Praxis relevant sind und viel wiederkehrende aufgaben kurz und gut erklären.Preis leistung stimmen. Der inhalt ist nicht so einfach zusammen zu googlen so das ich das Buch jederzeit wieder Kaufen würde.
Amazon Verified review Amazon
Neil Goldman Nov 30, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I also own the Flask Web Development book, and was worried there would be a lot of overlap in content, because that's also written with a cookbook-ish style. But I'm very happy with this purchase, it goes very in depth and provides several alternative ways to build parts your application. It also covers more advanced "real-world" topics, like caching, logging/monitoring in production, and deploying to a variety of different servers and platforms.Like any other cookbook, most of the content can be found by searching Google or SO, but it's worth it to me to have a book of well-written examples to things I encounter frequently.The Kindle edition is well formatted and readable on my paperwhite and the desktop app just fine.
Amazon Verified review Amazon
William P Ross Jul 27, 2016
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This is a well written recipe book for intermediate and advanced users of Flask. It assumes you already know Python and have used Flask before. I found the topics to be wide ranging, and each recipe is usually 1-5 pages long.The primary example app used throughout the book is a catalog of digital products. In the beginning are recipes were dedicated to setting up the page and displaying the products, such as showing an iPhone and its price. Later items focused on things like using a database, caching, and searching. This example worked well because many modern websites are displaying different items, and a lot of the examples could be easily adapated to another application.Writing in the book is intelligent, and the order is well structed. One thing was the author deferred to often to online documentation at the end of recipes rather than just making the recipe longer. I think certain sections needed more of a meta-view or summary than just purely having the recipes. For example, chapter 11 is about deployment. It is less than 30 pages long but covers: Apache, uSWGI, Nginx, Gunicorn, Supervisor, Tornado, Fabricc, S3, Heroku, AWS Elastic Beanstalk, Pingdom, and New Relic. This was just too many topics to try and introduce all at once, and there was no indication as to which would be the best deployment service for most users; or what to use in specific cases.Overall this book has a lot of value for Flask users and I would read this author again.
Amazon Verified review Amazon
Jerry W. Feb 21, 2015
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Although the book was coherently written, the kindle version was not adequately formatted for copying and pasting source code straight from the book. Because of this, I cannot give more than three stars.
Amazon Verified review Amazon

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About the author

Profile icon Shalabh Aggarwal
Shalabh Aggarwal
Shalabh Aggarwal is a seasoned engineering leader who develops and manages enterprise systems and web and mobile applications for small- and large-scale organizations. He started his career working with Python, and although he now works on multiple technologies, he remains a Python developer at heart. He is passionate about open source technologies and writes highly readable and high-quality code. Throughout his career, he has built software products and engineering teams for companies moving from 0 to 1, 1 to 10, and 10 to 100 levels. He is also active in voluntary training for engineering students and young engineers on non-conventional and open source topics. When not working with full-time assignments, he consults for start-ups on starting or scaling up while leveraging different technologies. When not writing code, he dedicates his time to his young kid and occasional travels.
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Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela