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<!DOCTYPE html>

<head>

<title>Flask - Full Stack Python</title>

<!--[if lt IE 9]>

<![endif]-->

</head>

<body>

<h2 style="color: #fff; margin: 20px 40px 0 0;"><a href="https://www.gumroad.com/l/python-deployments" style="color: #fff">The Full Stack Python Guide to Deployments book</a> has been released!</h2>

</div>

</div> <a href="https://github.com/makaimc/fullstackpython.com"><img style="position: absolute; top: 0; right: 0; border: 0;" src="/theme/img/fork.png" alt="Fork me on GitHub"></a>

<span class="logo-title"><a href="/">Full Stack Python</a></span>

</div>

</div><div class="row">

<h1>Flask</h1>

<p><a href="http://flask.pocoo.org/">Flask</a> is a Python web framework built with a

<a href="http://flask.pocoo.org/docs/design/">small core and easy-to-extend philosophy</a>.

<h2>Why is Flask a good web framework choice?</h2>

<p>Flask is considered more

<a href="http://blog.startifact.com/posts/older/what-is-pythonic.html">Pythonic</a>

than Django because Flask web application code is in most cases more explicit.

Flask is easy to get started with as a beginner because there is little

boilerplate code for getting a simple app up and running. </p>

<p>For example, here's a valid "hello world" web application with Flask (the

equivalent in Django would be significantly more code):</p>

<div class="highlight"><pre><span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">Flask</span>

<span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="n">__name__</span><span class="p">)</span>

<span class="nd">@app.route</span><span class="p">(</span><span class="s">'/'</span><span class="p">)</span>

<span class="k">def</span> <span class="nf">hello_world</span><span class="p">():</span>

<span class="k">return</span> <span class="s">'Hello World!'</span>

</pre></div>

<p>Flask was also written several years after Django and therefore

learned from the Python community's reactions as the framework evolved.

Jökull Sólberg wrote a great piece articulating to this effect in his

<a href="http://jokull.calepin.co/my-flask-to-django-experience.html">experience switching between Flask and Django</a>.</p>

If you're learning about Flask you should also understand

<a href="/web-frameworks.html">web frameworks</a> and read

how to <a href="/deployment.html">deploy web applications</a>.

</div>

<h2>Flask resources</h2>

<ul>

<li>

<p>The Flask mega tutorial by

<a href="https://twitter.com/miguelgrinberg">Miguel Grinberg</a> is a perfect

starting resource for using this web framework. Each post focuses on a

single topic and builds on previous posts. The series includes 18 parts:

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world">#1 Hello World</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-ii-templates">#2 Templates</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-iii-web-forms">#3 Web Forms</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-iv-database">#4 Database</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-v-user-logins">#5 User Logins</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-vi-profile-page-and-avatars">#6 Profile Page and Avatars</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-vii-unit-testing">#7 Unit Testing</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-viii-followers-contacts-and-friends">#8 Followers, Contacts, and Friends</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-ix-pagination">#9 Pagination</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-x-full-text-search">#10 Full Text Search</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xi-email-support">#11 Email Support</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xii-facelift">#12 Facelift</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xiii-dates-and-times">#13 Dates and Times</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xiv-i18n-and-l10n">#14 I18n and L10n</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xv-ajax">#15 Ajax</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xvi-debugging-testing-and-profiling">#16 Debugging, Testing and Profiling</a>,

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xvii-deployment-on-linux-even-on-the-raspberry-pi">#17 Deployment on Linux</a>

and

<a href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xviii-deployment-on-the-heroku-cloud">#18 Deployment on the Heroku Cloud</a>.

Miguel also wrote the

<a href="http://shop.oreilly.com/product/0636920031116.do">O'Reilly Flask Web Development</a>

book which is also an excellent learning resource.</p>

</li>

<li>

<p>If you're looking for a fun tutorial with Flask and WebSockets, check out

my blog post on creating

<a href="https://www.twilio.com/blog/2014/11/choose-your-own-adventure-presentations-with-reveal-js-python-and-websockets.html">Choose Your Own Adventure Presentations with Reveal.js, Python and WebSockets</a>.

Follow up that tutorial by

<a href="https://www.twilio.com/blog/2015/03/choose-your-own-adventures-presentations-wizard-mode-part-1-of-3.html">building an admin interface in part 1</a>,

and <a href="https://www.twilio.com/blog/2015/07/choose-your-own-adventure-presentations-flask-reveal-js-websockets.html">part 3</a>

that'll show you how to use forms and SQLAlchemy. There is also a

companion open source

<a href="https://github.com/makaimc/choose-your-own-adventure-presentations">GitHub repository</a>

for the app with

in the blog posts.</p>

</li>

<li>

<p>This <a href="https://www.twilio.com/blog/2015/09/warm-phone-call-transfers-with-python-flask-and-twilio-voice.html">simple Flask app uses Twilio Voice</a>

to do voice calling with three participants. It's a fun introduction

to Python and Flask I wrote for the Twilio blog.</p>

</li>

<li>

<p><a href="http://tutsbucket.com/tutorials/building-a-blog-using-flask-and-angularjs-part-1/">Building a blog using Flask and AngularJS Part 1</a>

is the first of a multipart series on working with Flask and an AngularJS

front end.

and

are also available

<a href="https://github.com/basco-johnkevin/building-a-blog-using-flask-and-angularjs">along with the source code</a>.</p>

</li>

<li>

<p><a href="http://flask.pocoo.org/extensions/">The Flask Extensions Registry</a> is a

curated list of the best packages that extend Flask. It's the first location

to look through when you're wondering how to do something that's not in the

core framework.</p>

</li>

<li>

<p><a href="http://exploreflask.com/">Explore Flask</a> is a public domain book that

was previously backed on Kickstarter and cost money for about a year before

being open sourced. The book explains best practices and patterns for

building Flask apps.</p>

</li>

<li>

<p><a href="http://mattupstate.com/python/2013/06/26/how-i-structure-my-flask-applications.html">How I Structure My Flask Application</a>

walks through how this developer organizes the components and architecture

for his Flask applications.</p>

</li>

<li>

<p>Nice post by Jeff Knupp on <a href="http://www.jeffknupp.com/blog/2014/01/29/productionizing-a-flask-application/">Productionizing a Flask App</a>.</p>

</li>

<li>

<p><a href="http://maximebf.com/blog/2012/10/building-websites-in-python-with-flask/#.U06EZ-ZdW4J">Building Websites in Python with Flask</a>

is another walkthrough tutorial from first steps through

<a href="http://maximebf.com/blog/2012/11/getting-bigger-with-flask/">getting bigger with Flask</a>.</p>

</li>

<li>

<p>The Plank & Whittle blog has two posts, one on

<a href="http://www.plankandwhittle.com/packaging-a-flask-web-app/">Packaging a Flask web app</a>

and another on

<a href="http://www.plankandwhittle.com/packaging-a-flask-app-in-a-debian-package/">Packaging a Flask app in a Debian package</a>

once you've built an app and want to deploy it.</p>

</li>

<li>

<p>The Tuts+ <a href="http://code.tutsplus.com/tutorials/an-introduction-to-pythons-flask-framework--net-28822">Flask tutorial</a>

is another great walkthrough for getting started with the framework.</p>

</li>

<li>

<p><a href="http://readwrite.com/2014/07/11/one-click-messaging-app">Create Your Own Obnoxiously Simple Messaging App Just Like Yo</a>

is a silly walkthrough of very basic Flask web application that uses

<a href="https://www.nitrous.io/">Nitrous.io</a> to get started and

<a href="https://www.twilio.com/">Twilio</a> for SMS.</p>

</li>

<li>

<p>The blog post series "Things which aren't magic" covers how Flask's

ubiquitous @app.route decorator works under the covers. There are two

parts in the series,

and

</li>

<li>

<p><a href="http://www.realpython.com/blog/python/flask-by-example-part-1-project-setup/">Flask by Example: Part 1</a>

shows the basic first steps for setting up a Flask project.

explains how to use PostgreSQL, SQLAlchemy and Alembic.

describes text processing with BeautifulSoup and NLTK.

shows how to build a task queue with Flask and Redis.</p>

</li>

<li>

<p><a href="https://www.twilio.com/blog/2014/10/branded-mms-coupon-generation-with-python-and-twilio.html">Branded MMS Coupon Generation with Python and Twilio</a>

is a Flask tutorial I wrote for building a web application that can send

branded barcode coupons via MMS. The post goes through every step from

a blank directory until you have a working app that you can deploy to

Heroku.</p>

</li>

<li>

<p><a href="https://www.digitalocean.com/community/articles/how-to-structure-large-flask-applications">How to Structure Large Flask Applications</a>

covers a subject that comes up quickly once you begin adding significant

functionality to your Flask application.</p>

</li>

<li>

<p><a href="http://fewstreet.com/2015/01/16/flask-blueprint-templates.html">Flask Blueprint templates</a>

shows a way of structuring your <code>__init__.py</code> file with

<a href="http://flask.pocoo.org/docs/0.10/blueprints/">blueprints</a> for large

projects.</p>

</li>

<li>

<p><a href="http://blog.miguelgrinberg.com/post/video-streaming-with-flask">Video streaming with Flask</a>

is another fantastic tutorial by Miguel Grinberg that covers video

streaming.</p>

</li>

<li>

<p><a href="https://medium.com/@5hreyans/the-one-weird-trick-that-cut-our-flask-page-load-time-by-70-87145335f679">One line of code cut our Flask page load times by 60%</a>

is an important note about optimizing Flask template cache size to

dramatically increase performance in some cases.</p>

</li>

<li>

<p><a href="https://www.twilio.com/blog/2014/03/unit-testing-your-twilio-app-using-pythons-flask-and-nose.html">Unit Testing Your Twilio App Using Python’s Flask and Nose</a>

covers integrating the Twilio API into a Flask application and how to test

that functionality with <a href="https://nose.readthedocs.org/en/latest/">nose</a>.</p>

</li>

<li>

<p>The Flask documentation has some quick examples for how to deploy Flask

with

<a href="http://flask.pocoo.org/docs/deploying/wsgi-standalone/">standalone WSGI containers</a>.</p>

</li>

<li>

<p><a href="https://realpython.com/blog/python/handling-email-confirmation-in-flask/">Handling Email Confirmation in Flask</a>

is a great walkthrough for a common use case of ensuring an email address

matches with the user's login information.</p>

</li>

<li>

<p>If you're not sure why <code>DEBUG</code> should be set to <code>False</code> in a production

<a href="/deployment.html">deployment</a>, be sure to read this article on

<a href="http://labs.detectify.com/post/130332638391/how-patreon-got-hacked-publicly-exposed-werkzeug">how Patreon got hacked</a>.</p>

</li>

</ul>

<h2>Open source Flask example projects</h2>

<ul>

<li>

<p><a href="https://github.com/makaimc/choose-your-own-adventure-presentations">Choose Your Own Adventure Presentations</a>

combines Flask with <a href="http://lab.hakim.se/reveal-js/">Reveal.js</a> and text

messages to create presentations where the audience can vote on how the

story should proceed. The code is all open source under an MIT license

and also uses the

<a href="https://flask-socketio.readthedocs.org/en/latest/">Flask-SocketIO</a> and

<a href="https://flask-wtf.readthedocs.org/en/latest/">Flask-WTF</a> projects to

support voting and form input.</p>

</li>

<li>

<p><a href="https://github.com/skylines-project/skylines">Skylines</a> is an open source

flight tracking web application built with Flask. You can check out a

<a href="https://skylines.aero/">running version of the application</a>.</p>

</li>

<li>

<p><a href="https://github.com/miguelgrinberg/microblog">Microblog</a> is the companion

open source project that goes along with Miguel Grinberg's O'Reilly Flask

book.</p>

</li>

<li>

<p><a href="https://github.com/mjhea0/flaskr-tdd">Flaskr TDD</a> takes the official Flask

tutorial and adds test driven development and JQuery to the project. </p>

</li>

<li>

<p>Here is a

<a href="http://charlesleifer.com/blog/saturday-morning-hack-a-little-note-taking-app-with-flask/">note-taking app</a>

along with the

<a href="https://gist.github.com/coleifer/632d3c9aa6b2ea519384">source code in Gists</a>.</p>

</li>

<li>

<p><a href="https://github.com/BouncyNudibranch/bean-counter">Bean Counter</a> is an

open source Flask app for tracking coffee.</p>

</li>

<li>

<p><a href="http://flaskbb.org/">FlaskBB</a> is a Flask app for a discussion forum.</p>

</li>

<li>

<p><a href="https://github.com/Jahaja/psdash">psdash</a> is an app built with Flask and

psutils to display information about the computer it is running on.</p>

</li>

</ul>

<h2>Flask project templates</h2>

<ul>

<li>

<p>Use the

<a href="https://github.com/kamalgill/flask-appengine-template">Flask App Engine Template</a>

for getting set up on Google App Engine with Flask.</p>

</li>

<li>

<p><a href="https://github.com/JackStouffer/Flask-Foundation">Flask Foundation</a> is a

starting point for new Flask projects. There's also a

<a href="https://jackstouffer.github.io/Flask-Foundation/">companion website</a> for

the project that explains what extensions the base project includes.</p>

</li>

<li>

<p><a href="https://github.com/sloria/cookiecutter-flask">Cookiecutter Flask</a> is a

project template for use with

<a href="https://github.com/audreyr/cookiecutter">Cookiecutter</a>.</p>

</li>

</ul>

<h2>Flask framework learning checklist</h2>

<ol>

<li>

<p><a href="http://flask.pocoo.org/docs/installation/">Install Flask</a> on

your local development machine.</p>

</li>

<li>

<p>Work through the 18-part Flask tutorial listed first under "Flask

resources" above.</p>

</li>

<li>

<p>Read through

<a href="http://flask.pocoo.org/extensions/">Flask Extensions Registry</a> to find

out what extensions you'll need to build your project.</p>

</li>

<li>

<p>Start coding your Flask app based on what you learned from the 18 part

Flask tutorial plus open source example applications found below. </p>

</li>

<li>

<p>Move on to the <a href="/deployment.html">deployment section</a> to get your initial

Flask project on the web.</p>

</li>

</ol>

<h3>What web development topic do you want to learn next?</h3>

<p class="under-btn">I've built a Python web app, now how do I deploy it?</p> </div>

</div>

<p class="under-btn">What other Python web frameworks exist?</p> </div>

</div>

<p class="under-btn">How can I version and store my source code?</p> </div>

</div>

</div><div id="mc_embed_signup">

<h4>Sign up here to receive an email with major updates to this site and Python tutorials delivered to your inbox once a month.</h4>

</div>

</div>

</form>

</div>

<h3 class="panel-head">Sponsored By</h3>

</div>

<p style="font-size: .8em;">If you're searching for step-by-step Flask

tutorials then I highly recommend

<a href="https://realpython.com/?utm_source=fsp&utm_medium=promo&utm_campaign=flask" onclick="trackOutboundLink('https://realpython.com/?utm_source=fsp&utm_medium=promo&utm_campaign=flask'); return false;">checking out Real Python</a>.

</p>

</div>

<h3 class="panel-head"><a href="/table-of-contents.html" style="color: #fff;">Table of Contents</a></h3>

</div>

<a href="/introduction.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Introduction</a>

<a href="/learning-programming.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Learning Programming</a>

<a href="/why-use-python.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Why Use Python?</a>

<a href="/python-2-or-3.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Python 2 or 3?</a>

<a href="/enterprise-python.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Enterprise Python</a>

<a href="/best-python-resources.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Best Python Resources</a>

<a href="/best-python-videos.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Best Python Videos</a>

<a href="/development-environments.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Development Environments</a>

<a href="/emacs.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Emacs</a>

<a href="/generators.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Generators</a>

<a href="/comprehensions.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Comprehensions</a>

<a href="/web-frameworks.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Web Frameworks</a>

<a href="/django.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Django</a>

<a href="/flask.html" class="list-group-item smaller-item active" style='font-family: "Helvetica Neue",sans-serif;'>Flask</a>

<a href="/bottle.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Bottle</a>

<a href="/pyramid.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Pyramid</a>

<a href="/morepath.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Morepath</a>

<a href="/other-web-frameworks.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Other Web Frameworks</a>

<a href="/web-design.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Web Design</a>

<a href="/cascading-style-sheets.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>Cascading Style Sheets</a>

<a href="/javascript.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>JavaScript</a>

<a href="/websockets.html" class="list-group-item smaller-item " style='font-family: "Helvetica Neue",sans-serif;'>WebSockets</a>

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<p style="font-size: .8em; margin-top: 10px;">Searching for a complete, step-by-step deployment walkthrough? Learn more about <a href="http://www.deploypython.com/">The Full Stack Python Guide to Deployments book</a>.

</p>

</div>

</div> <div class="panel panel-success">

<div class="panel-heading"><h3 class="panel-head">Flask</h3></div>

Major updates are tweeted via

<a href="https://twitter.com/fullstackpython">@fullstackpython</a>.

<hr/>

Need more detailed tutorials than you see here?

<a href="http://www.deploypython.com/">Learn more about The Full Stack Python Guide to Deployments book.</a>

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<a href="http://www.mattmakai.com/" class="underline">Matt Makai</a>

2015

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