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<h1>Web Frameworks</h1>

<p>A web application framework is a collection of libraries that

provide functionality to accomplish common operations for the web. These

common operations include:</p>

<ol class="arabic simple">

<li>URL routing</li>

<li>HTML, XML, JSON, and other output format templating</li>

<li>Database manipulation</li>

<li>Security against Cross-site request forgery (CSRF) and other attacks</li>

<p>Not all web frameworks include functionality for all of the above

functionality. Frameworks fall somewhere between simply executing a

single use case and attempting to be everything to every developer with

increased complexity.</p>

<p>For example, the Django web application framework includes an

Object-Relational Mapping (ORM) layer that abstracts relational database

read, write, query, and delete operations. However, Django's ORM

cannot work without significant modification on non-relational databases such

<a class="reference external" href="http://www.mongodb.org/">MongoDB</a> and <a class="reference external" href="http://docs.basho.com/">Riak</a>.

Other web frameworks such as Flask and Pyramid are generally easier to

use with non-relational databases by incorporating external Python libraries.

There is a spectrum between minimal functionality with easy extensibility and

including everything in the framework with tight integration.</p>

<div class="section" id="django">

<h2>Django</h2>

<p><a class="reference external" href="http://www.djangoproject.com/">Django</a> is a widely used Python web

application framework with a &quot;batteries-included&quot; philosophy. The principle

behind batteries-included is that the common functionality for building

web applications should come with the framework instead of as a separate

library. For example,

<a class="reference external" href="https://docs.djangoproject.com/en/dev/topics/http/urls/">URL routing</a>, a

<a class="reference external" href="https://docs.djangoproject.com/en/dev/topics/templates/">templating system</a>,

<a class="reference external" href="https://docs.djangoproject.com/en/dev/topics/db/">object-relational mapper</a>,

and a <a class="reference external" href="https://docs.djangoproject.com/en/dev/topics/migrations/">database schema migrations</a>

(as of version 1.7) are all included with the <a class="reference external" href="https://pypi.python.org/pypi/Django/1.6.2">Django library</a>.</p>

<div class="section" id="django-resources">

<h3>Django resources</h3>

<p><a class="reference external" href="http://twoscoopspress.com/products/two-scoops-of-django-1-6">2 Scoops of Django</a>

by Daniel Greenfield and Audrey Roy is well worth the price of admission if

you're serious about learning how to correctly develop Django websites.</p>

<p><a class="reference external" href="http://effectivedjango.com/">Effective Django</a> and

<a class="reference external" href="http://www.tangowithdjango.com/book/">Tango with Django</a> are a great free

introductions to using the most popular Python web framework.</p>

<p>DjangoCon US videos from

<a class="reference external" href="http://www.youtube.com/user/TheOpenBastion/videos">2013</a>,

<a class="reference external" href="http://pyvideo.org/category/23/djangocon-2012">2012</a>,

<a class="reference external" href="http://pyvideo.org/category/3/djangocon-2011">2011</a>, as well as

<a class="reference external" href="http://pyvideo.org/category">earlier US and DjangoCon EU conferences</a> are

all available free of charge.</p>

<p>The <a class="reference external" href="http://www.reddit.com/r/django">Django subreddit</a> often has links to

the latest resources for learning Django.</p>

<p>Lincoln Loop wrote a

<a class="reference external" href="http://lincolnloop.com/django-best-practices/">Django Best Practices guide</a>

for the community.</p>

<p>Steve Losh wrote an incredibly detailed <a class="reference external" href="http://stevelosh.com/blog/2011/06/django-advice/">Django Advice guide</a>.</p>

<div class="section" id="flask">

<h2>Flask</h2>

<p><a class="reference external" href="http://flask.pocoo.org/">Flask</a> is a Python microframework deliberately

built with a

<a class="reference external" href="http://flask.pocoo.org/docs/design/">small core and easy extensibility philosophy</a>.

Flask is generally considered more

&quot;<a class="reference external" href="http://stackoverflow.com/questions/58968/what-defines-pythonian-or-pythonic">Pythonic</a>&quot; than Django because Flask web application code is often more

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

<div class="section" id="flask-resources">

<h3>Flask resources</h3>

<p>The 18 post series Flask mega tutorial is an absolutely amazing starting

resource:</p>

<ul class="simple">

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world">Part 1: Hello World</a></li>

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-ii-templates">Part 2: Templates</a></li>

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-iii-web-forms">Part 3: Web Forms</a></li>

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-iv-database">Part 4: Database</a></li>

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-v-user-logins">Part 5: User Logins</a></li>

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

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-vii-unit-testing">Part 7: Unit Testing</a></li>

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

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-ix-pagination">Part 9: Pagination</a></li>

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

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xi-email-support">Part 11: Email Support</a></li>

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xii-facelift">Part 12: Facelift</a></li>

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xiii-dates-and-times">Part 13: Dates and Times</a></li>

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xiv-i18n-and-l10n">Part 14: I18n and L10n</a></li>

<li><a class="reference external" href="http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xv-ajax">Part 15: Ajax</a></li>

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

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

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

<p>Yes, there are many parts to the series. However, each post is focused on

a single topic to contain the complexity. The whole series is well

worth an in-depth read-through. The

<a class="reference external" href="https://twitter.com/miguelgrinberg">author</a> is also writing the

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

book so consider picking that up as well.</p>

<p>The <a class="reference external" href="http://flask.pocoo.org/extensions/">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>

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

<p>The Plank &amp; Whittle blog has two posts, one on <a class="reference external" href="http://www.plankandwhittle.com/packaging-a-flask-web-app/">Packaging a Flask web app</a>

and another on <a class="reference external" 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>

<p>The tuts+ <a class="reference external" 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>

<div class="section" id="web-framework-logging">

<h2>Web Framework Logging</h2>

<p>Logging is a common mechanism for monitoring web applications written with a

web framework. Runtime exceptions that prevent code from running are

important to log to investigate and fix the source of the problems.

Informational and debugging logging also helps to understand how the

application is performing even if code is working as intended.</p>

<p>Logging is often grouped into several categories:</p>

<ol class="arabic simple">

<li>Information</li>

<li>Debug</li>

<li>Warning</li>

<li>Error</li>

<p>Logging errors that occur while a web framework is running is crucial to

understanding how your application is performing.

<a class="reference external" href="http://raven.readthedocs.org/en/latest/">Raven</a> is a Python client for the

<a class="reference external" href="https://github.com/getsentry/sentry">Sentry</a> exception logging and

aggregation application. Raven provides the way to send exceptions to

Sentry, which should be deployed on a separate server from your production

infrastructure. Raven can also be used by Python scripts to send other

log data to Sentry for aggregation. Sentry provides a clean web application

interface for viewing the exceptions. Sentry can also be configured with a

mail plugin to send emails when exceptions occur.</p>

<div class="section" id="web-framework-resources">

<h3>Web Framework Resources</h3>

<p><a class="reference external" href="http://bottlepy.org/docs/dev/">Bottle</a>,

<a class="reference external" href="http://www.pylonsproject.org/">Pyramid</a>,

<a class="reference external" href="http://falconframework.org/">Falcon</a>,

<a class="reference external" href="http://webpy.org/">web.py</a> are the most common Python web frameworks other

than Django and Flask.</p>

<p>This <a class="reference external" href="http://codecondo.com/14-minimal-web-frameworks-for-python/">roundup of 14 minimal Python frameworks</a>

contains both familiar and less known Python libraries.</p>

<br/>

Next read the

<a href="/task-queues.html">task queues</a> section.

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<a href="/introduction.html" class="list-group-item ">Introduction</a>

<a href="/servers.html" class="list-group-item ">Servers</a>

<a href="/operating-systems.html" class="list-group-item ">Operating Systems</a>

<a href="/web-servers.html" class="list-group-item ">Web Servers</a>

<a href="/platform-as-a-service.html" class="list-group-item ">Platform-as-a-service</a>

<a href="/databases.html" class="list-group-item ">Databases</a>

<a href="/wsgi-servers.html" class="list-group-item ">WSGI Servers</a>

<a href="/web-frameworks.html" class="list-group-item active">Web Frameworks</a>

<a href="/task-queues.html" class="list-group-item ">Task Queues</a>

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<a href="/configuration-management.html" class="list-group-item ">Configuration Management</a>

<a href="/dependency-management.html" class="list-group-item ">Application Dependencies</a>

<a href="/no-sql-datastore.html" class="list-group-item ">NoSQL Data Stores</a>

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