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adding example code to django page
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‎content/pages/03-data/06-sqlalchemy.markdown‎

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based on various developers' experiences.
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### Open source code for using SQLAlchemy
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## Open source code for learning SQLAlchemy
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Many open source projects rely on SQLAlchemy. A great way to learn
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how to properly work with this tool is to read the code that shows
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how those projects use SQLAlchemy. This section alphabetically lists

‎content/pages/04-web-development/02-django.markdown‎

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[template engine](/django-templates.html),
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an [object-relational mapper](/object-relational-mappers-orms.html) (ORM),
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and [database schema migrations](https://docs.djangoproject.com/en/dev/topics/migrations/)
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(as of version 1.7) are all included with the [Django framework](https://pypi.org/project/Django/).
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are all included with the [Django framework](https://pypi.org/project/Django/).
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Compare that included functionality to the Flask framework which requires a
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separate library such as
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[Flask-Login](https://flask-login.readthedocs.org/en/latest/)
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shows how to configure Django to load and serve up static and media files, public and private, via an Amazon S3 bucket.
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## Open source Django example projects
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* [Browser calls with Django and Twilio](https://www.twilio.com/docs/howto/walkthrough/browser-calls/python/django)
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shows how to build a web app with Django and
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[Twilio Client](https://www.twilio.com/client) to turn a user's web
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browser into a full-fledged phone. Pretty awesome!
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* [Txt 2 React](https://github.com/mattmakai/txt2react) is a full Django web
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app that allows audiences to text in during a presentation with feedback
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or questions.
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* [Openduty](https://github.com/ustream/openduty) is a website status checking
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and alert system similar to PagerDuty.
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* [Courtside](https://github.com/myusuf3/courtside) is a pick up sports web
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application written and maintained by the author of PyCoder's Weekly.
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* These two Django Interactive Voice Response (IVR) system web application
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repositories [part 1](https://github.com/phalt/twilio-django-part-1) and
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[part 2](https://github.com/phalt/twilio-django-part-2) show you how to
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build a really cool Django application. There's also an accompanying
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[blog post](https://www.twilio.com/blog/2014/07/build-an-ivr-system-with-twilio-and-django.html)
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with detailed explanations of each step.
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* [Taiga](https://github.com/taigaio/taiga-back) is a project management
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tool built with Django as the backend and AngularJS as the front end.
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## Django project templates
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Project templates, not to be confused with a
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[template engine](/template-engines.html), generate boilerplate code for
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a base Django project plus optional libraries that are often used when
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developing web applications.
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* [Caktus Group's Django project template](https://github.com/caktus/django-project-template)
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is Django 1.6+ ready.
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is Django 2.2+ ready.
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* [Cookiecutter Django](https://github.com/pydanny/cookiecutter-django) is a
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project template from Daniel Greenfeld, for use with Audrey Roy's
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template from Mozilla that is compatible with cookiecutter.
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## Django learning checklist
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1. [Install Django](https://docs.djangoproject.com/en/dev/topics/install/) on
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your local development machine.
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## Open source Django example projects
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Reading open source code can be useful when you are trying to figure
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out how to build your own projects. This is a short list of some
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real-world example applications, and many more can be found on the
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[Django example projects and code](/django-code-examples.html) page.
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1. Work through the initial
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["polls" tutorial](https://docs.djangoproject.com/en/dev/intro/tutorial01/).
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1. Build a few more simple applications using the tutorial resources found
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in the "Django resources" section.
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* [Browser calls with Django and Twilio](https://www.twilio.com/docs/howto/walkthrough/browser-calls/python/django)
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shows how to build a web app with Django and
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[Twilio Client](https://www.twilio.com/client) to turn a user's web
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browser into a full-fledged phone. Pretty awesome!
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1. Start coding your own Django project with help from the
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[official documentation](https://docs.djangoproject.com/en/dev/) and
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resource links below. You'll make plenty of mistakes which is critical
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on your path to learning the right way to build applications.
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* [Openduty](https://github.com/ustream/openduty) is a website status checking
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and alert system similar to PagerDuty.
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1. Read [2 Scoops of Django](http://www.amazon.com/Two-Scoops-Django-Best-Practices/dp/0981467342)
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to understand Django good practices and learn better ways of building
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Django web applications.
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* [Courtside](https://github.com/myusuf3/courtside) is a pick up sports web
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application written and maintained by the author of PyCoder's Weekly.
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* These two Django Interactive Voice Response (IVR) system web application
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repositories [part 1](https://github.com/phalt/twilio-django-part-1) and
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[part 2](https://github.com/phalt/twilio-django-part-2) show you how to
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build a really cool Django application. There's also an accompanying
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[blog post](https://www.twilio.com/blog/2014/07/build-an-ivr-system-with-twilio-and-django.html)
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with detailed explanations of each step.
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* [Taiga](https://github.com/taigaio/taiga-back) is a project management
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tool built with Django as the backend and AngularJS as the front end.
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1. Move on to the [deployment section](/deployment.html) to get your Django
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project on the web.
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## Open source code to learn Django
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There are many open source projects that rely on Django.
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One of the best ways to learn how to use this framework is to read
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how other projects use it in real-world code. This section lists
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these code examples by class and method in Django's code base.

‎content/pages/04-web-development/03-flask.markdown‎

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in the JavaScript world.
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### Open source code for using Flask
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## Open source code for learning Flask
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There are many open source projects that rely on Flask to operate.
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One of the best ways to learn how to use this framework is to read
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how other projects use it in real-world code. This section lists

‎content/pages/examples/django/django-core-exceptions-disallowedredirect.markdown‎

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title: django.core.exceptions DisallowedRedirect Example Code
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category: page
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slug: django-core-exceptions-disallowedredirect-examples
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sortorder: 500011098
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toc: False
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sidebartitle: django.core.exceptions DisallowedRedirect
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meta: Python example code for the DisallowedRedirect class from the django.core.exceptions module of the Django project.
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DisallowedRedirect is a class within the django.core.exceptions module of the Django project.
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## Example 1 from django-oauth-toolkit
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[django-oauth-toolkit](https://github.com/jazzband/django-oauth-toolkit)
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([project website](http://dot.evonove.it/) and
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[PyPI package information](https://pypi.org/project/django-oauth-toolkit/1.2.0/))
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is a code library for adding and handling [OAuth2](https://oauth.net/)
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flows within your [Django](/django.html) web application and
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[API](/application-programming-interfaces.html).
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The django-oauth-toolkit project is open sourced under the
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[FreeBSD license](https://github.com/jazzband/django-oauth-toolkit/blob/master/LICENSE)
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and it is maintained by the developer community group
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[Jazzband](https://jazzband.co/).
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[**django-oauth-toolkit / oauth2_provider / http.py**](https://github.com/jazzband/django-oauth-toolkit/blob/master/oauth2_provider/./http.py)
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```python
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# http.py
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from urllib.parse import urlparse
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~~from django.core.exceptions import DisallowedRedirect
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from django.http import HttpResponse
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from django.utils.encoding import iri_to_uri
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class OAuth2ResponseRedirect(HttpResponse):
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status_code = 302
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def __init__(self, redirect_to, allowed_schemes, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self["Location"] = iri_to_uri(redirect_to)
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self.allowed_schemes = allowed_schemes
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self.validate_redirect(redirect_to)
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@property
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def url(self):
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return self["Location"]
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def validate_redirect(self, redirect_to):
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parsed = urlparse(str(redirect_to))
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if not parsed.scheme:
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~~ raise DisallowedRedirect("OAuth2 redirects require a URI scheme.")
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if parsed.scheme not in self.allowed_schemes:
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~~ raise DisallowedRedirect(
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"Redirect to scheme {!r} is not permitted".format(parsed.scheme)
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)
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## ... source file continues with no further DisallowedRedirect examples...
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```
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