Building Web Applications with Flask by Italo Maia

By Italo Maia

Use Python and Flask to construct striking net purposes, simply how you wish them!

About This Book

  • Learn tips on how to use kinds, authentication, and authorization regulate via extensions, and supply a powerful, secure net adventure for the client
  • Free your self from the SQL vs NoSQL paradigm and use the know-how that most closely fits your needs
  • Add robust ideas like TDD and BDD in your diversity of trying out skills

Who This ebook Is For

If you're a Python internet developer who desires to examine extra approximately constructing purposes in Flask and scaling them with industry-standard practices, this is often the e-book for you.

What you'll Learn

  • Create unmarried web page purposes with Flask
  • Use macros, filters, tags, and regulate constructions to render wealthy responses to person requests
  • Receive varieties securely via form-based periods and WTForms
  • Utilize NoSQL or SQL databases to shop person info seamlessly
  • Generate uncomplicated, but robust, relaxation companies out of your facts models
  • Learn the way to practice test-driven and behavior-driven advancements on your Flask projects
  • Use Flask parts to create maintainable non-flat projects
  • Harvest the ability of extensions to construct strong authorization and permission policies

In Detail

Flask is a strong internet framework that is helping you construct nice tasks utilizing your favourite instruments. Flask takes the versatile Python programming language and gives an easy template for net improvement. as soon as imported into Python, Flask can be utilized to save lots of time development internet functions. It is going opposed to the movement with the microframework notion, leaving lots of the structure offerings to the developer. via its nice API, extensions, and robust styles, Flask is helping you create easy tasks in mins and intricate ones once possible.

From the start, construction internet functions with Flask indicates you the way to make use of Flask's recommendations, extensions, and elements to create enticing, full-featured internet initiatives. you are going to how one can correctly deal with types utilizing WTForms, devise handy templates with Jinja2 tags and macros, use NoSQL and SQL databases to shop person facts, attempt your initiatives with good points and unit assessments, create robust authentication and consumer authorization, in addition to administrative interfaces conveniently, and more.

As Flask doesn't implement an architectural recipe, neither can we! This e-book makes no coding assumptions on the way you may still code, leaving you unfastened to experiment.

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Additional info for Building Web Applications with Flask

Example text

Revindex0 }} {% endfor %} The for loop statement, as in Python, also allow the use of else, but with a slightly different meaning. In Python, when you use else with for, the else block is only executed if it was not reached through a break command like this: for i in [1, 2, 3]: pass else: print "this will be printed" for i in [1, 2, 3]: if i == 3: break else: print "this will never not be printed" As seen in the preceding code snippet, the else block will only be executed in a for loop if the execution was never broken by a break command.

Finally, our form is written and explained. asp. run() [ 29 ] Please Fill in This Form, Madam In the preceding example, we define a view called login_view that accepts get or post requests; when the request is post (we ignore the form if it was sent by a get request), we fetch the values for username and passwd; then we run a very simple validation and change the value of msg accordingly. Beware: a view, in Flask, is not the same as a view in MVC. In Flask, a view is the component that receives a request and returns a response, which may be a function or a class.

It works with SQLite, Postgres, MySQL, Oracle, and all SQL databases, which comes with compatible drivers. html). One of its main goals is to be a great embeddable database solution for applications and small devices, which it is! It is also very easy to use and that makes it perfect for our learning purposes. Though all the examples will be given and tested with SQLite in mind, they should work in the other databases with little to no changes. Database-specific tips will be given from time to time whenever appropriate.

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