By Joel Perras
Flask is a small yet strong net improvement framework for Python. even though Flask is called a micro-framework, it's no means missing in performance; there are lots of extensions on hand to Flask which is helping it to operate on the related point as different huge frameworks corresponding to Django and Ruby on Rails.
This booklet will display tips on how to enhance a chain of internet program tasks with the Python net micro-framework, and leverage extensions and exterior Python libraries and APIs to increase the improvement of various higher and extra advanced net applications.
The ebook will begin by way of explaining Python’s Virtualenv library and the way to create and turn among a number of digital environments. You’ll first construct an SQL database-backed software, on the way to use Flask-WTF, Flask-SQLAlchemy, Jinja templates, and different tools. subsequent you’ll stream directly to a timeline software, outfitted utilizing innovations together with pytest-Flask, the Blinker package deal, facts modelling for consumer timelines, exception dealing with, and developing and organizing CLI instruments.
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Sample text
If, for some reason, it is preferable to write raw SQL query strings or to use the SQLAlchemy expression language directly, then you can do that and still benefit from the connection pooling and the Python DBAPI abstraction functionality that is the core of SQLAlchemy itself. Now that we've given you several reasons why you should be using this database query and domain data abstraction layer, let's look at how we would go about defining a basic data model. Declarative mapping and Flask-SQLAlchemy SQLAlchemy implements a design pattern known as a data mapper.
The minor additional complexity of separating it out into a different module will save you from headaches later on. In this new module, we imported the Blueprint class from Flask and used it to instantiate a users blueprint object. The Blueprint class has two required arguments, name and import_name, which we provide as users and the __name__ global magic attribute available to all Python modules and scripts. The former may be any unique identifier among all the registered blueprints that we desire and the latter should be the name of the module where the blueprint object is instantiated.
Id) [ 42 ] Chapter 3 Most of this model should be relatively familiar; it is not that much different from the one we constructed previously for our User schema. For our snaps, we will require a few mandatory attributes, as follows: • user_id: This is the ID of the user who has created the snap. As our current implementation will require a user to be authenticated in order to create a snap, all the resulting snaps will be tied to the user who posted them. This will also make it trivial to extend the system at a later time so as to include the user profiles, personal snap statistics, and ability to delete a snap.