Flask Web Development: Developing Web Applications with by Miguel Grinberg

By Miguel Grinberg

Take complete inventive keep watch over of your net purposes with Flask, the Python-based microframework. With this hands-on booklet, you'll study Flask from the floor up by means of constructing an entire social running a blog program step by step. writer Miguel Grinberg walks you thru the framework's middle performance, and exhibits you the way to increase functions with complicated net strategies comparable to database migration and net provider communication.

Rather than impose improvement instructions as different frameworks do, Flask leaves the company of extensions as much as you. when you've got Python event, this e-book indicates you the way to use that inventive freedom.
* research Flask's simple software constitution and write an instance app
* paintings with must-have components—templates, databases, net kinds, and electronic mail support
* Use programs and modules to constitution a wide software that scales
* enforce person authentication, roles, and profiles
* construct a running a blog characteristic by means of reusing templates, paginating merchandise lists, and dealing with wealthy text
* Use a Flask-based RESTful API to show app performance to smartphones, pills, and different third-party clients
* how one can run unit assessments and increase software performance
* discover concepts for deploying your internet app to a creation server

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Example 4-4 shows the updated index() view function. Example 4-4. route decorator tells Flask to register the view function as a handler for GET and POST requests in the URL map. When methods is not given, the view function is registered to handle GET requests only. Adding POST to the method list is necessary because form submissions are much more conveniently handled as POST requests. It is possible to submit a form as a GET request, but as GET requests have no body, the data is appended to the URL as a query string and becomes visible in the browser’s address bar.

To avoid these problems, Flask provides the url_for() helper function, which generates URLs from the information stored in the application’s URL map. add_url_route()) as its single argument and returns its URL. py the call url_for('index') would re‐ turn /. Calling url_for('index', _external=True) would instead return an absolute URL, which in this example is http://localhost:5000/. Relative URLs are sufficient when generating links that connect the different routes of the application. Absolute URLs are necessary on‐ ly for links that will be used outside of the web browser, such as when sending links by email.

The optional validators argument included in the StringField constructor defines a list of checkers that will be applied to the data submitted by the user before it is ac‐ cepted. The Required() validator ensures that the field is not submitted empty. wtf. The fields and validators, however, are imported directly from the WTForms package. The list of standard HTML fields supported by WTForms is shown in Table 4-1. Table 4-1. Decimal value FloatField Text field that accepts a floating-point value BooleanField Checkbox with True and False values RadioField List of radio buttons SelectField Drop-down list of choices SelectMultipleField Drop-down list of choices with multiple selection FileField File upload field SubmitField Form submission button FormField Embed a form as a field in a container form FieldList List of fields of a given type The list of WTForms built-in validators is shown in Table 4-2.

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