12.3.1 Views
A view is any Python callable that takes an HttpRequest instance and returns an HttpResponse object.
Typically, views are either (1) a function or (2) an object instantiated by a subclass of View. Developers could build their own class for providing the basic behavior of a view, but doing so turns out to be tricky. To best avoid security problems, developers typically stick to using View when building class-based views (CBVs) because it is safer and quicker.
The advantage of using a function for a view is the simplicity of a function. The advantage of using a CBV is better adherence to HTTP. Similar behavior is available to developers when programming function views thanks to the require_http_methods decorator (and its siblings, ...
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