A Q objects (django.db.models.Q) is an object used to encapsulate a collection of keyword arguments.
Software engineering facts, information, and skills categorized as Django
A Q objects (django.db.models.Q) is an object used to encapsulate a collection of keyword arguments.
Generators are used to create iterators, but with a different approach. Generators are simple functions which return an iterable set of items, one at a time, in a special way.
Signal(providing_args=list)All signals are django.dispatch.Signal instances. The providing_args is a list of the names of arguments the signal will provide to listeners.
Django uses request and response objects to pass state through the system. When a page is requested, Django creates an HttpRequest object that contains metadata about the request. Then Django loads the appropriate view, passing the HttpRequest as the first argument to the view function. Each view is responsible for returning an HttpResponse object.
An object representing a stream of data. Repeated calls to the iterator’s __next__() method (or passing it to the built-in functionnext()) return successive items in the stream. When no more data are available a StopIteration exception is raised instead. At this point, the iterator object is exhausted and any further calls to its __next__() method just raise StopIteration again. Iterators are required to have an __iter__() method that returns the iterator object itself so every iterator is also iterable and may be used in most places where other iterables are accepted. One notable exception is code which attempts multiple iteration passes. A container object (such as a list) produces a fresh new iterator each time you pass it to the iter() function or use it in a for loop. Attempting this with an iterator will just return the same exhausted iterator object used in the previous iteration pass, making it appear like an empty container.
Both __repr__ and __str__ are used to represent objects in different ways.The default implementation of __repr__ for a str value can be called as an argument to eval, and the return value would be a valid string object.
The main differnce for null and blank is
What is @permalink and get_absolute_url in Django? When and why to use it?
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