Software engineering facts, information, and skills categorized as Python
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
An object representing a stream of data. Repeated calls to the iterator’s
__next__() method (or passing it to the built-in function
next()) 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.
__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.
How to deal with "SubfieldBase has been deprecated. Use Field.from_db_value instead." On upgrade to Django 1.9, we may now get the warning
Python 3 - Django 2.x: ImportError: No module named 'django.core.urlresolvers' is a common error we get when we migrate from python 2.x to python 3.x and use latest Django > 2.0. the common error message looks like
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