By Marty Alchin
Django is the major Python internet software improvement framework. leverage the Django net framework to its complete capability during this complicated educational and reference. recommended through Django, Pro Django kind of choices up the place The Definitive consultant to Django left off and examines in better element the weird and complicated difficulties that Python internet software builders can face and the way to unravel them.
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<h3>What you’ll learn</h3> * See the best way to use Django’s types, perspectives, kinds, and templates.
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This publication is for corporations trying to find a framework able to assisting company wishes, in addition to complex Python or net builders seeking to remedy strange, complicated problems.
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Django is the prime Python internet software improvement framework. the best way to leverage the Django internet framework to its complete power during this complex instructional and reference. recommended through Django, seasoned Django kind of choices up the place The Definitive advisor to Django left off and examines in larger element the weird and complicated difficulties that Python net software builders can face and the way to unravel them.
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Additional info for Pro Django
H]oo#:(% =ppne^qpao6 [[ik`qha[[6#[[i]ej[[# Notice how the subclass here doesn’t have to worry about the fact that there’s a metaclass in use behind the scenes. By just specifying a base class, it inherits all the benefits. Django uses this behavior to implement one of its most prominent features, described in the next section. CHAPTER 2 D JA N G O I S P Y T H O N Declarative Syntax Some of Django’s more prominent tools feature a “declarative syntax” that is simple to read, write and understand.
A simple solution to this is to have the attributes themselves keep track of the instantiation sequence; the metaclass can then order them accordingly. This process works by having all attribute classes inherit from a particular base class, which can count how many times the class is instantiated and assign a number to each instance. _h]oo>]oa=ppne^qpa$k^fa_p%6 _na]pekj[_kqjpan9`ab[[ejep[[$oahb%6 oahb*_na]pekj[_kqjpan9>]oa=ppne^qpa*_na]pekj[_kqjpan >]oa=ppne^qpa*_na]pekj[_kqjpan'9Object instances have a different namespace than classes, so all instances of this class will have a _na]pekj[_kqjpan, which can be used to sort the objects according to the order in which they were instantiated.
The descriptor class can include any other attributes or methods as necessary to perform the tasks it’s responsible for, while the following methods constitute a kind of protocol that enables this special behavior. __get__(self, instance, owner) When retrieving the value of an attribute (r]hqa9k^f*]ppn), this method will be called instead, allowing the descriptor to do some extra work before returning the value. In addition to the usual oahb representing the descriptor object, this getter method receives two arguments.