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python Programming Glossary: subclassWhat is different between all these OpenCV Python interfaces? http://stackoverflow.com/questions/10417108/what-is-different-between-all-these-opencv-python-interfaces latest releases there is only the cv2 module and cv is a subclass inside cv2 . You need to call import cv2.cv as cv to access..
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)? http://stackoverflow.com/questions/11011756/is-there-any-pythonic-way-to-combine-two-dicts-adding-values-for-keys-that-appe B Counter 'c' 7 'b' 5 'd' 5 'a' 1 Counters are basically a subclass of dict so you can still do everything else with them you'd..
Using property() on classmethods http://stackoverflow.com/questions/128573/using-property-on-classmethods for properties when used as a class attribute you can subclass property it is a new style type itself to extend its __get__.. the prescribed solution is to create a ClassProperty as a subclass of property. class ClassProperty property def __get__ self cls..
Django: add image in an ImageField from image url http://stackoverflow.com/questions/1393202/django-add-image-in-an-imagefield-from-image-url needed. You can create callback function custom URLOpener subclass but I found it easier just to create my own temp file like this..
Differences between isinstance() and type() in python http://stackoverflow.com/questions/1549801/differences-between-isinstance-and-type-in-python identity of types and rejects instances of subtypes AKA subclasses . Normally in Python you want your code to support inheritance.. exists only to let you use isinstance both str and Unicode subclass basestring . Strings are sequences you could loop over them.. Base Class ABC it offers no concrete functionality to subclasses but rather exists as a marker mainly for use with isinstance..
Is False == 0 and True == 1 in Python an implementation detail or is it guaranteed by the language? http://stackoverflow.com/questions/2764017/is-false-0-and-true-1-in-python-an-implementation-detail-or-is-it-guarante always in Python 3 False object is of type bool which is a subclass of int object int bool It is the only reason why in your example.. does work. It would not work with an object which is not a subclass of integer because list indexing only works with integers or..
Is it Pythonic to use bools as ints? http://stackoverflow.com/questions/3174392/is-it-pythonic-to-use-bools-as-ints all lowercase some cap initial and so introduced the bool subclass of int and its True and False constants. There was quite some..
Using Django time/date widgets in custom form http://stackoverflow.com/questions/38601/using-django-time-date-widgets-in-custom-form you have to do to make this work Define your own ModelForm subclass for your model best to put it in forms.py in your app and tell..
Accessing dict keys like an attribute in Python? http://stackoverflow.com/questions/4984647/accessing-dict-keys-like-an-attribute-in-python would need to be just a plain dict so we can assign any subclass of dict to the internal dictionary. In our case we simply assign..
What is a mixin, and why are they useful? http://stackoverflow.com/questions/533631/what-is-a-mixin-and-why-are-they-useful inheritance to extend a class as opposed to 'proper' subclassing. Is this right Why would I want to do that rather than put.. to do that rather than put the new functionality into a subclass For that matter why would a mixin multiple inheritance approach..
Old style and new style classes in Python http://stackoverflow.com/questions/54867/old-style-and-new-style-classes-in-python has a number of immediate benefits like the ability to subclass most built in types or the introduction of descriptors which.. Python 3 only has new style classes . No matter if you subclass from object or not classes are new style in Python 3. It is..
Django Passing Custom Form Parameters to Formset http://stackoverflow.com/questions/622982/django-passing-custom-form-parameters-to-formset ServiceForm in any way i.e. by making it difficult to subclass . You'll get some strange naming i.e. the formset will be called..
Creating a singleton in python http://stackoverflow.com/questions/6760685/creating-a-singleton-in-python recurse. This means you can't customize __new__ and can't subclass a class that needs you to call up to __init__ . python singleton.. in ORMs. In this situation if you use your Method #2 and a subclass defines a __new__ method it will be executed every time you.. because the metaclass is not a base class but for subclasses of the created class that use multiple inheritance you need..
subclass __init__ overrides superclass's [duplicate] http://stackoverflow.com/questions/13545985/subclass-init-overrides-superclasss like single inheritance both methods are equivalent. class Subclass Superclass def __init__ self Superclass.__init__ self class.. def __init__ self Superclass.__init__ self class Subclass Superclass def __init__ self super Subclass self .__init__ ..
When calling super() in a derived class, can I pass in self.__class__? http://stackoverflow.com/questions/18208683/when-calling-super-in-a-derived-class-can-i-pass-in-self-class self print 'derived' super type self self .method class Subclass Derived def method self print 'subclass of derived' super Subclass.. Derived def method self print 'subclass of derived' super Subclass self .method Demo Subclass .method subclass of derived derived.. 'subclass of derived' super Subclass self .method Demo Subclass .method subclass of derived derived derived derived ... many..
Checking for membership inside nested dict http://stackoverflow.com/questions/2901872/checking-for-membership-inside-nested-dict format it becomes trivial to add the new format. Subclass your virtual loader class to handle the XML parsing generation...
Practical example of Polymorphism http://stackoverflow.com/questions/3724110/practical-example-of-polymorphism defined by convention only raise NotImplementedError Subclass must implement abstract method class Cat Animal def talk self..
Why aren't Python's superclass __init__ methods automatically invoked? http://stackoverflow.com/questions/3782827/why-arent-pythons-superclass-init-methods-automatically-invoked object def __init__ self print 'Do something' class Subclass Superclass def __init__ self super Subclass self .__init__ print.. class Subclass Superclass def __init__ self super Subclass self .__init__ print 'Do something else' python inheritance..
Django: How to build a custom form widget? http://stackoverflow.com/questions/4707192/django-how-to-build-a-custom-form-widget in common with the default widgets with Select if any . Subclass from Widget and if you find any common pattern with builtins..
http://stackoverflow.com/questions/636905/django-form-set-label RegistrationFormTermsOfService Subclass of ``RegistrationForm`` which adds a required checkbox for agreeing..
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