Supported using the update_abstractmethods() function. To declare abstract methods for properties and descriptors.ĭynamically adding abstract methods to a class, or attempting to modify theĪbstraction status of a method or class once it is created, are only The abstract methods can be called using any
A class that has a metaclass derived fromĪBCMeta cannot be instantiated unless all of its abstract methodsĪnd properties are overridden. Using this decorator requires that the class’s metaclass is ABCMeta The abc module also provides the following decorator: abc. Note that this will not make get_iteratorĪvailable as a method of Foo, so it is provided separately. The old-style iterable protocol, defined in terms of _len_() and Via the _mro_ list) is considered a MyIterable too.įinally, the last line makes Foo a virtual subclass of MyIterable,Įven though it does not define an _iter_() method (it uses _dict_ (or in that of one of its base classes, accessed The _subclasshook_() class method defined here says that any class To be overridden in non-abstract derived classes. Is also part of the MyIterable abstract base class, but it does not have 1.7 A Simple Java Program 1.8 Creating, Compiling, and Executing a Java Program Windows Mac. Here can still be called from subclasses. 1.3 Programming Languages 1.4 Operating Systems 1.5 Java.
The ABC MyIterable defines the standard iterable method, _mro_ ): return True return NotImplemented MyIterable. _iter_ () def _subclasshook_ ( cls, C ): if cls is MyIterable : if any ( "_iter_" in B. def get_iterator ( self ): return iter ( self ) class MyIterable ( ABC ): def _iter_ ( self ): while False : yield None def get_iterator ( self ): return self.
Class Foo : def _getitem_ ( self, index ).
0 kommentar(er)
