![]() Since some set operations create new sets, the default mixin methods needĪ way to create new instances from an iterable. Notes on using Set and MutableSet as a mixin: elements ) s1 = ListBasedSet ( 'abcdef' ) s2 = ListBasedSet ( 'defghi' ) overlap = s1 & s2 # The _and_() method is supported automatically elements def _len_ ( self ): return len ( self. elements ) def _contains_ ( self, value ): return value in self. append ( value ) def _iter_ ( self ): return iter ( self. elements = lst = for value in iterable : if value not in lst : lst. ''' def _init_ ( self, iterable ): self. ![]() Set ): ''' Alternate set implementation favoring space over speed and not requiring the set elements to be hashable. Collection ¶ĪBC for sized iterable container classes.Ĭlass ListBasedSet ( collections. The only reliable way to determine whether an object is iterable Not detect classes that iterate with the _getitem_() method. Iterable ¶ĪBC for classes that provide the _iter_() method.Ĭhecking isinstance(obj, Iterable) detects classes that are registeredĪs Iterable or that have an _iter_() method, but it does Callable ¶ĪBC for classes that provide the _call_() method. Sized ¶ĪBC for classes that provide the _len_() method. ![]() Hashable ¶ĪBC for classes that provide the _hash_() method. Container ¶ĪBC for classes that provide the _contains_() method. Collections Abstract Base Classes – Detailed Descriptions ¶ class collections.abc. Whether an object is iterable is to call iter(obj). Method, but it does not detect classes that iterate with the Registered as Iterable or that have an _iter_() More complex interfaces require registration or directĬhecking isinstance(obj, Iterable) detects classes that are Testing an interface by verifying the required methods are presentĪnd have not been set to None. These ABCs override object._subclasshook_() to support IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES LOSS OF USE, DATA, OR PROFITS OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.New in version 3.9: These abstract classes now support. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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