* **It's a richer interface than the basic sequence.**
* **Extending it generates iter(), contains(), reversed(), index() and count().**
* **Unlike `'abc.Iterable'` and `'abc.Collection'`, it is not a duck type. That is why `'issubclass(MySequence, abc.Sequence)'` would return False even if MySequence had all the methods defined.**
* **Unlike `'abc.Iterable'` and `'abc.Collection'`, it is not a duck type. That is why `'issubclass(MySequence, abc.Sequence)'` would return False even if MySequence had all the methods defined. It however recognizes any list, tuple, range, str, bytes, bytearray and memoryview, because they are registered as Sequence's virtual subclasses.**
<li><strong>It's a richer interface than the basic sequence.</strong></li>
<li><strong>Extending it generates iter(), contains(), reversed(), index() and count().</strong></li>
<li><strong>Unlike <codeclass="python hljs"><spanclass="hljs-string">'abc.Iterable'</span></code> and <codeclass="python hljs"><spanclass="hljs-string">'abc.Collection'</span></code>, it is not a duck type. That is why <codeclass="python hljs"><spanclass="hljs-string">'issubclass(MySequence, abc.Sequence)'</span></code> would return False even if MySequence had all the methods defined.</strong></li>
<li><strong>Unlike <codeclass="python hljs"><spanclass="hljs-string">'abc.Iterable'</span></code> and <codeclass="python hljs"><spanclass="hljs-string">'abc.Collection'</span></code>, it is not a duck type. That is why <codeclass="python hljs"><spanclass="hljs-string">'issubclass(MySequence, abc.Sequence)'</span></code> would return False even if MySequence had all the methods defined. It however recognizes any list, tuple, range, str, bytes, bytearray and memoryview, because they are registered as Sequence's virtual subclasses.</strong></li>
Jure Šorn
2 years ago