How about just presenting pseudo code with the caveat that that's for the base str and bytes classes only, and then stipulating that for subclasses the return value is still a str/bytes/bytearray instance, and leaving it at that? After all the point of the Python code is to show what the C code should do in a way that's easy to grasp -- giving a Python implementation is not meant to constrain the C implementation to have *exactly* the same behavior in all corner cases (since that would lead to seriously contorted C code).
On Fri, Mar 27, 2020 at 1:02 PM Dennis Sweeney <sweeney.dennis...@gmail.com> wrote: > I was trying to start with the the intended behavior of the str class, > then move on to generalizing to other classes, because I think completing a > single example and *then* generalizing is an instructional style that's > easier to digest, whereas intermixing all of the examples at once can get > confused (can I call str.removeprefix(object(), 17)?). Is something missing > that's not already there in the following sentence in the PEP? > > Although the methods on the immutable ``str`` and ``bytes`` types may make > the aforementioned optimization of returning the original object, > ``bytearray.removeprefix()`` and ``bytearray.removesuffix()`` should always > return a copy, never the original object. > > Best, > Dennis > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/IO33NJUQTN27TU342NAJAAMR7YGEPQRE/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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