Sounds like you should just submit a bug report (and a PR with a fix if you feel up to it). Since a relative seek to position p is typically just implemented as an absolute seek to position f.tell()+p, this looks like an odd omission, and I can't remember a reason for it. Looking at the code, the fix looks pretty easy -- update _io_StringIO_seek_impl() in Modules/_io/stringio.c.
On Thu, Jan 16, 2020 at 7:19 PM Random832 <random...@fastmail.com> wrote: > Absolute seeking on a StringIO treats the offset as a character count > regardless of the contents, so given that there is no "pretend it's UTF-8 > and advance a given number of 'bytes'" machinery anyway, there's no reason > not to allow seeking relative to the current location or the end of the > 'file'. The error message is also misleading: "Can't do nonzero > cur-relative seeks" even when the seek is relative to the end. > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/SR5XTK7KDIHFT4KCHEV7XFGYFZ335TSQ/ > 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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