Perhaps for reference, maxima_lib can only be instantiated once and, since sage.interfaces.maxima_lib is only referenced at start-up via lazy_import (which has its own problems), the instantiation happens upon import of sage.interfaces.maxima_lib:
sage: import sage.interfaces.maxima_lib sage: sage.interfaces.maxima_lib.MaximaLib() RuntimeError: Maxima interface in library mode can only be instantiated once sage: sage.interfaces.maxima_lib.maxima #already instantiated Maxima_lib The pexpect interface, on the other hand, can be instantiated as much as you want, and separate instances are *not* equal (and they shouldn't be, because generally they would be in quite different states): sage: M1=sage.interfaces.maxima.Maxima() sage: M2=sage.interfaces.maxima.Maxima() sage: M1 == M2 False I would say it would be reasonable to have R_lib follow the same pattern. If it is deemed that maintaining a pexpect interface to R is not worthwhile, then that's a separate decision. On Tuesday, December 25, 2018 at 1:04:06 PM UTC-8, Andrey Novoseltsev wrote: > > On Tuesday, 25 December 2018 13:53:07 UTC-7, Timo Kaufmann wrote: >> >> Am Dienstag, 25. Dezember 2018 16:32:10 UTC+1 schrieb Andrey Novoseltsev: >>> >>> It does not affect me personally at all, my use of R is limited to >>> making it work in SageMathCell. But if there is only one instance, then I >>> think R() should always return that single instance rather than a new >>> wrapper each time and perhaps it should be deprecated and removed from the >>> global namespace so that interaction goes through the precreated r object >>> only. >>> >> >> Not sure how deprecation in sage works. Wouldn't that needlessly break >> some scripts? >> >> > Depends on your definition of needlessly - if there is no point anymore to > call R(), what's the point in keeping doing it? And if the use case before > was to create two different instances, then it is highly desirable to break > those scripts to make sure that there are no unexpected and hard to debug > consequences. > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
