> In retrospect, it appears that the OP should have asked the following > question: From the perspective of Sage, if Python were to have > another arithmetic operator (denoted @) with identical precedence > rules to *, would we use it for anything? Would we extend the > coercion model, etc.? Are there any algebraic structures at all that > have two different "multiplications"? > > If the answers are "yes!" and there are interesting examples, it would > provide support for his proposal. > >
> > My personal answer to the above is: no, no, no... My reasoning is > that if the answer had been "YES!", then we most certainly would have > added such a thing via the preparser. However, I can't remember even > once in 8 years when anybody ever brought up this as a proposed > addition to the preparser (both on lists or in person). His actual > PEP had something claiming we had added something to the preparser, > but that was not a multiplication operator, but simply a backslash > shorthand for matrix inversion, like in Matlab, that nobody uses or > cares about -- I just added it one day for fun in the early days -- > based on no demand. I think of a tensor algebra of an algebra (I could probably come up with others with some thought that might be somewhat contrived but practical). Yet I don't want to modify the preparser to add (for example) # to denote something as specific as a tensor product, must less that we can't override it in subclasses. On a slightly related note, I would like a non-commutative and/or non-associative infix operator. I had no idea such a shorthand was available in Sage. *Goes off to play with it* Best, Travis -- 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 http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
