Python is for simplicity. It would be really cool to do such shortcuts instead of import itertools; itertools.product everytime.
On Fri, Jul 26, 2019 at 2:55 PM Greg Ewing <greg.ew...@canterbury.ac.nz> wrote: > Andrew Barnert via Python-ideas wrote: > > The usual set-theoretic definition of tuples is just recursively as > ordered > > pairs: () is 0, (a) is a, (a, b) is <a, b>, (a, b, c) is <<a, b>, c>, > etc. > > So, you don’t have to gloss over anything; s1 * s2 * s3 gives you > elements > > ((a, b), c), but those are identical to elements (a, b, c). > > But that makes the cartesian product operator non-associative, since > s1 * (s2 * s3) would be a set of <a, <b, c>>. I still maintain that > *in practice* mathematicians ignore the issue and consider that > ((a, b), c), (a, (b, c)) and (a, b, c) are just different ways of > writing essentially the same thing. > > A programming language *could* be designed with a tuple type for > which that is literally true, but Python wasn't designed that way. > And I don't think it's a problem at all. You can easily write a > comprehension that gives you whatever kind of cartesian product > you want. > > -- > Greg > _______________________________________________ > 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/CBXVP365LCLKKZV4FYB57CXSMW376VXW/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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