On Tue, Mar 5, 2019 at 6:07 PM Raymond Hettinger < raymond.hettin...@gmail.com> wrote:
> > > On Mar 5, 2019, at 2:13 PM, Greg Ewing <greg.ew...@canterbury.ac.nz> > wrote: > > > > Rhodri James wrote: > >> I have to go and look in the documentation because I expect the union > operator to be '+'. > > > > Anyone raised on Pascal is likely to find + and * more > > natural. Pascal doesn't have bitwise operators, so it > > re-uses + and * for set operations. I like the economy > > of this arrangement -- it's not as if there's any > > other obvious meaning that + and * could have for sets. > > The language SETL (the language of sets) also uses + and * for set > operations.¹ > So the secret is out: Python inherits a lot from SETL, through ABC -- ABC was heavily influenced by SETL. > ¹ https://www.linuxjournal.com/article/6805 > ² https://www.python.org/dev/peps/pep-0218/ > -- --Guido van Rossum (python.org/~guido)
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