On Thu, Apr 26, 2018 at 10:34:29PM +1200, Greg Ewing wrote: > Antoine Pitrou wrote: > >Well, how do languages where assignment is an expression returning the > >assigned value make their REPLs work? I'm sure they don't inflict that > >on their users, so it's certainly a solvable problem. > > I can't think of any such language that has a REPL > offhand, but here's a possible solution:
Here's the Rhino Javascript REPL: [steve@ando ~]$ rhino Rhino 1.7 release 0.7.r2.3.el5_6 2011 05 04 js> x = (a = 99) + 1 100 Here's the standard Ruby REPL: [steve@ando ~]$ irb irb(main):001:0> x = (a = 99) + 1 => 100 So both of these REPLs do print the result of the expression. R, on the other hand, doesn't print the results of assignment expressions: > x <- (a <- 99) + 1 > c(x, a) [1] 100 99 Rhino, however, does suppress printing if you prefix the variable with "var" or "const". -- Steve _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
