[Python-Dev] (name := expression) doesn't fit the narrative of PEP 20

[Greg Ewing]

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:


    x := expr # doesn't print anything

    (x := expr) # prints the result

I.e. special-case a stand-alone assignment, but
allow overriding that with parens if needed.

-- 
Greg