On Monday, March 3, 2014 5:50:37 PM UTC+5:30, Chris Angelico wrote: > On Mon, Mar 3, 2014 at 10:45 PM, Rustom Mody wrote: > > - cannot do a 'type-incorrect' expression like > >>>> [1,2] + [[3,4],[5]] > > [1, 2, [3, 4], [5]]
> What do you mean by "type-incorrect"? This is adding two lists and > getting back a list. Seems perfectly correct to me. Here's the behavior from an (old version of) haskell. Unfortunately modern versions give a less helpful error message '++' is list-append, '?' is the prompt ? [1,2] + [[3,4],[5]] ERROR: Type error in application *** expression : [1,2] + [[3,4],[5]] *** term : [1,2] *** type : [Int] *** does not match : [[Int]] IOW [1,2,[3,4],[5]] is a type-wise ill-formed expression just as in python [[1,2]) is syntax-wise ill-formed Is it worth having such a restriction? Thats a different argument... -- https://mail.python.org/mailman/listinfo/python-list
