News for hackers. Stuff that matters.

A comment on PEP 572: Python assignment expressions has been accepted. Parent comment

Re:PEP 572: Python assignment expressions has been accepted by arketyp on Tuesday July 03, 2018 @05:33AM (#17448736)
>You could argue everything above machine language is syntactic sugar.

The sugar is sprinkled on top of syntax, the stuff the parser deals with. Typing a += 1 instead of a = a + 1 is sugar because it parses the same. This assignment syntax seems different. IMHO.

[ Parent | on HN ]
Re:PEP 572: Python assignment expressions has been accepted by blattimwind on Tuesday July 03, 2018 @08:27AM (#17449560)
> because it parses the same

Does not. One is addition, the other is in-place addition; they're different things and can behave differently. E.g. in "a += b" and "a = a + b", the former might not construct an intermediate object, but mutate the existing a.

[ Parent | on HN ]
Re:PEP 572: Python assignment expressions has been accepted by ben-schaaf on Tuesday July 03, 2018 @10:45AM (#17450607)
To be more specific for python: "a += b" -> "a = a.__iadd__(b)" "a = a + b" -> "a = a.__add__(b)"

"__iadd__" and "__add__" can do whatever they want.

[ Parent | on HN ]