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[Python-Dev] Call for prudence about PEP-572

Steve Holden steve at holdenweb.com
Sun Jul 8 12:45:24 EDT 2018 
On Sun, Jul 8, 2018 at 10:41 AM, Giampaolo Rodola' <g.rodola at gmail.com>
wrote:

> ​[...]
> I find that (space between the parentheses of a function call statement)
> too unnatural as a place where to put an assignment. It is not even
> "guarded" by a keyword like "if" or  "while" which can help as indicators
> that an assignment may occur. Also, I think it's way too easy to confuse it
> with a keyword argument:
>
>     >>> foo(x = 1)  # keyword arg
>     >>> foo(x := 1)  # assignment + value passing
> ​[...]
>

​But the PEP 8 spellings are​

    foo(x=1)

and

   f(x := 1).

The extra spacing makes it obvious that this isn't a regular named argument.
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