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On Sun, Jul 8, 2018 at 10:41 AM, Giampaolo Rodola' <g.rodola@gmail.com> wrote:

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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

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​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.