[Python-ideas] Enabling / disabling optional type hinting

[Andre Roberge]

On Sat, Mar 23, 2019 at 6:26 PM Ned Batchelder <ned at nedbatchelder.com>
wrote:

> On 3/23/19 1:37 PM, Gregory P. Smith wrote:
> > Sure, someone is going to typo and omit the = from a := assignment in
> > 3.8 but the walrus is unlikely to be used outside of an conditional or
> > loop test context so this seems like a made up problem.
>
My original message was referring to someone writing ":" instead of "=" by
mistake -- nothing to do with the walrus assignment, but rather using the
same notation to assign a value to a key as they would when defining a dict.

André Roberge



>
> Walruses aren't allowed as a top-level expression anyway:
>
>      Python 3.8.0a2 (default, Feb 25 2019, 17:15:37)
>      [Clang 10.0.0 (clang-1000.10.44.4)] on darwin
>      Type "help", "copyright", "credits" or "license" for more information.
>      >>> d["answer"] := 42
>        File "<stdin>", line 1
>          d["answer"] := 42
>                      ^
>      SyntaxError: invalid syntax
>
>
> --Ned.
>
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