[Python-Dev] PEP 572: Assignment Expressions (original) (raw)

Guido van Rossum guido at python.org
Tue Apr 24 23:56:16 EDT 2018

On Tue, Apr 24, 2018 at 8:24 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

I also think it would be good for the PEP to spell out the following semantic invariant for code running in a regular namespace:

rhs = expr assert (target := rhs) is rhs and target is rhs It's the restriction to single names as targets that makes it possible to impose such a strong assertion about what the syntax means.

Can you elaborate? I don't understand what you mean by this.

-- --Guido van Rossum (python.org/~guido) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20180424/4e22905b/attachment.html>

More information about the Python-Dev mailing list