On Mon, Mar 26, 2018 at 12:24 PM, Guido van Rossum firstname.lastname@example.org wrote:
I gotta say I'm warming up to := in preference over 'as', *if* we're going to do this at all (not a foregone conclusion at all).
So am I, primarily due to its lack of syntactic ambiguities.
The scope question is far from easy though. I find it particularly grating that an inline assignment occurs in an 'if' statement, its scope is the entire body of the 'if'. If that body is two pages long, by the end of it the reader (or even the writer!) may well have lost track of where it was defined and may be confused by the consequence past the end of the body.
I think this one can be given to style guides. The useful situations (eg regex match capturing) are sufficiently valuable that the less-useful ones can just come along for the ride, just like "x = lambda: ..." is perfectly valid even though "def" would be preferable.