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[Python-Dev] PEP 572: Assignment Expressions

Jeff Allen ja.py at farowl.co.uk
Tue Apr 24 03:14:12 EDT 2018 
On 24/04/2018 02:42, Chris Jerdonek wrote:
> On Mon, Apr 23, 2018 at 4:54 PM, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
>> Tim Peters wrote:
>>> if (diff := x - x_base) and (g := gcd(diff, n)) > 1:
>>>      return g
>> My problem with this is -- how do you read such code out loud?
> It could be...
>
> "if diff, which we define as x - x_base, and g, which ....." etc.
>
That's good. It also makes it natural to expect only a simple name. One 
can "define" a name, but assignment to a complex left-side expression is 
not definition (binding).

Jeff Allen
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