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

Greg Ewing greg.ewing at canterbury.ac.nz
Tue Apr 24 03:12:52 EDT 2018

Chris Jerdonek wrote:

if (diff := x - xbase) and (g := gcd(diff, n)) > 1:

"if diff, which we let equal x - xbase, and g, which ..." or "if diff, which we set equal to x - xbase, and g, which ...." or "if diff, which we define to be x - xbase, and g, which ...." or "if diff, which we define as x - xbase, and g, which ....." etc.

How about "being" as a keyword:

if (diff being x - x_base) and (g being gcd(diff, n)) > 1: return g

An advantage is that you're not likely to be tempted to write

diff being x - x_base

on its own as a statement.

-- Greg

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