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

Robert Smallshire rob at sixty-north.com
Fri Apr 20 02:32:56 EDT 2018

If you restrict the idea to 'if' and 'while', Why not render this using the existing 'as' form for binding names, already used with 'except' and 'with':

while learner.get(static_hint) as points:
    learner.feed(f(points))

The equivalent for 'if' helps with the regex matching case:

if re.match(r"...") as m:
    print(m.group(1))

I considered proposing these two forms in a PEP a few years ago, but never got around to it. To my eye, they fit syntactically into the language as-is, without introducing new symbols, operators or keywords, are consistent with existing usage, and address two relatively common causes of displeasing Python code.

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