April 21, 2018
10:47 a.m.
On 2018-04-17 08:46, Chris Angelico wrote:
Having survived four rounds in the boxing ring at python-ideas, PEP 572 is now ready to enter the arena of python-dev.
I would like to suggest one more motivating example for "Capturing condition values": multiple regex matches with 'elif'. if match := re.search(pat1, text): print("Found one:", match.group(0)) elif match := re.search(pat2, text): print("Found two:", match.group(0)) elif match := re.search(pat3, text): print("Found three:", match.group(0)) Without assignment expressions, you have an annoying choice between a cascade of 'else's with an ever-increasing indent and evaluating all the matches up front (so doing unnecessary work). -M-