The walrus operator hardly changes that example at all:
if m := re.match(pattern1, line):
do_stuff(m.group(1))
else:
if m := re.match(pattern2, line):
do_other_stuff(m.group(2))
else:
if m := re.match(pattern3, line):
do_things(m.groups())
else:
m = ...
I've found `:=` useful in the headers of `while` loops, but that's about it. The complexity that walrus adds to the language far outweighs its usefulness.
