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Mon Jul 9 03:26:33 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-July/154538.html

On 2018-07-07, 15:48 GMT, Guido van Rossum wrote:
>     if validate(name := re.search(pattern, line).group(1)):
>         return name

Except there is no error handling for situations when 
re.search() returns None, so one shouldn't use it anyway (most 
of the time). Which seems to me like another nice example why 
one should stay away from this style as much as possible. I am 
too lazy to be tempted into this 
nice-example-terrible-production-code world.

Best,

Matěj
-- 
https://matej.ceplovi.cz/blog/, Jabber: mcepl at ceplovi.cz
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[Python-Dev] Call for prudence about PEP-572