[Python-ideas] Null coalescing operators

Terry Reedy tjreedy at udel.edu
Mon Sep 21 22:23:03 CEST 2015

On 9/21/2015 10:56 AM, Paul Moore wrote:

> By the way, in your example you're passing on the "none or useful"
> property by making substr be either the matched value or None.

I agree that dealing with None immediately is better.

  In real
> life, I'd probably do something more like
> mo = re.match(needle, haystack)
> if mo:
>      process(mo.group())
> else:
>      no_needle()

     process(re.match(needle, haystack).group())
except AttributeError:  # no match

is equivalent unless process can also raise AttributeError.

Terry Jan Reedy

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