[Python-ideas] Null coalescing operators

[Terry Reedy]

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()

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

is equivalent unless process can also raise AttributeError.


-- 
Terry Jan Reedy