On 2018-07-22 09:01:58 -0400, David Mertz wrote: > On Sun, Jul 22, 2018, 8:11 AM Steven D'Aprano <st...@pearwood.info> wrote: > To me, the ?? operator seems like a clear and obvious win. The other > variants are more complex and the benefit is not as obvious to me, so I > haven't decided where I stand on them. > > > Yes, that is the only one I'm merely -0 on. The others I'm -1000.
For me it's the opposite. ?? is +0: While I use the equivalent // in
Perl quite frequently, the benefit isn't all that great.
But ?. and ?[] are really useful.
Sequences like request.context.user.email occur quite frequently in
code, and I find
request?.context?.user?.email
much more readable than
email = None
context = request.context
if context is not None:
user = context.user
if user is not None:
email = user.email
Note that
request and request.context and request.context.user and
request.context.user.email
is not equivalent even if you assume that None is the only possible
falsey value in this context. It evaluates request 4 times,
request.context 3 times, and request.context.user 2 times.
hp
--
_ | Peter J. Holzer | we build much bigger, better disasters now
|_|_) | | because we have much more sophisticated
| | | h...@hjp.at | management tools.
__/ | http://www.hjp.at/ | -- Ross Anderson <https://www.edge.org/>
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