I don’t like the => syntax for delayed default argument. It looks like a lambda and it’s confusing. The @ symbol is more readable. Like this @var=len(a) or even var@=len(a). The function decorator changes the behavior of the function. Similarly this @ default argument will change the argument value to this assignment if a value is not supplied. Abdulla
Sent from my iPhone > On 25 Oct 2021, at 1:03 PM, Chris Angelico <[email protected]> wrote: > > On Mon, Oct 25, 2021 at 7:51 PM Barry Scott <[email protected]> wrote: >> >> Clarification please: >> >> What is the bytecode that will be generated? > > Equivalent to: > > if argument not provided: > argument = <expr> > > except that we don't have a way of saying "not provided". > >> Does the bytecode only run the default code if the argument is missing? > > Yes. It is for default values, not for transforming. > >> And missing is not the same as is None? > > Most assuredly not - that's part of the point. The semantics are > closer to the "dedicated sentinel" idiom, but there is no value which > can be passed which triggers this. > >> Also have you add the @var=default suggestion from Stephen to the syntax >> options. >> I'm +1 on the @ syntax as it is easier to pick up on and the other reasons >> that Stephen >> provided. > > Not really a fan, but I guess I can add it as an alternative. > > ChrisA > _______________________________________________ > Python-ideas mailing list -- [email protected] > To unsubscribe send an email to [email protected] > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/[email protected]/message/NLAYWMGR5O27VH4CA4IMFFYPFH4CCFW2/ > Code of Conduct: http://python.org/psf/codeofconduct/
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