[Python-Dev] Re: Python-Dev Digest, Vol 204, Issue 129
On 24/06/2020 20:38, Guido van Rossum wrote: > Everyone, > > If you've commented and you're worried you haven't been heard, please=20 > add your issue *concisely* to this new thread. Note that the following=20 > issues are already open and will be responded to separately; please=20 > don't bother commenting on these until we've done so: > > - Alternative spellings for '|' > - Whether to add an 'else' clause (and how to indent it) > - A different token for wildcards instead of '_' > - What to do about the footgun of 'case foo' vs. 'case .foo' > > (Note that the last two could be combined, e.g. '?foo' or 'foo?' to=20 > mark a variable binding and '?' for a wildcard.) Can we extend the syntax for the match statement from match_stmt: "match" expression ':' NEWLINE INDENT case_block+ DEDENT to match_stmt: "match" expression ['as' NAME] ':' NEWLINE INDENT case_block+ DEDENT with the same meaning as in "with"? So the variable with the NAME assumes the value of the expression. That way I won’t have to use the walrus at every case where I need the full result of the expression. It could even be used to get rid of the walrus_pattern entirely. Example: match nested_data[index].attribute as foo: ... case SomeClass(…): bar(foo) … case AnotherClass(…): baz(foo) … ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/IJCTESGMZF6NI7ZTSGLRIXLPA7EN4TF2/ Code of Conduct: http://python.org/psf/codeofconduct/
[Python-Dev] Re: Python-Dev Digest, Vol 204, Issue 129
> On 25 Jul 2020, at 03:44, Rob Cliffe wrote: > > Without arguing for or against allowing a capture variable, IMO rather > than syntax like > match into : > it would be far better (and not require a new keyword) to write this as > with as match : > > On 24/06/2020 20:38, Guido van Rossum wrote: >> Everyone, >> >> If you've commented and you're worried you haven't been heard, please=20 >> add your issue *concisely* to this new thread. Note that the following=20 >> issues are already open and will be responded to separately; please=20 >> don't bother commenting on these until we've done so: >> >> - Alternative spellings for '|' >> - Whether to add an 'else' clause (and how to indent it) >> - A different token for wildcards instead of '_' >> - What to do about the footgun of 'case foo' vs. 'case .foo' >> >> (Note that the last two could be combined, e.g. '?foo' or 'foo?' to=20 >> mark a variable binding and '?' for a wildcard.) >> We already have 'with' for contexts. We already have patterns with 'as': - except expression "as" identifier ":" - "import" module "as" identifier - "with" expression "as" target So I think this would be quite confusing. ___ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/U27FYK4U34M7FGDIUTDQZCNAU2MV7UNW/ Code of Conduct: http://python.org/psf/codeofconduct/
