We should interview you for the paper we may be writing for HOPL. On Wed, Jan 3, 2018 at 6:05 PM, Neil Schemenauer <nas-pyt...@arctrix.com> wrote:
> On 2018-01-03, Guido van Rossum wrote: > > I'm sorry, I don't think more research can convince me either way. > > I want all three of return/break/continue to work inside finally > > clauses, despite there being few use cases. > > That's fine. The history of 'continue' inside 'finally' is > interesting. The restriction dates back to at least when Jeremy > committed the AST-based compiler (I have fond memories of hacking on > it with Armin Rigo and others at a Python core sprint). Going > further back, I looked at 1.5.2 and there is the comment in > compile.c: > > TO DO: > ... > XXX Allow 'continue' inside try-finally > > So if we allow 'continue' we will be knocking off a nearly 20 year > old todo item. ;-) > > For giggles, I unpacked a Python 0.9.1 tarball. The source code is > all under 'src' in that version. There doesn't seem to be a > restriction on 'continue' but only because the grammar doesn't > include it! Without doing more research, I think the restriction > could be as old as the 'continue' keyword. > > BTW, the bytecode structure for try/except shown in the compile.c > comments is very simlar to what is currently generated. It is quite > remarkable how well your initial design and implementation have stood > the test of time. Thank you for making it open source. > > Regards, > > Neil > -- --Guido van Rossum (python.org/~guido)
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