On 9/28/16 12:19 PM, Jack Stouffer wrote:
On Tuesday, 27 September 2016 at 09:30:10 UTC, Dicebot wrote:
https://github.com/dlang/DIPs/blob/master/DIPs/DIP1002.md
PR: https://github.com/dlang/DIPs/pull/43
Abstract:
In Python, the try/catch/finally syntax is augmented with an
additional clause, termed else. It is a fantastically useful addition
to the conventional syntax. It works like this:
I support this addition because, while it's possible to mimic this
behavior now, this makes code cleaner.
This rough count:
git grep '^ *try' | wc -l
reveals 187 uses of "try" in Phobos. Of these, how many could be
improved? Looking into that and also on a selection of dub projects
would strengthen the argument. Assertions such as "makes the code
cleaner" are likely to add value only if backed up by evidence (case
studies, realistic examples).
I will also post some rationale from the Python docs:
"The use of the else clause is better than adding additional code to the
try clause because it avoids accidentally catching an exception that
wasn’t raised by the code being protected by the try/except statement."
https://docs.python.org/3/tutorial/errors.html#handling-exceptions
Porting motivating arguments from other languages is helpful only if put
in the context of D, e.g. Python does not have "scope" statements, which
makes matters different across the two languages.
Andrei
