On Thu, Apr 8, 2021, 11:39 AM anthony.flury via Python-ideas < firstname.lastname@example.org> wrote:
I was wondering whether a worthwhile extension might be to allow the `with` statement to have an `except` and `else` clauses which would have the same
semantics as wrapping the `with` block with a try - for example the above would now look like:
with open('config.cfg', 'r') as cfg: # Process the open file config = load_config(cfg) except FileNotFound: logging.info('Config file not found - using default configuration') except PermissionError: logging.warning('Cannot open config .cfg - using default configuration') config = default_config() else: logging.info('Using config from config.cfg')
Treating the 'with' as an implied `try` would reduce the march to the right - now the key processing of the resource is now indented only one level - and the association of the exception from the `with` block is syntactically clear.
I like the concept, but I don't like just having a plain with block implicitly acting as a try block because you have to read further to actually understand that yes, you're catching exceptions here.
What about "try with ...:"? The combination of the two keywords fits the "try-with-resources" pattern in some other languages and makes it explicit up front that exceptions are about to be caught, while keeping just one level of indentation.