08.04.21 17:59, anthony.flury via Python-ideas пише:
> 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')
A year or two ago I proposed the same syntax with different semantic: to
catch only exceptions in the context manager, not in the with block.
Exceptions in the with block you can catch by adding try/except around
the with block, exceptions in the with block and the context manager you
can catch by adding try/except around the with statement, but there is
no currently way to catch only exceptions in the context manager.
It is quite a common problem, I encounter it several times per year
since then. I still have a hope to add this feature, and it will
conflict with your idea.
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