[issue15806] Add context manager for the "try: ... except: pass" pattern

[Ezio Melotti]

Ezio Melotti added the comment:

> As with many context managers, a key benefit here is 
> in the priming effect for readers.

The "focus" is mostly on what it's being executed rather than what it's being ignored though.

"Do this operation and ignore these exceptions if they occur"
vs.
"Ignore these exceptions if they occur while doing this operation."

> I'm not worried that it makes things less explicit - it's pretty
> obvious what a context manager called "ignored" that accepts an
> arbitrary number of exceptions is going to do.

It's still understandable, but while I'm familiar with the semantics of try/except, I wouldn't be sure if e.g. this just ignored those specific exceptions or even their subclasses without checking the doc/code.

> One other thing it does is interact well with ExitStack - you can
> stick this in the stack of exit callbacks to suppress exceptions that
> you don't want to propagate.

This seems a good use case.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15806>
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