[Python-ideas] Possible PEP regarding the use of the continue keyword in try/except blocks

Oscar Benjamin oscar.j.benjamin at gmail.com
Mon Jan 7 07:10:33 EST 2019

On Mon, 7 Jan 2019 at 09:27, Chris Angelico <rosuav at gmail.com> wrote:
> On Mon, Jan 7, 2019 at 7:11 PM Anders Hovmöller <boxed at killingar.net> wrote:
> >
> >
> > > This proposal is basically about introducing goto to the language.
> >
> > A bit hyperbolic but I agree that it has the same problem as goto. But the specific suggested solution is not something we should be restricted so rigidly to in this discussion. One could for example see another solution to the same problem:
> >
> > with supress_raise(TypeError, ValueError):
> >    do_the_things()
> >
> > I have no idea how to actually implement this though and it's also a bad idea but I think we should first find the best idea to solve the underlying pain point then talk about rejecting or supporting that.
> >
> You mean like this?
> https://docs.python.org/3/library/contextlib.html#contextlib.suppress

That doesn't do what the OP requested. It suppresses errors from the
outside but doesn't resume execution in the block so e.g.:

a = b = None
with suppress(ValueError):
    a = float(str_a)
    b = float(str_b)

The OP wants the the b= line to execute even if the a= line raises an exception.


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