"Stephen J. Turnbull" <step...@xemacs.org> writes:
> Ethan Furman writes:
> > On 02/21/2014 07:46 PM, Chris Angelico wrote:
> > >
> > > but not this:
> > >
> > > value = expr except Exception: default except Exception: default
> >
> > This should be the way it works. Nothing is gained in readability
> > by turning a try with multiple except statements into an
> > expression.
>
> Examples have been given several times. In general, if 'expr' is a
> function call, it may well have a couple of different ways to fail
> which imply different default values.
>
> interpolable = func(key) except TypeError: "not a string: %s" % key \
> except KeyError: "no such key: %s" % key
> print("Some message that refers to '%s' % interpolable")
>
> versus
>
> try:
> interpolable = func(key)
> except TypeError:
> interpolable = "not a string: %s" % key
> except KeyError:
> interpolable = "no such key: %s" % key
> print("Some message that refers to '%s' % interpolable")
I think the following suggestion from elsewhere in the thread would look
even better in this case:
interpolable = func(key) except (TypeError: "not a string: %s" % key,
KeyError: "no such key: %s" % key)
print("Some message that refers to '%s' % interpolable")
It does not require the backslash, it is shorter, and it can still be
chained:
interpolable = func(key) except (TypeError: "not a string: %s" % key,
KeyError: defaults[key]
except (KeyError: "no such key: %s" %
key))
print("Some message that refers to '%s' % interpolable")
Best,
-Nikolaus
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