On 02/21/2014 10:57 PM, Stephen J. Turnbull wrote:
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 latter begs to be written as the former.
Okay, that's the best example of that style I've seen so far (sorry, Chris, if something similar was in the PEP and I
missed it). I will yield the point that something is gained -- still, I think it is a small something compared to
converting a nested except statement into an expression, and if only allowing one or the other makes the whole thing
simpler I vote for the nested excepts to be converted, not the already easily read multiple excepts.
--
~Ethan~
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