[Python-Dev] PEP 463: Exception-catching expressions

Glenn Linderman v+python at g.nevcal.com
Sat Feb 22 03:08:22 CET 2014

On 2/21/2014 5:06 PM, Jan Kaliszewski wrote:
> Or even (still being my favorite):
>     msg = seq[i] except (IndexError: "nothing") 

This syntax actually has a benefit: the parenthesized syntax after 
except could become a list, to allow handling different exceptions from 
the tried expression with different results:

msg = seq[dictionary[i]] except (IndexError: "nothing", KeyError: 
"serious problems")

And still allows nesting:

msg = seq[i] except (IndexError: dictionary[i] except (KeyError: "no 
fallback data for %s" % i))
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