R. David Murray added the comment:

It occurs to me that one of the problems here is that the UnboundLocalError 
only occurs when the except clause is executed.  Do you think it would be 
helpful and acceptable (in 3.4, as it is a behavior change) to have the 'as' 
variable *always* deleted at the end of the try/except block?  Then you would 
always get the UnboundLocalError, instead of it mysteriously appearing only 
when the except was executed.  

Granted it is a bit weird, but then so is the variable getting deleted in the 
first place.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17792>
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