Re: [Python-ideas] sentinel_exception argument to `iter`

Feb. 7, 2014


      On 2/6/2014 11:15 PM, Terry Reedy wrote:
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On Fri, Feb 7, 2014 at 1:36 PM, Terry Reedy
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def __next__(self):
   try:
     x = self.func()
   except Exception as exc:
     if isinstance(exc, self.sentinel):
       raise StopIteration from None
         else:
           raise
I just realized that the above is unnecessarily complicated because the 
expression that follows 'except' is not limited to a builtin exception 
class name or tuple thereof. (I have never before had reason to 
dynamically determine the exception to be caught.) So, using a third 
parameter, replace the 5 lines with 2.

     except self.stop_exception:
         raise StopIteration from None
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if x == self.sentinel:
     raise StopIteration
   else:
     return x
-- 
Terry Jan Reedy