Exception handling in Python 3.x

[Ethan Furman]

Please don't top-post.

Rob Richardson wrote:

>> -----Original Message-----
>> 
>> 
>> I missed the start of this discussion but there are two simpler ways:
>> 
>> def func(iterable):
>>     for x in iterable:
>>         print(x)
>>         return
>>     raise ValueError("... empty iterable")
>> 
>> Or using 3.x's next's optional second argument:
>> 
>> _nonext=object()
>> def func(iterable):
>>     x = next(iter(iterable), _nonext)
>>     if x is _nonext:
>>         raise ValueError("... empty iterable")
>>     print(x)


 > Arnaud,
 >
 > Wouldn't your first suggestion exit after the first element in
 > iterable?

No, it hit's return instead.

 > And would your second suggestion throw an exception after normal
 > processing of all elements in the interator?

Looks like the second solution doesn't process the entire iterable, just 
it's first element.

~Ethan~