Exception handling in Python 3.x

[Rob Richardson]

Arnaud,

Wouldn't your first suggestion exit after the first element in iterable?
And would your second suggestion throw an exception after normal
processing of all elements in the interator?

RobR

-----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
-- 
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