Morten W. Petersen wrote:
> Hi there.
>
> I was adding a port specification feature to my surveil project as shown
> here:
>
>
https://github.com/morphex/surveil/commit/703318f87c4c450a37944b565a10718ef27b57b4
>
> A bit later I was surprised when the script raised an exception, and that
> I had to catch a ValueError instead of an IndexError:
>
>
https://github.com/morphex/surveil/commit/d5c49c54d4037557aaca1f78178b76441853c7af
>
> I've been reading up on a bit of C++, Assembler etc. lately, so maybe my
> mind expected an IndexError because of that, but isn't it logical that the
> string is parsed and split, and then later the unpacking operation fails
> with an IndexError?
You might think that
a, b = c
is equivalent to
a = c[0]
b = c[1]
but the c above can be an arbitrary iterable:
>>> a, b = iter("ab")
>>> a, b
('a', 'b')
>>> a, b = iter("abc")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: too many values to unpack (expected 2)
So there is not necessarily a lookup by index.
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