[Python-3000] Is this a bug with list comprehensions or not?
tjreedy at udel.edu
Tue Jul 15 20:52:54 CEST 2008
Guido van Rossum wrote:
>> I don't see how this can be fixed, because there's no way for
>> the list() constructor to know where the StopIteration is coming
> Sounds like a good analysis to me. No bug here. Move along, nothing to see here!
I decided a couple of days ago that the easiest 'fix' would be a minor
doc tweak. Aftef LibRef/Exceptions:
Raised by builtin next() and an iterator‘s __next__() method to signal
that there are no further values."
add "Do not use this anywhere else."
or perhaps "Using this elsewhere may lead to undefined behavior."
I would include this with other suggestions for that section.
Then one wanting to be exact could write something like "Unless
StopIteration is abused, list(genexp) == [genexp], and so on."
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