On 2020-04-21 12:01 p.m., Soni L. wrote:
On 2020-04-21 11:20 a.m., Eric V. Smith wrote:
On 4/21/2020 10:14 AM, Eric V. Smith wrote:
On 4/21/2020 10:10 AM, Soni L. wrote:
I feel like zip could return partial results:
try:
next(zip([0], []))
except StopIteration as exc:
assert StopIteration.args == (0,)
how much would this break?
It would break a lot of code, and so it won't happen.
Actually, I'm not so sure of that, presuming you mean "exc.args", not
"StopIteration.args". And since that's currently set to "()", at
least in my tests, maybe setting it wouldn't break much code. But
it's probably a non-zero amount.
... yeah I did not pay as much attention to that hypothetical code as
I should have.
looking further into it, zip() already guarantees the StopIteration
isn't gonna preserve the original StopIteration, so this should be a
non-breaking change:
https://docs.python.org/3/library/functions.html#zip
Equivalent to:
def zip(*iterables):
# zip('ABCD', 'xy') --> Ax By
sentinel = object()
iterators = [iter(it) for it in iterables]
while iterators:
result = []
for it in iterators:
elem = next(it, sentinel)
if elem is sentinel:
return
result.append(elem)
yield tuple(result)
my proposal is to change that "return" into "return tuple(result)".
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