On 1/16/2014 3:31 AM, Serhiy Storchaka wrote:
16.01.14 08:05, Guido van Rossum написав(ла):
In this specific case it's clear to me that the special-casing of
negative count is intentional -- presumably it emulates sequence
repetition, where e.g. 'a'*-1 == ''.
In this specific case it's contrary to sequence repetition. Because
repeat('a', -1) repeats 'a' forever.
'Forever' only when the keyword is used and the value is -1.
In 3.4b2
>>> itertools.repeat('a', -1)
repeat('a', 0)
>>> itertools.repeat('a', times=-1)
repeat('a')
>>> itertools.repeat('a', times=-2)
repeat('a', -2)
> This is a point of Vajrasky's issue [1].
The first line is correct in both behavior and representation.
The second line behavior (and corresponding repr) are wrong.
The third line repr is wrong but the behavior is like the first.
[1] http://bugs.python.org/issue19145
--
Terry Jan Reedy
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