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[3.11] Sync the batched() recipe with the 3.12 implementation #98446

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Oct 19, 2022
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[3.11] Sync the batched() recipe with the 3.12 implementation #98446

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8 changes: 2 additions & 6 deletions Doc/library/itertools.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -887,6 +887,8 @@ which incur interpreter overhead.
def batched(iterable, n):
"Batch data into lists of length n. The last batch may be shorter."
# batched('ABCDEFG', 3) --> ABC DEF G
if n < 1:
raise ValueError('n must be at least one')
it = iter(iterable)
while (batch := list(islice(it, n))):
yield batch
Expand Down Expand Up @@ -1272,12 +1274,6 @@ which incur interpreter overhead.
[['A', 'B'], ['C', 'D'], ['E', 'F'], ['G']]
>>> list(batched('ABCDEFG', 1))
[['A'], ['B'], ['C'], ['D'], ['E'], ['F'], ['G']]
>>> list(batched('ABCDEFG', 0))
[]
>>> list(batched('ABCDEFG', -1))
Traceback (most recent call last):
...
ValueError: Stop argument for islice() must be None or an integer: 0 <= x <= sys.maxsize.
>>> s = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> all(list(flatten(batched(s[:n], 5))) == list(s[:n]) for n in range(len(s)))
True
Expand Down