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bpo-40806: Clarify that itertools.product immediately consumes its inpt (GH-20492)

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Ramil Nugmanov 2020-05-28 19:46:22 +03:00 • committed by GitHub
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Doc/library/itertools.rst
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@ -563,6 +563,9 @@ loops that truncate the stream.
for prod in result:
yield tuple(prod)
Before :func:`product` runs, it completely consumes the input iterables,
keeping pools of values in memory to generate the products. Accordingly,
it only useful with finite inputs.
.. function:: repeat(object[, times])