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Issue #23695: Explain the zip() example for clustering a data series into n-length groups.

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Raymond Hettinger 2015-05-13 02:34:38 -07:00
parent 2f3742b0d8
commit 0907a45eb1
1 changed files with 3 additions and 1 deletions
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Doc/library/functions.rst
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@ -1492,7 +1492,9 @@ are always available. They are listed here in alphabetical order.
The left-to-right evaluation order of the iterables is guaranteed. This
makes possible an idiom for clustering a data series into n-length groups
using ``zip(*[iter(s)]*n)``.
using ``zip(*[iter(s)]*n)``. This repeats the *same* iterator ``n`` times
so that each output tuple has the result of ``n`` calls to the iterator.
This has the effect of dividing the input into n-length chunks.
:func:`zip` should only be used with unequal length inputs when you don't
care about trailing, unmatched values from the longer iterables. If those