Add a prepend() recipe to teach a chain() idiom #6415
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rhettinger
added
needs backport to 3.6
docs
serhiy-storchaka
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Apr 8, 2018
Doc/library/itertools.rst
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| "Prepend a single value in front of an iterator" | ||
| # prepend(1, [2, 3, 4]) -> 1 2 3 4 | ||
| return chain([value], iterator) | ||
|
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| def prepend(value, iterator): | ||
| "Prepend a single value in front of an iterator" | ||
| # prepend(1, [2, 3, 4]) -> 1 2 3 4 | ||
| return chain([value], iterator) |
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A tuple would be a tiny bit faster, but look more obscure.
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Thanks @rhettinger for the PR 🌮🎉.. I'm working now to backport this PR to: 3.6, 3.7. |
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GH-6421 is a backport of this pull request to the 3.7 branch. |
miss-islington
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(cherry picked from commit 9265dd7) Co-authored-by: Raymond Hettinger <[email protected]>
miss-islington
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(cherry picked from commit 9265dd7) Co-authored-by: Raymond Hettinger <[email protected]>
|
GH-6422 is a backport of this pull request to the 3.6 branch. |
rhettinger
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(cherry picked from commit 9265dd7) Co-authored-by: Raymond Hettinger <[email protected]>
rhettinger
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Apr 8, 2018
(cherry picked from commit 9265dd7) Co-authored-by: Raymond Hettinger <[email protected]>
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See discussion at: https://mail.python.org/pipermail/python-ideas/2018-April/049652.html