• The changes to the type hints for always_iterable in 11.0.0 have been reverted due to reported problems (thanks to ngoldbaum and rhettinger)
• zip_equal was removed in 11.0.0. It had been deprecated and raising DeprecationWarning since 2021, but it's removal shoul have been documented in 11.0.0's release notes. We regret the error.
• running_statistics has been moved from more_itertools.more to more_itertools.recipes. Its docstring was also improved (thanks to mastash3ff and rhettinger)

This release restores pairwise, which was mistakenly removed in 11.0.0 instead of being deprecated. It is now marked as deprecated and will be removed in a future major release. Use itertools.pairwise as a replacement.

Potentially breaking changes

• Python 3.9 support was dropped, since it went EOL on 2025-10-31
• callback_iter is deprecated. It will be removed in a future major release.
• iequals no longer returns True when called with ([], [ANY]) (thanks to rhettinger and pochmann3)
• The pred argument for locate and replace must now be able to
  handle a variable number of arguments. See their docstrings for details. (thanks to veeceey, james-wasson, and pochmann3)
• unique_everseen now raises TypeError when input elements are not hashable.
  The silent fallback mechanism for unhashable inputs has been removed. (thanks to rhettinger and karlicoss)
• windowed now raises ValueError when given a window size of 0 (thanks to rhettinger and brevzin)
• Parameter names for flatten, iter_except, repeatfunc, prepend, transpose,
  and sum_of_squares have been changed. Code that uses these functions will need to be updated if it
  uses keywords for positional arguments. (thanks to rhettinger)

New functions

• concurrent_tee: similar to tee, but with guaranteed threading
  semantics (thanks to rhettinger)
• random_derangement: returns a random derangement of elements from an
  iterable (thanks to rhettinger)
• running_mean: yields the mean of values in an iterable, or in a sliding
  window (thanks to rhettinger)
• running_statistics: provides statistics for the values in an iterable, or
  in a sliding window (thanks to rhettinger)
• serialize: wraps a non-concurrent iterator with a lock to enforce
  sequential access (thanks to rhettinger)
• synchronized: wraps an iterator-returning callable to make its iterators
  thread-safe (thanks to rhettinger)
• sized_iterator: wraps an iterable with a known length and implements __len__ (thanks to assaf127)

Changes to existing functions

• The type hints for always_iterable were improved (thanks to rhettinger and maltevesper)
• A potential bug in callback_iter was fixed
• A bug in exactly_n's handling of negative arguments was fixed (thanks to rhettinger)
• extract`` now accepts a monotonic` argument for improved performance (thanks to rhettinger)
• A bug in numeric_range's handling of negative steps was fixed (thanks to bysiber)
• grouper implementation was updated to match the itertools docs (thanks to rhettinger)
• nth_product, product_index, gray_product,
  partial_product, nth_product, product_index, and
  random_product now accept a repeat keyword argument (thanks to rhettinger)
• powerset_of_sets can now construct frozenset instances (thanks to rhettinger)
• The type hints for stagger were improved (thanks to nathanjmcdougall)
• Memory efficiency was improved for partition was improved (thanks to rhettinger and yueyinqiu)
• Performance for the functions count_cycle, difference,
  random_product, was improved nth_combination, nth_combination_with_replacement,
  nth_permuwas improvedtation, nth_product, product_index,
  random_permutation, substrings, and value_chain was
  improved (thanks to rhettinger)
• Performance for ichunked was improved (thanks to pochmann3 and rhettinger)

Other changes

• The docstrings for several functions were improved (thanks to nathanjmcdougall, olliemath, r266-tech, and rhettinger)

What's Changed

• Fix typo in version history for 10.7.0 by bbayles in #981
• Issue 980: Fix variable names: iterable vs iterator by rhettinger in #982
• Improve docstrings for dft, idft, and multinomial by rhettinger in #983
• Add a note about polynomial endianness by bbayles in #984
• Add SPDX license identifier by cdce8p in #978
• Remove setup.py file by cdce8p in #979
• Include derangements by itself by bbayles in #985
• Add derangements by debruijn in #946
• Issue 986: argmin and argmax by bbayles in #988
• Split-out the integer math functions by rhettinger in #990
• Spelling, grammar, punctuation, and usage by rhettinger in #991
• Fix the return type of more_itertools.batched by qobilidop in #993
• Fix duplicate words in version_history.rst by saadmanrafat in #992
• Improve islice_extended memory usage when start<0 and step>0 by ben42code in #995
• Unittest islice_extended impact on iterated elements lifecycle by ben42code in #996
• convolve() is agnostic to endianness by rhettinger in #997
• Sample simplification by rhettinger in #998
• Issue 1005: Document difference from builtin min() and max(). by rhettinger in #1008
• General cleanups by rhettinger in #1007
• Fix broken link by rhettinger in #1004
• Add option for nth_prime() to be approximated by rhettinger in #1002
• before_and_after improvement by pochmann3 in #1012
• Fast paths instead of applying an identity function by rhettinger in #1018
• Speed-up _complex_sumprod() by rhettinger in #1000
• Improve islice_extended memory usage when stop<0 and step>0 by ben42code in #999
• Add derangements() to the doc indexes by rhettinger in #1020
• Improve readability/findability with combinatoric subsections by rhettinger in #1022
• Fix 1009: Confused docstring for minmax() by rhettinger in #1021
• Improve interleave_longest by pochmann3 in #1027
• Issue 1001: fix last() when reversed is None by inventshah in #1028
• Issue 1029: fix batched IDE/help() docs by inventshah in #1031
• Improve mark_ends by pochmann3 in #1035
• Add usage notes for sample() by rhettinger in #1037
• Fix docstring and comment in private _nth_prime_bounds function by rhettinger in #1036
• Fix linespacing by rhettinger in #1038
• Add running_median by rhettinger in #1039
• running_median() with windowed data by rhettinger in #1040
• Pin furo to 2024.08.06 by bbayles in #1043
• docs: Fix invisible REPL output in HTML dark mode by moreati in #1045
• Use python instead of python3 when running tests by ktbarrett in #1051
• Issue 1044: Add new tool: extract() by rhettinger in #1056
• Test 3.14.0-rc.2 by bbayles in #1060
• unzip: replace custom itemgetter by pochmann3 in #1059
• Add interleave_randomly by ktbarrett in #1048
• Issue 1003: Multidimensional reshape() by rhettinger in #1062
• Get coverage to 100% by rhettinger in #1065
• Improve count_cycle() by rhettinger in #1066
• Clarify how derangements treats duplicate inputs by rhettinger in #1069
• Readability improvement for reshaped() by rhettinger in #1067
• Clean-up tail(). Prefer try/except over the Sized ABC. by rhettinger in #1068
• Version 10.8.0 by bbayles in #1071

Full Changelog: v10.7.0...v10.8.0

See the change log here for details.

• New functions:

  • is_prime and nth_prime were added (thanks to JamesParrott and rhettinger)
  • loops was added (thanks to rhettinger)

• Changes to existing functions:

  • factor was optimized to handle larger inputs and use less memory (thanks to rhettinger)
  • spy was optimized to enable nested calls (thanks to rhettinger)
  • polynomial_from_roots was made non-recursive and able to handle larger numbers of roots (thanks to pochmann3 and rhettinger)
  • is_sorted now only relies on less than comparisons (thanks to rhettinger)
  • The docstring for outer_product was improved (thanks to rhettinger)
  • The type annotations for sample were improved (thanks to rhettinger)

• Other changes:

  • Python 3.13 is officially supported. Python 3.8 is no longer officially supported. (thanks to hugovk, JamesParrott, and stankudrow)
  • mypy checks were fixed (thanks to JamesParrott)

What's Changed

• Optimize all_equal recipe by @bbayles in #899
• Reduce groupby.next calls in all_equal by @bbayles in #903
• Fix types.UnionType by @bbayles in #905
• Version 10.5.0 by @bbayles in #906

Full Changelog: v10.4.0...v10.5.0

What's Changed

• Issue 854: sample improvements by @bbayles in #855
• Issue 858: Use chain and starmap in run_length.decode by @bbayles in #861
• Issue 859: Update totient recipe by @bbayles in #860
• Distinct permutations of incomparable items by @JamesParrott in #834
• Clarify seekable.relative_seek behavior by @bbayles in #863
• Issue 864: Improve _sample_unweighted by @bbayles in #865
• Use log1p for _sample_unweighted by @bbayles in #868
• Issue 862: change relative_seek() behaviour by @dkrikun in #866
• Issue 876: is_sorted clarifications by @bbayles in #877
• Issue 870: counts parameter for sample by @bbayles in #875
• Issue 869: Add a steps argument to circular_shifts by @bbayles in #874
• Issue 871: Add a fast path for sliding_window by @bbayles in #873
• type annotation of windowed_complete corrected by @m472 in #881
• [Docs] Fix strictly_n missing the n parameter by @fakuivan in #886
• Standardize type hints for isinstance's second argument by @jbosboom in #887
• Issue 883: change type hint by @akisatoon1 in #884
• Add type overloads for zip_broadcast by @Pandede in #888
• Issue 889: Optimize triplewise by @bbayles in #891
• Add option strict to sort_together by @Pandede in #892
• Updates for version 10.4.0 by @bbayles in #893

New Contributors

• @JamesParrott made their first contribution in #834
• @dkrikun made their first contribution in #866
• @m472 made their first contribution in #881
• @fakuivan made their first contribution in #886
• @jbosboom made their first contribution in #887
• @akisatoon1 made their first contribution in #884
• @Pandede made their first contribution in #888

Full Changelog: v10.3.0...v10.4.0

What's Changed

• 100% Code Coverage by @haukex in #792
• Remove recursion from collapse by @james-wasson in #796
• Closes #780: add pre/postpend examples in value_chain doc by @bjrtx in #802
• Increase performance of padded by @james-wasson in #805
• Update table of contents by @bjrtx in #808
• Add exactly size of n doc to padded by @james-wasson in #807
• Speed up ichunked by @james-wasson in #793
• Optimize chunked_even itertool by @james-wasson in #816
• Optimize windowed itertool by @james-wasson in #810
• Issue 822: update iter_index docs by @bbayles in #827
• Issue 823: improve totient by @bbayles in #826
• Issue 821: key argument for all_equal by @bbayles in #825
• Update roundrobin implementation by @bbayles in #829
• Issue 820: add powerset_of_sets by @bbayles in #828
• Fix a typo found by codespell by @DimitriPapadopoulos in #830
• Add typing for countable.items_seen attribute. by @aidanholm in #836
• Add join_mappings by @bbayles in #841
• Add doublestarmap (closes #679) by @monk-time in #845
• Add dft and idft by @bbayles in #847
• Changes for version 10.3.0 by @bbayles in #851
• Add unique() by @bbayles in #850

New Contributors

• @james-wasson made their first contribution in #796
• @bjrtx made their first contribution in #802
• @aidanholm made their first contribution in #836
• @monk-time made their first contribution in #845

Full Changelog: v10.2.0...v10.3.0

• New functions

  • iter_suppress (thanks to jaraco, pochmann, and rhettinger)
  • filter_map (thanks to struktured)
  • classify_unique (thanks to haukex)
  • totient (from the itertools docs)
  • reshape (from the itertools docs)

• Changes to existing functions

  • factor, iter_index, sieve, and unique_justseen were updated to match the itertools docs
  • first was was optimized (thanks to pochmann)
  • takewhile_inclusive was was refactored (thanks to eltoder)
  • combination_with_replacement_index was was optimized (thanks to elliotwutingfeng and rhettinger)
  • nth_permutation, nth_combination_with_replacement, combination_index, and combination_with_replacement_index were optimized (thanks to rhettinger)
  • batched now accepts a strict argument (adapted from itertools docs)
  • time_limited was improved for Windows (thanks to haukex)

• Other changes

  • Several typing updates were made (thanks to obaltian and ilai-deutel)
  • Some documentation issues were fixed (thanks to F-park, DimitriPapadopoulos, peterbygrave, shuuji3, eltoder, and homeworkprod)