more-itertools

Python’s itertools library is a gem - you can compose elegant solutions for a variety of problems with the functions it provides. In more-itertools we collect additional building blocks, recipes, and routines for working with Python iterables.

Grouping	chunked, ichunked, chunked_even, sliced, constrained_batches, distribute, divide, split_at, split_before, split_after, split_into, split_when, bucket, unzip, batched, grouper, partition
Lookahead and lookback	spy, peekable, seekable
Windowing	windowed, substrings, substrings_indexes, stagger, windowed_complete, pairwise, triplewise, sliding_window, subslices
Augmenting	count_cycle, intersperse, padded, repeat_each, mark_ends, repeat_last, adjacent, groupby_transform, pad_none, ncycles
Combining	collapse, sort_together, interleave, interleave_longest, interleave_evenly, interleave_randomly, zip_offset, zip_broadcast, flatten, roundrobin, prepend, value_chain, partial_product
Concurrency	concurrent_tee, serialize, synchronized
Summarizing	ilen, unique_to_each, sample, consecutive_groups, run_length, map_reduce, join_mappings, exactly_n, is_sorted, all_equal, all_unique, argmin, argmax, minmax, first_true, quantify, iequals
Selecting	islice_extended, first, last, one, only, strictly_n, strip, lstrip, rstrip, filter_except, map_except, filter_map, iter_suppress, nth_or_last, extract, unique_in_window, before_and_after, nth, take, tail, unique_everseen, unique_justseen, unique, duplicates_everseen, duplicates_justseen, classify_unique, longest_common_prefix, takewhile_inclusive
Math	dft, idft, convolve, dotproduct, matmul, polynomial_from_roots, polynomial_derivative, polynomial_eval, reshape, sum_of_squares, transpose
Integer math	factor, is_prime, multinomial, nth_prime, sieve, totient
Statistics	running_min, running_max, running_mean, running_median, running_statistics
Combinatorics	circular_shifts, derangements, gray_product, outer_product, partitions, set_partitions, powerset, powerset_of_sets
	distinct_combinations, distinct_permutations
	combination_index, combination_with_replacement_index, permutation_index, product_index
	nth_combination, nth_combination_with_replacement, nth_permutation, nth_product
	random_combination, random_combination_with_replacement, random_derangement, random_permutation, random_product
Wrapping	always_iterable, always_reversible, countable, consumer, iter_except, sized_iterator with_iter
Others	locate, rlocate, replace, numeric_range, side_effect, iterate, loops, difference, make_decorator, SequenceView, time_limited, map_if, iter_index, consume, tabulate, repeatfunc, doublestarmap

Getting started

To get started, install the library with pip:

pip install more-itertools

The recipes from the itertools docs are included in the top-level package:

>>> from more_itertools import flatten
>>> iterable = [(0, 1), (2, 3)]
>>> list(flatten(iterable))
[0, 1, 2, 3]

Several new recipes are available as well:

>>> from more_itertools import chunked
>>> iterable = [0, 1, 2, 3, 4, 5, 6, 7, 8]
>>> list(chunked(iterable, 3))
[[0, 1, 2], [3, 4, 5], [6, 7, 8]]

>>> from more_itertools import spy
>>> iterable = (x * x for x in range(1, 6))
>>> head, iterable = spy(iterable, n=3)
>>> list(head)
[1, 4, 9]
>>> list(iterable)
[1, 4, 9, 16, 25]

For the full listing of functions, see the API documentation.

Links elsewhere

Blog posts about more-itertools:

Development

more-itertools is maintained by @erikrose and @bbayles, with help from many others. If you have a problem or suggestion, please file a bug or pull request in this repository. Thanks for contributing!

Version History

The version history can be found in documentation.

Release files for more-itertools 11.1.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for more-itertools 11.1.0
File	Size	Uploaded
more_itertools-11.1.0.tar.gz	145.8 kB	May 22, 2026	Details

Built distribution (wheel)

Table of built distributions (wheels) for more-itertools 11.1.0
File	Interpreter	ABI	Platform	Reset
more_itertools-11.1.0-py3-none-any.whl 72.2 kB May 22, 2026	Python 3	none	any	Details

Total release size: 218.0 kB

Release files / more_itertools-11.1.0.tar.gz

Download URL	more_itertools-11.1.0.tar.gz
Size	145.8 kB
Tags	Source
SHA-256 checksum How to use checksums	`48e8f4d9e7e5878571ecf6f2b4e57634f93cd474cc8cfbd2376f2d11b396e30d`
BLAKE2b-256 checksum How to use checksums	`de1df4da6f02cdffe04d6362210b807146a26044c88d839208aec273bb0d9184`
Upload date	May 22, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.2.0 CPython/3.11.3`

Release files / more_itertools-11.1.0-py3-none-any.whl

Download URL	more_itertools-11.1.0-py3-none-any.whl
Size	72.2 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`4b65538ae22f6fed0ce4874efd317463a7489796a0939fa66824dd542125a192`
BLAKE2b-256 checksum How to use checksums	`e83d1087453384dbde46a8c7f9356eead2c58be8a7bf156bca40243377c85715`
Upload date	May 22, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.2.0 CPython/3.11.3`