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 spy, lookback 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](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.distinct_combinations),
              [distinct_permutations](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.distinct_permutations)

              [combination_index](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.combination_index),
              [combination_with_replacement_index](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.combination_with_replacement_index),
              [permutation_index](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.permutation_index),
              [product_index](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.product_index)

              [nth_combination](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.nth_combination),
              [nth_combination_with_replacement](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.nth_combination_with_replacement),
              [nth_permutation](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.nth_permutation),
              [nth_product](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.nth_product)

              [random_combination](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.random_combination),
              [random_combination_with_replacement](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.random_combination_with_replacement),
              [random_derangement](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.random_derangement),
              [random_permutation](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.random_permutation),
              [random_product](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.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.