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README.rst
==============
More Itertools
==============
.. image:: https://coveralls.io/repos/github/erikrose/more-itertools/badge.svg?branch=master
:target: https://coveralls.io/github/erikrose/more-itertools?branch=master
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 <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.chunked>`_, |
| | `sliced <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.sliced>`_, |
| | `distribute <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.distribute>`_, |
| | `divide <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.divide>`_, |
| | `split_at <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.split_at>`_, |
| | `split_before <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.split_before>`_, |
| | `split_after <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.split_after>`_, |
| | `bucket <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.bucket>`_, |
| | `grouper <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.grouper>`_, |
| | `partition <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.partition>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Lookahead and lookback | `spy <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.spy>`_, |
| | `peekable <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.peekable>`_, |
| | `seekable <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.seekable>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Windowing | `windowed <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.windowed>`_, |
| | `stagger <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.stagger>`_, |
| | `pairwise <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.pairwise>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Augmenting | `count_cycle <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.count_cycle>`_, |
| | `intersperse <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.intersperse>`_, |
| | `padded <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.padded>`_, |
| | `adjacent <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.adjacent>`_, |
| | `groupby_transform <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.groupby_transform>`_, |
| | `padnone <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.padnone>`_, |
| | `ncycles <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.ncycles>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Combining | `collapse <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.collapse>`_, |
| | `sort_together <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.sort_together>`_, |
| | `interleave <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.interleave>`_, |
| | `interleave_longest <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.interleave_longest>`_, |
| | `collate <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.collate>`_, |
| | `zip_offset <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.zip_offset>`_, |
| | `dotproduct <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.dotproduct>`_, |
| | `flatten <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.flatten>`_, |
| | `roundrobin <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.roundrobin>`_, |
| | `prepend <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.prepend>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Summarizing | `ilen <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.ilen>`_, |
| | `first <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.first>`_, |
| | `last <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.last>`_, |
| | `one <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.one>`_, |
| | `unique_to_each <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.unique_to_each>`_, |
| | `locate <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.locate>`_, |
| | `rlocate <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.rlocate>`_, |
| | `consecutive_groups <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.consecutive_groups>`_, |
| | `exactly_n <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.exactly_n>`_, |
| | `run_length <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.run_length>`_, |
| | `map_reduce <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.map_reduce>`_, |
| | `all_equal <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.all_equal>`_, |
| | `first_true <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.first_true>`_, |
| | `nth <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.nth>`_, |
| | `quantify <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.quantify>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Selecting | `islice_extended <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.islice_extended>`_, |
| | `strip <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.strip>`_, |
| | `lstrip <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.lstrip>`_, |
| | `rstrip <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.rstrip>`_, |
| | `take <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.take>`_, |
| | `tail <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.tail>`_, |
| | `unique_everseen <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertoo ls.unique_everseen>`_, |
| | `unique_justseen <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.unique_justseen>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Combinatorics | `distinct_permutations <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.distinct_permutations>`_, |
| | `circular_shifts <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.circular_shifts>`_, |
| | `powerset <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.powerset>`_, |
| | `random_product <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.random_product>`_, |
| | `random_permutation <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.random_permutation>`_, |
| | `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>`_, |
| | `nth_combination <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.nth_combination>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Wrapping | `always_iterable <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.always_iterable>`_, |
| | `consumer <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.consumer>`_, |
| | `with_iter <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.with_iter>`_, |
| | `iter_except <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.iter_except>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Others | `replace <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.replace>`_, |
| | `numeric_range <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.numeric_range>`_, |
| | `always_reversible <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.always_reversible>`_, |
| | `side_effect <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.side_effect>`_, |
| | `iterate <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.iterate>`_, |
| | `difference <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.difference>`_, |
| | `make_decorator <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.make_decorator>`_, |
| | `SequenceView <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.SequenceView>`_, |
| | `consume <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.consume>`_, |
| | `accumulate <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.accumulate>`_, |
| | `tabulate <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.tabulate>`_, |
| | `repeatfunc <https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.repeatfunc>`_ |
+------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
Getting started
===============
To get started, install the library with `pip <https://pip.pypa.io/en/stable/>`_:
.. code-block:: shell
pip install more-itertools
The recipes from the `itertools docs <https://docs.python.org/3/library/itertools.html#itertools-recipes>`_
are included in the top-level package:
.. code-block:: python
>>> from more_itertools import flatten
>>> iterable = [(0, 1), (2, 3)]
>>> list(flatten(iterable))
[0, 1, 2, 3]
Several new recipes are available as well:
.. code-block:: python
>>> 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 <https://more-itertools.readthedocs.io/en/latest/api.html>`_.
Development
===========
``more-itertools`` is maintained by `@erikrose <https://github.com/erikrose>`_
and `@bbayles <https://github.com/bbayles>`_, with help from `many others <https://github.com/erikrose/more-itertools/graphs/contributors>`_.
If you have a problem or suggestion, please file a bug or pull request in this
repository. Thanks for contributing!