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Split an iterable into multiple using arbitrary predicates.

Project description

Split an iterable into multiple using arbitrary predicates.

This package comes with a single function: multisplitby.multi_split_by.

For all lists values and predicates, the following conditions are always true:

  1. 1 + len(predicates) = len(list(multi_split_by(values, predicates)))

  2. values == itertools.chain.from_iterable(multi_split_by(values, predicates))

Normal usage with one predicate:

>>> values = range(4)
>>> predicates = [lambda x: 2 < x]
>>> list(map(list, multi_split_by(values, predicates)))
[[0, 1, 2], [3]]

Normal usage with several predicates:

>>> values = range(9)
>>> predicates = [lambda x: 2 < x, lambda x: 4 < x, lambda x: 7 < x]
>>> list(map(list, multi_split_by(values, predicates)))
[[0, 1, 2], [3, 4], [5, 6, 7], [8]]

If no values are given, will result in |predicates| + 1 generators, all yielding empty lists.

>>> values = []
>>> predicates = [lambda x: 2 < x, lambda x: 4 < x, lambda x: 7 < x]
>>> list(map(list, multi_split_by(values, predicates)))
[[], [], [], []]

If no predicates are given, will result in a single generator that yields the original list:

>>> values = range(4)
>>> predicates = []
>>> list(map(list, multi_split_by(values, predicates)))
[[0, 1, 2, 3]]

Installation

Install from PyPI with:

$ pip install multisplitby

or get the latest code from GitHub with:

$ git clone https://github.com/cthoyt/multisplitby.git
$ cd multisplitby
$ pip install -e .

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