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Project description
A set of utility functions for iterators, functions, and dictionaries.
[](https://travis-ci.org/pytoolz/toolz)
LICENSE
New BSD. See [License File](LICENSE.TXT).
Install
toolz is on the Python Package Index (PyPi):
pip install toolz
or
easy_install toolz
Structure and Heritage
toolz is implemented in three parts:
[itertoolz](https://github.com/pytoolz/toolz/blob/master/toolz/itertoolz/core.py), for opertions on iterables. Examples: groupby, unique, interpose,
[functoolz](https://github.com/pytoolz/toolz/blob/master/toolz/functoolz/core.py), for higher-order functions. Examples: memoize, curry, comp
[dicttoolz](https://github.com/pytoolz/toolz/blob/master/toolz/dicttoolz/core.py), for operations on dictionaries. Examples: assoc, update-in, merge.
These functions come from the legacy of functional languages for list processing. They interoperate well to accomplish common complex tasks.
Example
This builds a standard wordcount function from pieces within toolz:
>>> def stem(word): ... """ Stem word to primitive form """ ... return word.lower().rstrip(",.!:;'-\"").lstrip("'\"")>>> from toolz import comp, frequencies >>> from functools import partial >>> wordcount = comp(frequencies, partial(map, stem), str.split)>>> sentence = "This cat jumped over this other cat!" >>> wordcount(sentence) {'this': 2, 'cat': 2, 'jumped': 1, 'over': 1, 'other': 1}
Dependencies
toolz supports Python 2.6+ and Python 3.2+ with a common codebase. It is pure Python and requires no dependencies beyond the standard library.
See Also
[Underscore.js](http://underscorejs.org): A similar library for JavaScript
[Enumerable](http://ruby-doc.org/core-2.0.0/Enumerable.html): A similar library for Ruby
[Clojure](http://clojure.org): A functional language whose standard library has several counterparts in toolz
[itertools](http://docs.python.org/2/library/itertools.html): The Python standard library for iterator tools
[functools](http://docs.python.org/2/library/functools.html): The Python standard library for function tools
Contributions Welcome
toolz aims to be a repository for utility functions, particularly those that come from the functional programming and list processing traditions. We welcome contributions that fall within this scope and encourage users to scrape their util.py files for functions that are broadly useful.
Please take a look at our [issue page](https://github.com/pytoolz/toolz/issues) for contribution ideas.
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