A functional standard library for Python
Project description
A set of utility functions for iterators, functions, and dictionaries.
See the PyToolz documentation at http://toolz.readthedocs.org
LICENSE
New BSD. See License File.
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, for operations on iterables. Examples: groupby, unique, interpose,
functoolz, for higher-order functions. Examples: memoize, curry, compose
dicttoolz, 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.
Read our API Documentation for more details.
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 compose, frequencies, partial
>>> wordcount = compose(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.
It is, in short, a light weight dependency.
See Also
Underscore.js: A similar library for JavaScript
Enumerable: A similar library for Ruby
Clojure: A functional language whose standard library has several counterparts in toolz
itertools: The Python standard library for iterator tools
functools: 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 for contribution ideas.
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