A collection of predicate factories, functions, and partials, for functional programming.

The predicates module provides a variety of predicates, predicate factories, and predicate partials.

"A predicate is a function that returns the truth value of some condition."

-- Andrew M. Kuchling,

Python Functional Programming HOWTO

Predicate factories are functions which create new predicates based on their arguments (e.g., _and, _nargs). Predicate partials are functions created by partial application of a predicate's arguments.

Complete project documentation is available. Project source is available at the github project page.

To install from PyPI:

$ pip install predicates

To install the development version from the github repository:

$ git clone https://github.com/agoraplex/predicates.git predicates
$ cd predicates
$ virtualenv-2.7 --no-site-packages venv
$ pip install -e '.[docs,tests]'

Use nosetests to run the test suite:

$ python setup.py nosetests

Use Sphinx to generate the HTML docs:

# to build in build/sphinx/html/...:
$ python setup.py build_sphinx

# to build in docs/_build/html/... (which is what I do):
$ make -C docs