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,
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]'
Note
Pay particular attention to that pip install line. That's a period, followed by [docs,tests]
1 (and it's in single-quotes to keep bash from misunderstanding the square brackets).
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
Yes, it's a hack. See the python setup.py develop and extras thread on the python-distutils-sig mailing list).↩