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]'
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
| [1] | Yes, it's a hack. See the python setup.py develop and extras thread on the python-distutils-sig mailing list). |