monad - a functional python package¶
Introduction¶
What?¶
Monads in python, with some helpful functions.
How?¶
>>> from monad.decorators import maybe
>>> parse_int = maybe(int)
>>> parse_int(42)
Just(42)
>>> parse_int('42')
Just(42)
>>> parse_int('42.2')
Nothing
>>> parse_float = maybe(float)
>>> parse_float('42.2')
Just(42.2)
>>> from monad.actions import tryout
>>> parse_number = tryout(parse_int, parse_float)
>>> tokens = [2, '0', '4', 'eight', '10.0']
>>> [parse_number(token) for token in tokens]
[Just(2), Just(0), Just(4), Nothing, Just(10.0)]
>>> @maybe
... def reciprocal(n):
... return 1. / n
>>> reciprocal(2)
Just(0.5)
>>> reciprocal(0)
Nothing
>>> process = parse_number >> reciprocal
>>> process('4')
Just(0.25)
>>> process('0')
Nothing
>>> [process(token) for token in tokens]
[Just(0.5), Nothing, Just(0.25), Nothing, Just(0.1)]
>>> [parse_number(token) >> reciprocal for token in tokens]
[Just(0.5), Nothing, Just(0.25), Nothing, Just(0.1)]
>>> [parse_number(token) >> reciprocal >> reciprocal for token in tokens]
[Just(2.0), Nothing, Just(4.0), Nothing, Just(10.0)]
Why?¶
Why not.
Requirements¶
- CPython >= 2.7
Installation¶
Install from PyPI:
pip install monad
Install from source, download source package, decompress, then cd
into source directory, run:
make install
License¶
BSD New, see LICENSE for details.
Links¶
- Documentation:
- http://monad.readthedocs.org/
- Issue Tracker:
- https://bitbucket.org/pyx/monad/issues/
- Source Package @ PyPI:
- https://pypi.python.org/pypi/monad/
- Mercurial Repository @ bitbucket:
- https://bitbucket.org/pyx/monad/
- Git Repository @ Github:
- https://github.com/pyx/monad/