python3-vote-core 20170329.0

Description:

python3votecore 20170329.0

python-vote-core implements various electoral methods, providing the
results calculated off a provided set of ballots and options. This
fork implements only Python3 compatibility!

Project page: http://github.com/the-maldridge/python-vote-core
Issue tracker: http://github.com/the-maldridge/python-vote-core/issues


Python3
This fork implements Python3 functionality by using 2to3 and then
cherry-picking fixes from other people’s forks. This is certainly not
a clean way to do so but 100% of the tests pass on Python3.
This fork exists solely to have a PyPI release under Python3.


Methods implemented

Single Winner Methods

Plurality (aka first-past-the-post or fptp)
Instant-Runoff Voting (aka IRV)
Schulze Method (aka Beatpath)


Multiple Winner Methods

Plurality at large (aka block voting)
Single Transferable Vote (aka STV)
Schulze STV


Ordering Methods

Schulze Proportional Representation
Schulze Nonproportional Representation





Basic Usage
Schulze method example:
>>> from pyvotecore.schulze_method import SchulzeMethod
>>> from pyvotecore.condorcet import CondorcetHelper
>>> ballots = [
... { "count":3, "ballot":[["A"], ["C"], ["D"], ["B"]] },
... { "count":9, "ballot":[["B"], ["A"], ["C"], ["D"]] },
... { "count":8, "ballot":[["C"], ["D"], ["A"], ["B"]] },
... { "count":5, "ballot":[["D"], ["A"], ["B"], ["C"]] },
... { "count":5, "ballot":[["D"], ["B"], ["C"], ["A"]] }
... ]
>>> SchulzeMethod(ballots, ballot_notation = CondorcetHelper.BALLOT_NOTATION_GROUPING).as_dict()
{'actions': [{'edges': {('A', 'B')}},
{'edges': {('A', 'C')}},
{'nodes': {'A'}},
{'edges': {('B', 'C')}},
{'nodes': {'B', 'D'}}],
'candidates': {'A', 'B', 'C', 'D'},
'pairs': {('A', 'B'): 16,
('A', 'C'): 17,
('A', 'D'): 12,
('B', 'A'): 14,
('B', 'C'): 19,
('B', 'D'): 9,
('C', 'A'): 13,
('C', 'B'): 11,
('C', 'D'): 20,
('D', 'A'): 18,
('D', 'B'): 21,
('D', 'C'): 10},
'strong_pairs': {('A', 'B'): 16,
('A', 'C'): 17,
('B', 'C'): 19,
('C', 'D'): 20,
('D', 'A'): 18,
('D', 'B'): 21},
'winner': 'C'}
20110509.1
—

Fixing PyPi release

20110509.0
—

Initial PyPi release



License
Copyright (C) 2009, Brad Beattie
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses.