python-vote-core 20120423.0

An implementation of various election methods, most notably the Schulze Method and Schulze STV.

python-vote-core implements various electoral methods, providing the results calculated off a provided set of ballots and options.

• Project page: http://github.com/bradbeattie/python-vote-core

• Issue tracker: http://github.com/bradbeattie/python-vote-core/issues

• Example usage: http://vote.cognitivesandbox.com, http://modernballots.com

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:

print SchulzeMethod([
  { "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"]] }
], ballot_notation = "grouping").as_dict()

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.