Python Vote Core

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()