pyRCV2

pyRCV2 is an application for counting various preferential voting elections.

pyRCV2 may be used in a number of different ways:

• as an online web application, no installation or special software required, at https://yingtongli.me/rcv/
• as a standalone Python command line application
• as a library within another Python application

Features

pyRCV2 accepts data in the BLT file format, and can count votes using:

• weighted inclusive Gregory STV (e.g. Scottish STV)
• unweighted inclusive Gregory STV
• Wright STV

pyRCV2 is highly customisable, including options for:

• different quotas and quota rules (e.g. exact Droop, Hare) or progressively reducing quota
• calculations using fixed-point arithmetic or exact rational numbers
• different tie breaking rules (backwards, random, manual) with auditable deterministic random number generation
• extensible API for other counting methods