222 lines
8.8 KiB
Python
222 lines
8.8 KiB
Python
# pyRCV2: Preferential vote counting
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# Copyright © 2020–2021 Lee Yingtong Li (RunasSudo)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import pyRCV2.blt
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import pyRCV2.numbers
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from pyRCV2.method.base_stv import EGSTVCounter
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from pyRCV2.model import CandidateState, CountCompleted
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def isclose(x, y):
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# There will be some discrepancy due to how the PRSA count rounds transfer values, so accept up to 0.1 votes difference
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return abs(int(x.impl) - y) < 100
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def test_prsa1():
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"""Compare count of prsa1.blt with model result at http://www.prsa.org.au/example1.pdf"""
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pyRCV2.numbers.set_numclass(pyRCV2.numbers.Fixed)
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pyRCV2.numbers.set_dps(5)
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with open('tests/data/prsa1.blt', 'r') as f:
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election = pyRCV2.blt.readBLT(f.read())
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assert len(election.candidates) == 7
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c_evans = next(c for c in election.candidates if c.name == 'Evans')
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c_grey = next(c for c in election.candidates if c.name == 'Grey')
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c_thomson = next(c for c in election.candidates if c.name == 'Thomson')
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c_ames = next(c for c in election.candidates if c.name == 'Ames')
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c_reid = next(c for c in election.candidates if c.name == 'Reid')
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c_spears = next(c for c in election.candidates if c.name == 'Spears')
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c_white = next(c for c in election.candidates if c.name == 'White')
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counter = EGSTVCounter(election, {
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'surplus_order': 'order',
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'papers': 'transferable',
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'exclusion': 'parcels_by_order',
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'round_quota': 0,
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})
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# Stage 1
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result = counter.reset()
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assert len(result.candidates.impl) == 7
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assert int(result.total.impl) == 65000
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assert int(result.quota.impl) == 13001
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assert result.comment == 'First preferences'
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assert isclose(result.candidates[c_evans].votes, 1000)
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assert isclose(result.candidates[c_grey].votes, 34000)
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assert isclose(result.candidates[c_thomson].votes, 5000)
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assert isclose(result.candidates[c_ames].votes, 10000)
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assert isclose(result.candidates[c_reid].votes, 1000)
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assert isclose(result.candidates[c_spears].votes, 11000)
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assert isclose(result.candidates[c_white].votes, 3000)
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assert isclose(result.exhausted.votes, 0)
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# Stage 2
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result = counter.step()
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assert result.comment == 'Surplus of Grey'
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assert isclose(result.candidates[c_evans].votes, 2234)
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assert isclose(result.candidates[c_grey].votes, 13001)
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assert isclose(result.candidates[c_thomson].votes, 7468)
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assert isclose(result.candidates[c_ames].votes, 18638)
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assert isclose(result.candidates[c_reid].votes, 1617)
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assert isclose(result.candidates[c_spears].votes, 17170)
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assert isclose(result.candidates[c_white].votes, 4851)
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assert isclose(result.exhausted.votes, 0)
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# Stage 3
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result = counter.step()
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assert result.comment == 'Surplus of Ames'
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assert isclose(result.candidates[c_evans].votes, 3038)
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assert isclose(result.candidates[c_grey].votes, 13001)
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assert isclose(result.candidates[c_thomson].votes, 8674)
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assert isclose(result.candidates[c_ames].votes, 13001)
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assert isclose(result.candidates[c_reid].votes, 2019)
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assert isclose(result.candidates[c_spears].votes, 17170)
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assert isclose(result.candidates[c_white].votes, 8067)
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assert isclose(result.exhausted.votes, 0)
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# Stage 4
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result = counter.step()
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assert result.comment == 'Surplus of Spears'
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assert isclose(result.candidates[c_evans].votes, 4823)
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assert isclose(result.candidates[c_grey].votes, 13001)
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assert isclose(result.candidates[c_thomson].votes, 8674)
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assert isclose(result.candidates[c_ames].votes, 13001)
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assert isclose(result.candidates[c_reid].votes, 3804)
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assert isclose(result.candidates[c_spears].votes, 13001)
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assert isclose(result.candidates[c_white].votes, 8662)
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assert isclose(result.exhausted.votes, 0)
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# Stage 5
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result = counter.step()
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assert result.comment == 'Exclusion of Reid'
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assert isclose(result.candidates[c_reid].transfers, -1000)
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assert isclose(result.candidates[c_white].transfers, 1000)
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# Stage 6
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result = counter.step()
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assert result.comment == 'Exclusion of Reid'
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assert isclose(result.candidates[c_reid].transfers, -617)
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assert isclose(result.candidates[c_white].transfers, 617)
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# Stage 7
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result = counter.step()
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assert result.comment == 'Exclusion of Reid'
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assert isclose(result.candidates[c_reid].transfers, -402)
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assert isclose(result.candidates[c_evans].transfers, 402)
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# Stage 8
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result = counter.step()
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assert result.comment == 'Exclusion of Reid'
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assert isclose(result.candidates[c_reid].transfers, -1785)
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assert isclose(result.candidates[c_evans].transfers, 595)
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assert isclose(result.candidates[c_thomson].transfers, 1190)
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assert isclose(result.candidates[c_evans].votes, 5820)
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assert isclose(result.candidates[c_grey].votes, 13001)
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assert isclose(result.candidates[c_thomson].votes, 9864)
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assert isclose(result.candidates[c_ames].votes, 13001)
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assert isclose(result.candidates[c_reid].votes, 0)
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assert isclose(result.candidates[c_spears].votes, 13001)
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assert isclose(result.candidates[c_white].votes, 10279)
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assert isclose(result.exhausted.votes, 0)
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# Stage 9
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result = counter.step()
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assert result.comment == 'Exclusion of Evans'
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assert isclose(result.candidates[c_evans].transfers, -1000)
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assert isclose(result.candidates[c_thomson].transfers, 1000)
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# Stage 10
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result = counter.step()
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assert result.comment == 'Exclusion of Evans'
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assert isclose(result.candidates[c_evans].transfers, -1234)
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assert isclose(result.exhausted.transfers, 1234)
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# Stage 11
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result = counter.step()
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assert result.comment == 'Exclusion of Evans'
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assert isclose(result.candidates[c_evans].transfers, -804)
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assert isclose(result.candidates[c_thomson].transfers, 402)
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assert isclose(result.candidates[c_white].transfers, 402)
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# Stage 12
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result = counter.step()
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assert result.comment == 'Exclusion of Evans'
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assert isclose(result.candidates[c_evans].transfers, -1785)
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assert isclose(result.candidates[c_white].transfers, 1190)
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assert isclose(result.exhausted.transfers, 595)
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# Stage 13
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result = counter.step()
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assert result.comment == 'Exclusion of Evans'
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assert isclose(result.candidates[c_evans].transfers, -402)
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assert isclose(result.candidates[c_thomson].transfers, 402)
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# Stage 14
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result = counter.step()
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assert result.comment == 'Exclusion of Evans'
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assert isclose(result.candidates[c_evans].transfers, -595)
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assert isclose(result.candidates[c_white].transfers, 595)
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assert isclose(result.candidates[c_evans].votes, 0)
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assert isclose(result.candidates[c_grey].votes, 13001)
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assert isclose(result.candidates[c_thomson].votes, 11668)
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assert isclose(result.candidates[c_ames].votes, 13001)
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assert isclose(result.candidates[c_reid].votes, 0)
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assert isclose(result.candidates[c_spears].votes, 13001)
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assert isclose(result.candidates[c_white].votes, 12466)
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assert isclose(result.exhausted.votes, 1829)
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# Stage 15
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result = counter.step()
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assert result.comment == 'Exclusion of Thomson'
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assert isclose(result.candidates[c_thomson].transfers, -5000)
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assert isclose(result.exhausted.transfers, 5000)
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# Stage 16
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result = counter.step()
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assert result.comment == 'Exclusion of Thomson'
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assert isclose(result.candidates[c_thomson].transfers, -2468)
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assert isclose(result.exhausted.transfers, 2468)
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# Stage 17
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result = counter.step()
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assert result.comment == 'Exclusion of Thomson'
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assert isclose(result.candidates[c_thomson].transfers, -1206)
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assert isclose(result.candidates[c_white].transfers, 1206)
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assert isclose(result.candidates[c_evans].votes, 0)
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assert isclose(result.candidates[c_grey].votes, 13001)
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assert isclose(result.candidates[c_thomson].votes, 2994)
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assert isclose(result.candidates[c_ames].votes, 13001)
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assert isclose(result.candidates[c_reid].votes, 0)
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assert isclose(result.candidates[c_spears].votes, 13001)
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assert isclose(result.candidates[c_white].votes, 13672)
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assert isclose(result.exhausted.votes, 9297)
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assert result.candidates[c_evans].state == CandidateState.EXCLUDED
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assert result.candidates[c_grey].state == CandidateState.ELECTED
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assert result.candidates[c_thomson].state == CandidateState.EXCLUDING
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assert result.candidates[c_ames].state == CandidateState.ELECTED
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assert result.candidates[c_reid].state == CandidateState.EXCLUDED
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assert result.candidates[c_spears].state == CandidateState.ELECTED
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assert result.candidates[c_white].state == CandidateState.PROVISIONALLY_ELECTED
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# Count complete
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result = counter.step()
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assert isinstance(result, CountCompleted)
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