def test_no_ties_allowed(self):
self.longMessage = True
votes = [11, 11, 11]
seats = 4
for method in app.METHODS:
with self.assertRaises(app.TiesException,
msg=method + " failed"):
app.compute(method, votes, seats,
tiesallowed=False, verbose=False)
def test_saintelague_difference(self):
votes = [6, 1]
seats = 4
r1 = app.compute("saintelague", votes,
seats, verbose=False) # [3, 1]
r2 = app.compute("modified_saintelague", votes,
seats, verbose=False) # [4, 0]
self.assertNotEqual(r1, r2,
"Sainte Lague and its modified variant"
+ "should produce different results.")
def test_no_ties_allowed2(self):
self.longMessage = True
votes = [12, 12, 11, 12]
seats = 3
for method in app.METHODS:
self.assertEqual(
app.compute(method, votes, seats,
tiesallowed=False, verbose=False),
[1, 1, 0, 1], msg=method + " failed")
def test_fewerseatsthanparties(self):
self.longMessage = True
votes = [10, 9, 8, 8, 11, 12]
seats = 3
for method in app.METHODS:
result = app.compute(method, votes,
seats, verbose=False)
self.assertEqual(result, [1, 0, 0, 0, 1, 1],
msg=method + " failed")
def test_zero_parties(self):
self.longMessage = True
votes = [0, 14, 28, 0, 0]
seats = 6
for method in app.METHODS:
result = app.compute(method, votes,
seats, verbose=False)
self.assertEqual(result, [0, 2, 4, 0, 0],
msg=method + " failed")
def test_weak_proportionality(self):
self.longMessage = True
votes = [14, 28, 7, 35]
seats = 12
for method in app.METHODS:
result = app.compute(method, votes,
seats, verbose=False)
self.assertEqual(result, [2, 4, 1, 5],
msg=method + " failed")
def test_tiebreaking(self):
self.longMessage = True
votes = [2, 1, 1, 2, 2]
seats = 2
for method in app.METHODS:
result = app.compute(method, votes,
seats, verbose=False)
self.assertEqual(result, [1, 0, 0, 1, 0],
msg=method + " failed")
def test_threshold(self):
votes = [41, 56, 3]
seats = 60
threshold = 0.03
filtered_votes = app.apply_threshold(votes, threshold)
self.assertEqual(filtered_votes, [41, 56, 3],
"Threshold cut too much.")
threshold = 0.031
filtered_votes = app.apply_threshold(votes, threshold)
self.assertEqual(filtered_votes, [41, 56, 0],
"Threshold was not applied correctly.")
method = "dhondt"
threshold = 0
unfiltered_result = app.compute(method, votes, seats,
threshold=threshold,
verbose=False)
threshold = 0.04
filtered_result = app.compute(method, votes, seats,
threshold=threshold,
verbose=False)
self.assertNotEqual(unfiltered_result, filtered_result,
"Result did not change despite threshold")
def test_all_implemented(self):
ALLMETHODSSTRINGS = ["quota", "lrm", "hamilton", "largest_remainder",
"dhondt", "jefferson", "saintelague", "webster",
"huntington", "hill", "adams", "dean",
"smallestdivisor", "harmonicmean",
"equalproportions", "majorfractions",
"greatestdivisors", "modified_saintelague"]
votes = [1]
seats = 1
for method in ALLMETHODSSTRINGS:
result = app.compute(method, votes,
seats, verbose=False)
self.assertEqual(result, [1],
msg=method + " does not exist")
def test_balinski_young_example2(self):
self.longMessage = True
RESULTS = {"quota": [10, 7, 5, 3, 1],
"largest_remainder": [9, 7, 5, 4, 1],
"dhondt": [10, 7, 5, 3, 1],
"saintelague": [9, 8, 5, 3, 1],
"modified_saintelague": [9, 8, 5, 3, 1],
"huntington": [9, 7, 6, 3, 1],
"adams": [9, 7, 5, 3, 2],
"dean": [9, 7, 5, 4, 1]
}
votes = [9061, 7179, 5259, 3319, 1182]
seats = 26
for method in RESULTS.keys():
result = app.compute(method, votes,
seats, verbose=False)
self.assertEqual(result, RESULTS[method],
msg=method + " failed")
def test_balinski_young_example1(self):
self.longMessage = True
RESULTS = {"quota": [52, 44, 2, 1, 1],
"largest_remainder": [51, 44, 2, 2, 1],
"dhondt": [52, 45, 1, 1, 1],
"saintelague": [51, 43, 2, 2, 2],
"modified_saintelague": [51, 43, 2, 2, 2],
"huntington": [51, 43, 2, 2, 2],
"adams": [51, 43, 2, 2, 2],
"dean": [51, 43, 2, 2, 2]
}
votes = [5117, 4400, 162, 161, 160]
seats = 100
for method in RESULTS.keys():
result = app.compute(method, votes,
seats, verbose=False)
self.assertEqual(result, RESULTS[method],
msg=method + " failed")
parties = 5
seats = 20
methods = ["quota", "largest_remainder", "dhondt", "saintelague", "adams"]
iterator = combinations(range(1, maxvoters + 1), parties)
for iterations, votes in enumerate(iterator):
apportionments = set()
for method in methods:
try: # in case of ties an exception occurs because tiesallowed=False
apportionments.add(
tuple(
app.compute(method,
votes,
seats,
tiesallowed=False,
verbose=False)))
except Exception:
pass
if len(apportionments) == len(methods):
break
else:
print("No vote distribution found within the parameter range.")
quit()
print("votes = {}".format(votes))
print("found in {} iterations\n\n".format(iterations))
for method in methods:
from __future__ import print_function
import apportionment.methods as app
print("Parties with surplus-vote agreements are treated as coalitions")
print("See https://www.knesset.gov.il/lexicon/eng/seats_eng.htm\n")
with open("knesset.txt", "r") as f:
for line in f:
knesset_nr, partynames, votes, officialresult, threshold = \
eval(line)
print("Knesset #" + str(knesset_nr) + ":")
result = app.compute("dhondt",
votes,
sum(officialresult),
parties=partynames,
threshold=threshold,
verbose=True)
# actual results
print("Identical with official result: " +
(str(tuple(result) == tuple(officialresult))) + "\n\n")
from __future__ import print_function
import apportionment.methods as app
votes = [1, 3, 6, 7, 78]
seats = 20
print("votes", "." * (25 - len("votes")), votes, "\n")
print(seats, "seats", "\n")
print("apportionment results:")
for method in [
"quota", "largest_remainder", "dhondt", "saintelague", "huntington",
"adams", "dean"
]:
result = app.compute(method, votes, seats, verbose=False)
print(method, "." * (25 - len(method)), result)
from __future__ import print_function
import apportionment.methods as app
with open("./nr_wahlen.txt", "r") as f:
for line in f:
year, partynames, votes, officialresult = eval(line)
print(year)
result = app.compute("dhondt",
votes,
183,
parties=partynames,
threshold=.04,
verbose=True)
# actual results
print("Identical with official result: " +
(str(tuple(result) == tuple(officialresult))) + "\n\n")
