def dump_vote(votes):
counts = Counter(tuple(v) for v in votes)
counts = list(counts.items())
counts.sort(key=lambda x: (-x[1], x[0]))
print("\\begin{itemize}")
for vote, n in counts:
grade = []
k = len(vote)
for i, c in enumerate(vote):
base = "%s as %d" % (name(i), c)
if i == k - 1:
base = "and " + base
grade.append(base)
grade = ', '.join(grade)
if n > 1:
print("\item %d voters grade %s" % (n, grade))
else:
print("\item 1 voter grades %s" % (grade, ))
print("\\end{itemize}")
if condorcet_winner(votes) != pl:
return False
return irv_winner(votes) != pl
except Ambiguous:
return False
if __name__ == '__main__':
from vbe.construction import find_election
print(find_election(irv_sucks))
import sys; sys.exit(0)
from vbe.construction import find_election
from vbe.output import output_election, name
result = find_election(key_irv_example, 4)
print("\n------------\n")
print(result)
print("\n------------\n")
output_election(result, 1)
print()
print("The Plurality winner is %s." % (name(plurality_winner(result)),))
print()
print("The IRV winner is %s." % (name(irv_winner(result)),))
print()
print("The Condorcet winner is %s." % (name(condorcet_winner(result)),))
a, b = candidates
if new_scores[a] == new_scores[b]:
raise Ambiguous()
return max((a, b), key=new_scores.__getitem__)
def is_not_two_round(votes):
try:
return supplementary_winner(votes) != simple_irv_winner(votes)
except Ambiguous:
return False
if __name__ == '__main__':
from vbe.output import output_election, name
from vbe.construction import find_election
result = find_election(is_not_two_round)
print("\n------------\n")
print(result)
print("\n------------\n")
output_election(result, 1)
print()
print("The Simple IRV winner is %s." % (name(simple_irv_winner(result)), ))
print()
print("The Supplementary winner is %s." %
(name(supplementary_winner(result)), ))
from vbe.output import output_votes, name, joined_list
result = non_condorcet_splitter
winner = list(stv(result, 1))[0]
house = sorted(stv(result, 2))
assert len(house) == 2
assert winner != condorcet_winner(non_condorcet_splitter)
print("\n------------\n")
print(result)
print("\n------------\n")
print("%d voters are choosing between %d candidates: %s." %
(len(result), len(result[0]), joined_list(sorted(result[0]))))
print()
output_votes(result)
print()
print(("The IRV winner is %s, but when electing two candidates "
"we elect %s and %s") %
(name(winner), name(house[0]), name(house[1])))
print()
print("Note that despite this the Condorcet winner is %s, not %s." %
(name(condorcet_winner(result)), name(winner)))
if n > 1:
print("\item %d voters grade %s" % (n, grade))
else:
print("\item 1 voter grades %s" % (grade, ))
print("\\end{itemize}")
if __name__ == '__main__':
print("The first one demonstrates all three approaches producing a "
"different result:")
dump_vote(all_results_distinct)
print(
("The Condorcet winner is %s, but the Majority Judgment winner is %s, "
"and the range winner is %s.") % (
name(condorcet_winner(all_results_distinct)),
name(mj_winner(all_results_distinct)),
name(range_winner(all_results_distinct)),
))
print("It's also possible for any two of them to coincide and disagree "
"with the third.")
print()
print("The following shows an example where majority jugment and range "
"voting agree on a candidate, but it's not the Condorcet winner.")
dump_vote(disagree_with_condorcet)
print(("The Condorcet winner is %s, but the Majority Judgment and range "
"winner is %s.") % (