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siirtoaani.py
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siirtoaani.py
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from math import floor
import random
def stv(path=None,ballots=None,candidates=None,tie_breaking="backwards",):
if path:
ballots = {}
with open(path,"r",encoding="utf-8") as f:
for line in f:
values = line.replace("\n","").split(",")
voter = values[0]
votes = values[1:]
if voter != "":
ballots[voter] = votes
f.close()
results = {}
for voter in ballots:
candidate = ballots[voter][0]
if candidate in results:
results[candidate][0] += 1
else:
results[candidate] = [1]
# print(ballots)
eliminated = []
for voter in ballots:
rm = []
for v in ballots[voter]:
if v not in results:
rm.append(v)
if v not in eliminated:
eliminated.append(v)
[ballots[voter].remove(c) for c in rm]
# print(results)
# print()
[print(f"Candidate {e} didn't get any votes on the first round, and is eliminated.") for e in eliminated]
# print(ballots)
ready = False
i = 0
empty_ballots = []
while not ready:
i += 1
total_votes = len(ballots)
threshold = floor(total_votes/2) + 1
empty = len(empty_ballots)
print("- "*50)
print(f"Round {i}.")
print(f"Total: {total_votes}, empty ballots: {empty}, threshold: {threshold}.\n")
print(f"Votes now:")
[print(f"{V}: {results[V][-1]}") for V in results]
print()
# Winner determination
if len(results) == 2:
win_cand = []
for win in results:
win_cand.append(win)
cand_1_votes = results[win_cand[0]][-1]
cand_2_votes = results[win_cand[1]][-1]
# Tie-Breaking
if cand_1_votes == cand_2_votes:
print("Tie-breaking")
if tie_breaking == "random":
winner = random.choice(win_cand)
print(f"Coin toss between {win_cand}.")
ready = True
elif tie_breaking == "backwards":
toss = True
if i > 1:
[print(f"{w_c} votes: {results[w_c]}") for w_c in win_cand]
print()
for t in range(-2,-i-1,-1):
cand_1_votes = results[win_cand[0]][t]
cand_2_votes = results[win_cand[1]][t]
print("- "*25)
print(f"Round {i - (abs(t)-1)}")
[print(f"{w_c} votes: {results[w_c][t]}") for w_c in win_cand]
print()
if cand_1_votes > cand_2_votes:
winner = win_cand[0]
toss = False
break
elif cand_1_votes < cand_2_votes:
winner = win_cand[1]
toss = False
break
if toss:
print(f"Coin toss between {win_cand[0]} and {win_cand[1]}.")
winner = random.choice(win_cand)
elif tie_breaking == "forwards":
toss = True
if i > 1:
[print(f"{w_c} votes: {results[w_c]}")
for w_c in win_cand]
print()
for t in range(i-1):
cand_1_votes = results[win_cand[0]][t]
cand_2_votes = results[win_cand[1]][t]
print("- "*25)
print(f"Round {i}")
[print(f"{w_c} votes: {results[w_c][t]}")
for w_c in win_cand]
print()
if cand_1_votes > cand_2_votes:
winner = win_cand[0]
toss = False
break
elif cand_1_votes < cand_2_votes:
winner = win_cand[1]
toss = False
break
if toss:
print(
f"Coin toss between {win_cand[0]} and {win_cand[1]}.")
winner = random.choice(win_cand)
# Toisella enemmän
elif cand_1_votes > cand_2_votes:
winner = win_cand[0]
else:
winner = win_cand[1]
print(f"Winner is {winner} with {results[winner][-1]} votes.")
ready = True
if not ready:
low = []
for candidate in results:
c_votes = results[candidate][-1]
results[candidate].append(c_votes)
if c_votes >= threshold:
winner = candidate
print(f"Winner is {winner} with {results[winner][-1]} votes.")
ready = True
break
if not low:
low.append(candidate)
elif c_votes == results[low[0]][-1]:
low.append(candidate)
elif c_votes < results[low[0]][-1]:
low.clear()
low.append(candidate)
if len(low) == 1:
loser = low[0]
else:
print("Tie-breaking")
[print(f"{l_c} votes: {results[l_c]}") for l_c in low]
print()
if tie_breaking == "random":
loser = random.choice(low)
print(f"Coin toss between {low}.")
elif tie_breaking == "backwards":
low_tb = low
if i > 1:
l = low
for t in range(-3,-i-2,-1):
low_tb = []
for cand in l:
tb_votes = results[cand][t]
if not low_tb:
low_tb.append(cand)
elif tb_votes == results[low_tb[0]][t]:
low_tb.append(cand)
elif tb_votes < results[low_tb[0]][t]:
low_tb.clear()
low_tb.append(cand)
if len(l) != len(low_tb):
print(f"Difference found on round {i - (abs(t)-2)}")
[print(f"{cand} votes on round {i - (abs(t)-2)}: {results[cand][t]}") for cand in l]
l_s = ", ".join(low_tb)
print(f"Now low is: {l_s}\n")
if len(low_tb) == 1:
loser = low_tb[0]
break
else:
l = low_tb
if len(low_tb) > 1:
l_s = ", ".join(low_tb)
print(f"Coin toss between {l_s}.\n")
loser = random.choice(low_tb)
elif tie_breaking == "forwards":
low_tb = low
if i > 1:
l = low
for t in range(i-1):
low_tb = []
for cand in l:
tb_votes = results[cand][t]
if not low_tb:
low_tb.append(cand)
elif tb_votes == results[low_tb[0]][t]:
low_tb.append(cand)
elif tb_votes < results[low_tb[0]][t]:
low_tb.clear()
low_tb.append(cand)
if len(l) != len(low_tb):
print(f"Difference found on round {t+1}")
[print(f"{cand} votes on round {t+1}: {results[cand][t]}") for cand in l]
l_s = ", ".join(low_tb)
print(f"Now low is: {l_s}\n")
if len(low_tb) == 1:
loser = low_tb[0]
break
else:
l = low_tb
if len(low_tb) > 1:
l_s = ", ".join(low_tb)
print(f"Coin toss between {l_s}.\n")
loser = random.choice(low_tb)
print(f"Loser is {loser} with {results[loser][-1]} votes.")
results.pop(loser)
rm = []
for voter in ballots:
if loser in ballots[voter]:
if loser == ballots[voter][0] and len(ballots[voter]) > 1:
# print(f"{voter} voted for {ballots[voter][0]}.")
# print(f"Whole ballot: {ballots[voter]}")
results[ballots[voter][1]][-1] += 1
# print(f"Now the vote goes to {ballots[voter][1]}.")
# print(f"Removing {loser} from {voter}'s ballot.")
ballots[voter].remove(loser)
# print(f"Ballot after: {ballots[voter]}")
if len(ballots[voter]) == 0:
# print(f"{voter}'s ballot is now empty.")
empty_ballots.append(voter)
rm.append(voter)
# print()
[ballots.pop(v) for v in rm]
print("- "*50,"\n")