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March 17, 2022 17:26
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Simple shredder for Opavote BLT format ranked choice ballots
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#!/usr/bin/env python3 | |
import sys | |
with open(sys.argv[1], 'r') as ballot_file: | |
lines = [line.rstrip() for line in ballot_file] | |
# Trim first header and final line | |
lines.pop(0) | |
lines.pop() | |
ballots = [] | |
options = [] | |
is_ballot = True | |
for x in lines: | |
if x == "0": | |
is_ballot = False | |
continue | |
if is_ballot: | |
ranking = x.split(" ") | |
first = ranking.pop(0) | |
if first != "1": | |
print("Expected first thing in ballot to be 1") | |
sys.exit() | |
last = ranking.pop() | |
if last != "0": | |
print("Expected last thing in ballot to be 0") | |
sys.exit() | |
ranking = [int(x) for x in ranking] | |
ballots.append(ranking) | |
else: | |
options.append(x) | |
def count_in_ballots(thing): | |
count = 0 | |
for b in ballots: | |
if thing in b: | |
count += 1 | |
return count | |
def count_first(thing): | |
count = 0 | |
for b in ballots: | |
if len(b) == 0: | |
continue | |
if thing == b[0]: | |
count += 1 | |
return count | |
for index, o in enumerate(options): | |
option_number = index + 1 | |
percentage_on_ballots = count_in_ballots(option_number) / len(ballots) * 100.0 | |
percentage_first_on_ballots = count_first(option_number) / len(ballots) * 100.0 | |
print(f"Option {option_number}: {o} had {percentage_on_ballots:.2f}% participation and was {percentage_first_on_ballots:.2f}% of voter's first choice") |
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