2018 台北市長選舉推測票數（依各區票倉的票所數 已送/應送 比例乘上去來推測）

gistfile1.rb

require 'httparty'

class ApiService
  include HTTParty
  base_uri 'http://vote.2018.nat.gov.tw/mobile/zh_TW/TC'

  def load(code)
    response = self.class.get("/#{code}.html").parsed_response
    
    response =~ /已送\/應送: (\d+)\/(\d+)/
    ratio = $1.to_f / $2.to_f
    
    result = response.scan(/<td>(.*?)<\/td>\n        <td>.<\/td>\n        <td class=\"numeric\">((?:\d|,)+)<\/td>/).to_a

    return result.map do |name, number|
      number = number.gsub(',', '').to_i
      next [name, [number, number * 1 / ratio.to_f]]
    end.to_h
  end
end

def get_result
  api = ApiService.new
  predict_hash = Hash.new(0)
  real_hash = Hash.new(0)
  { 
    '松山區' => '63000000100000000',
    '信義區' => '63000000200000000',
    '大安區' => '63000000300000000',
    '中山區' => '63000000400000000',
    '中正區' => '63000000500000000',
    '大同區' => '63000000600000000',
    '萬華區' => '63000000700000000',
    '文山區' => '63000000800000000',
    '南港區' => '63000000900000000',
    '內湖區' => '63000001000000000',
    '士林區' => '63000001100000000',
    '北投區' => '63000001200000000',
  }.each do |key, code|
    api.load(code).each do |name, (real_number, predict_number)|
      predict_hash[name] += predict_number
      real_hash[name] += real_number
    end
  end
  return [predict_hash, real_hash]
end

loop do
  predict_hash, real_hash = get_result

  puts '---------------------------------------'
  p Time.now
  
  predict_sum = predict_hash.values.sum
  real_sum = real_hash.values.sum
  ratio = real_sum / predict_sum.to_f
  
  puts "\n - 實際票數 (已開 #{(ratio * 100).round(2)}%)"
  real_hash.each do |name, number| 
    puts "%s %8d (%5.2f%%)" % [name, number.round, (number.round * 100.0 / real_sum).round(2)]
  end
  
  puts "\n - 預測票數"
  predict_hash.each do |name, number| 
    puts "%s %8d (%5.2f%%)" % [name, number.round, (number.round * 100.0 / predict_sum).round(2)]
  end

  sleep 30
 end