new_contents: import json, sys, re
  colors = {'PRO': ["#0f8c79", "#074a3f"], 'ANTI': ['#bd2d28', '#5e1614'], '???': ['#978F80', '#5B564D']}
  j = json.load(open(sys.argv[1]))
  
  # count
  from collections import Counter
  from colour import Color
  
  pa_count = Counter()
  for item in j:
      pa_count[item['pro_anti']] += 1
  
  for pa, count in pa_count.items():
      if count > len(colors[pa]):
          colors[pa] = [str(c) for c in Color(colors[pa][0]).range_to(Color(colors[pa][1]), count)]
  
  transform_id = lambda i: re.sub(r'[^a-z0-9_-]', '', re.sub(r'\s+', '_', i.lower()))
  
  for item in j:
      item['color'] = colors[item['pro_anti']].pop(0)
      item['id'] = transform_id(item['id'])
      item['pro_anti']
  print json.dumps(j, indent=4)
  
subject: Add code for colorizing the pro/anti bubbles.