docs: def process_whitelists():
      """Download approved top 1M lists."""
      import csv
      import grequests
      import os
      import StringIO
      import zipfile
      mapping = {
          'http://s3.amazonaws.com/alexa-static/top-1m.csv.zip': {
              'name': 'alexa.txt'
          }, 'http://s3-us-west-1.amazonaws.com/umbrella-static/top-1m.csv.zip': {
              'name': 'cisco.txt'
          }
      }
      rs = (grequests.get(u) for u in mapping.keys())
      responses = grequests.map(rs)
      for r in responses:
          data = zipfile.ZipFile(StringIO.StringIO(r.content)).read('top-1m.csv')
          stream = StringIO.StringIO(data)
          reader = csv.reader(stream, delimiter=',', quoting=csv.QUOTE_MINIMAL)
          items = [row[1].strip() for row in reader]
          stream.close()
  
          config_path = os.path.expanduser('~/.config/blockade')
          file_path = os.path.join(config_path, mapping[r.url]['name'])
          handle = open(file_path, 'w')
          for item in items:
              if item.count('.') == 0:
                  continue
              handle.write(item + "\n")
          handle.close()
      return True