code: def list_of_lists_to_dict(l):
      
      d = {}
      for key, val in l:
          d.setdefault(key, []).append(val)
      return d
docs: Convert list of key,value lists to dict
  
      [['id', 1], ['id', 2], ['id', 3], ['foo': 4]]
      {'id': [1, 2, 3], 'foo': [4]}