def list_of_groups(init_list, children_list_len):
  list_of_groups = zip(*(iter(init_list),) *children_list_len)
  end_list = [list(i) for i in list_of_groups]
  count = len(init_list) % children_list_len
  end_list.append(init_list[-count:]) if count !=0 else end_list
  return end_list

import split_list
 
code_list = ['300033','600066','300032','600065','300031','600064']
 
code_list = split_list.list_of_groups(code_list,3)