divide list ['a', 'b', 'c', '1', '2', '3'] evenly into three separate list

def list_divider(list):
  list_len = len(list)
  list_len_divided_by_three = list_len/3
  return [list[0:list_len_divided_by_three], list[list_len_divided_by_three:list_len_divided_by_three * 2], list[list_len_divided_by_three * 2:list_len]]

list_divider(['a', 'b', 'c', '1', '2', '3'])