DouKaku?

# encoding: utf-8

sample = u"ゆめよりもはかなき世のなかをなげきわびつゝあかしくらすほどに四月十よひにもなりぬれば木のしたくらがりもてゆく"

def divid(str, n, target_list=[]):
  def get_splitted_str(str, n):
    return str[:len(str[::n])]

  if str:
    s = get_splitted_str(str, n)
    return divid(str[len(s):], n-1, target_list+[s])
  else: return target_list

for i in range(4,7):
  print "divid", i
  l = divid(sample, i)
  for line in l:
    print line
  print ""