text: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import datetime
  
  def round6():
      for i in range(0,10):
          for j in range(0,10):
              for k in range(0,10):
                  for l in range(0,10):
                              mkdir(i,j,k,l)
  
  
  def mkdir(i,j,k,l):  
      path = "C:/Users/peng/Documents/buildup/" + str(i) + "/" + str(j) + "/" + str(k) + "/" + str(l)
      os.makedirs( path )
      tmp_file = open(path+"/tmp.txt","w",encoding='utf-8')
      tmp_file.write("hello world")
      tmp_file.close()
  
  if __name__ == '__main__':
      start = datetime.datetime.now()
      round6()
      end = datetime.datetime.now()
      print("Time used:",end - start)
  