old_contents: def lookandsay(line):
      p = None
      n = 0
      result = []
      for c in line:
          if n > 0 and p is not c:
              result.append(str(n))
              result.append(p)
              n = 0
  
          p = c
          n += 1
  
      result.append(str(n))
      result.append(p)
  
      return ''.join(result)
  
  
  line = "1321131112"
  for x in range(40):
      line = lookandsay(line)
  
  print "40:", len(line)
  
  for x in range(10):
      line = lookandsay(line)
  
  print "50:", len(line)
  
new_contents: import itertools
  
  def lookandsay(line):
      return ''.join([str(len(list(it))) + c for c, it in itertools.groupby(line)])
  
  
  line = "1321131112"
  for x in range(40):
      line = lookandsay(line)
  
  print "40:", len(line)
  
  for x in range(10):
      line = lookandsay(line)
  
  print "50:", len(line)
  
subject: Reimplement day 10 using itertools combine.