new_contents: from string import uppercase, lowercase, maketrans
  
  def rot_alpha(data, rot):
  
  	upper = ''.join([uppercase[(i+rot)%26] for i in xrange(26)])
  	lower = ''.join([lowercase[(i+rot)%26] for i in xrange(26)])
  	table = maketrans(uppercase + lowercase, upper + lower)
  
  	return data.translate(table)
  
subject: Create rot_alpha.py