Mine

  def usernm():
    username = raw_input("User name: ")
    while True:
      if len(username) > 10:
         print ""
         print "Maximum chars per username is set to 10."
         print "Please enter again the username or type 99 to exit."
         print ""
      elif len(username) < 2:
         print ""
         print "Minimum chars per username is set to 2."
         print "Please enter again the username or type 99 to exit."
         print ""
      elif username == '99':
         print "Exiting."
              sys.exit(0)
      else:
         break
   print "Username Accepted"