code: def main():
      '''Entry point'''
      if len(sys.argv) == 1:
          print("Usage: tyler [filename]")
          sys.exit(0)
      filename = sys.argv[1]
  
      if not os.path.isfile(filename):
          print("Specified file does not exists")
          sys.exit(8)
  
      my_tyler = Tyler(filename=filename)
      while True:
          try:
              for line in my_tyler:
                  print(line)
              time.sleep(1)
          except KeyboardInterrupt:
              print("Quit signal received")
              sys.exit(0f main():
      '''Entry point'''
      if len(sys.argv) == 1:
          print("Usage: tyler [filename]")
          sys.exit(0)
      filename = sys.argv[1]
  
      if not os.path.isfile(filename):
          print("Specified file does not exists")
          sys.exit(8)
  
      my_tyler = Tyler(filename=filename)
      while True:
          try:
              for line in my_tyler:
                  print(line)
              time.sleep(1)
          except KeyboardInterrupt:
              print("Quit signal received")
              sys.exit(0)
docs: Entry point