old_contents: #!/usr/bin/env python
  import argparse
  import logging
  import sys
  from .styles import toggle_style
  
  parser = argparse.ArgumentParser(usage="%(prog)s [options] args...")
  
  def main(args):
      source = sys.stdin.read()
      return toggle_style(source)
      return 0
  
  
  def main_entry_point():
      args = parser.parse_args()
      sys.exit(main(args))
  
  
  if __name__ == "__main__":
      main_entry_point()
  
new_contents: #!/usr/bin/env python
  import argparse
  import logging
  import sys
  from .styles import toggle_style
  
  parser = argparse.ArgumentParser(usage="%(prog)s [options] args...")
  
  def main(args):
      source = sys.stdin.read()
      sys.stdout.write(toggle_style(source))
      return 0
  
  
  def main_entry_point():
      args = parser.parse_args()
      sys.exit(main(args))
  
  
  if __name__ == "__main__":
      main_entry_point()
  
subject: Fix main entry point