old_contents: #! /usr/bin/python
  
  from __future__ import absolute_import
  
  import argparse
  import string
  
  try:
      from string import letters as ascii_letters
  except ImportError:
      from string import ascii_letters
  
  import random
  
  
  def print_random_chars(chars=1000, selection=ascii_letters + string.digits):
      s = []
      for _ in range(chars - 1):
          s.append(random.choice(selection))
      s.append('@')
      print(''.join(s))
  
  
  def main():
      parser = argparse.ArgumentParser()
      parser.add_argument('--chars', type=int, metavar='N', default=10)
      args = parser.parse_args()
      print_random_chars(args.chars)
  
  
  if __name__ == '__main__':
      main()
  
new_contents: #!/usr/bin/env python
  
  from __future__ import absolute_import
  
  import argparse
  import string
  
  try:
      from string import letters as ascii_letters
  except ImportError:
      from string import ascii_letters
  
  import random
  
  
  def print_random_chars(chars=1000, selection=ascii_letters + string.digits):
      s = []
      for _ in range(chars - 1):
          s.append(random.choice(selection))
      s.append('@')
      print(''.join(s))
  
  
  def main():
      parser = argparse.ArgumentParser()
      parser.add_argument('--chars', type=int, metavar='N', default=10)
      args = parser.parse_args()
      print_random_chars(args.chars)
  
  
  if __name__ == '__main__':
      main()
  
subject: Test a change.