old_contents: # This is the default config that ships with the Docker image with the
  # addition of the logic to save .html and .py versions of the notebooks
  
  from jupyter_core.paths import jupyter_data_dir
  from subprocess import check_call
  
  import subprocess
  import os
  import errno
  import stat
  
  PEM_FILE = os.path.join(jupyter_data_dir(), 'notebook.pem')
  
  c = get_config()
  c.NotebookApp.ip = '*'
  c.NotebookApp.port = 8888
  c.NotebookApp.open_browser = False
  
  # Set a certificate if USE_HTTPS is set to any value
  if 'USE_HTTPS' in os.environ:
      if not os.path.isfile(PEM_FILE):
          # Ensure PEM_FILE directory exists
          dir_name = os.path.dirname(PEM_FILE)
          try:
              os.makedirs(dir_name)
          except OSError as exc: # Python >2.5
              if exc.errno == errno.EEXIST and os.path.isdir(dir_name):
                  pass
              else: raise
          # Generate a certificate if one doesn't exist on disk
          subprocess.check_call(['openssl', 'req', '-new',
              '-newkey', 'rsa:2048', '-days', '365', '-nodes', '-x509',
              '-subj', '/C=XX/ST=XX/L=XX/O=generated/CN=generated',
              '-keyout', PEM_FILE, '-out', PEM_FILE])
          # Restrict access to PEM_FILE
          os.chmod(PEM_FILE, stat.S_IRUSR | stat.S_IWUSR)
      c.NotebookApp.certfile = PEM_FILE
  
  ### If you want to auto-save .html and .py versions of your notebook:
  # modified from: https://github.com/ipython/ipython/issues/8009
  def post_save(model, os_path, contents_manager):
      """post-save hook for converting notebooks to .py scripts"""
      if model['type'] != 'notebook':
          return # only do this for notebooks
      d, fname = os.path.split(os_path)
      check_call(['jupyter', 'nbconvert', '--to', 'script', fname], cwd=d)
      check_call(['jupyter', 'nbconvert', '--to', 'html', fname], cwd=d)
  c.FileContentsManager.post_save_hook = post_save
  
new_contents: # This is the default config that ships with the Docker image with the
  # addition of the logic to save .html and .py versions of the notebooks
  
  from jupyter_core.paths import jupyter_data_dir
  from subprocess import check_call
  
  import subprocess
  import os
  import errno
  import stat
  
  PEM_FILE = os.path.join(jupyter_data_dir(), 'notebook.pem')
  
  c = get_config()
  c.NotebookApp.ip = '*'
  c.NotebookApp.port = 8888
  c.NotebookApp.open_browser = False
  
  # Set a certificate if USE_HTTPS is set to any value
  if 'USE_HTTPS' in os.environ:
      if not os.path.isfile(PEM_FILE):
          # Ensure PEM_FILE directory exists
          dir_name = os.path.dirname(PEM_FILE)
          try:
              os.makedirs(dir_name)
          except OSError as exc: # Python >2.5
              if exc.errno == errno.EEXIST and os.path.isdir(dir_name):
                  pass
              else: raise
          # Generate a certificate if one doesn't exist on disk
          subprocess.check_call(['openssl', 'req', '-new',
              '-newkey', 'rsa:2048', '-days', '365', '-nodes', '-x509',
              '-subj', '/C=XX/ST=XX/L=XX/O=generated/CN=generated',
              '-keyout', PEM_FILE, '-out', PEM_FILE])
          # Restrict access to PEM_FILE
          os.chmod(PEM_FILE, stat.S_IRUSR | stat.S_IWUSR)
      c.NotebookApp.certfile = PEM_FILE
  
  # Disable authentication altogether, NOT RECOMMENDED FOR PRODUCTION ENVIRONMENTS
  c.NotebookApp.token = ''
  
  ### If you want to auto-save .html and .py versions of your notebook:
  # modified from: https://github.com/ipython/ipython/issues/8009
  def post_save(model, os_path, contents_manager):
      """post-save hook for converting notebooks to .py scripts"""
      if model['type'] != 'notebook':
          return # only do this for notebooks
      d, fname = os.path.split(os_path)
      check_call(['jupyter', 'nbconvert', '--to', 'script', fname], cwd=d)
      check_call(['jupyter', 'nbconvert', '--to', 'html', fname], cwd=d)
  c.FileContentsManager.post_save_hook = post_save
  
subject: Disable authentication altogether