old_contents: import datetime
  import mimetypes
  from functools import lru_cache
  from typing import Dict, List, Union
  
  import pkg_resources
  import simplejson
  
  from etl.json_encoder import FancyJsonEncoder
  
  
  class Content:
      def __init__(self, name: str = None, json: Union[List, Dict] = None) -> None:
          if name is not None:
              self.content = pkg_resources.resource_string(__name__, name)
              self.content_type, self.content_encoding = mimetypes.guess_type(name)
              self.cache_control = None
          elif json is not None:
              json_text = simplejson.dumps(json, sort_keys=True, cls=FancyJsonEncoder)
              self.content = (json_text + "\n").encode("utf-8")
              self.content_type, self.content_encoding = "application/json", "UTF-8"
              self.cache_control = "no-cache, no-store, must-revalidate"
          self.content_length = len(self.content)
          self.last_modified = datetime.datetime.now(datetime.timezone.utc).strftime("%a, %d %b %Y %H:%M:%S %Z")
  
  
  def asset_exists(name: str) -> bool:
      """
      Return True only if the desired asset is known to exist.
      """
      if name:
          return pkg_resources.resource_exists(__name__, name)
      else:
          return False  # don't allow access to directory
  
  
  @lru_cache()
  def get_asset(name: str) -> Content:
      """
      Return asset along with content type and length.
      If asset does not exist, simply return None.
      """
      return Content(name=name)
  
new_contents: import datetime
  import mimetypes
  from functools import lru_cache
  from typing import Dict, List, Union
  
  import pkg_resources
  import simplejson
  
  from etl.json_encoder import FancyJsonEncoder
  
  
  class Content:
      def __init__(self, name: str = None, json: Union[List, Dict] = None) -> None:
          if name is not None:
              self.content = pkg_resources.resource_string(__name__, name)
              self.content_type, self.content_encoding = mimetypes.guess_type(name)
              self.cache_control = None
          elif json is not None:
              json_text = simplejson.dumps(json, sort_keys=True, cls=FancyJsonEncoder)
              self.content = (json_text + "\n").encode("utf-8")
              self.content_type, self.content_encoding = "application/json", "UTF-8"
              self.cache_control = "no-cache, no-store, must-revalidate"
          self.content_length = len(self.content)
          self.last_modified = datetime.datetime.now(datetime.timezone.utc).strftime("%a, %d %b %Y %H:%M:%S %Z")
  
  
  def asset_exists(name: str) -> bool:
      """Return True only if the desired asset is known to exist."""
      if name:
          return pkg_resources.resource_exists(__name__, name)
      else:
          return False  # don't allow access to directory
  
  
  @lru_cache()
  def get_asset(name: str) -> Content:
      """
      Return asset along with content type and length.
  
      If asset does not exist, simply return None.
      """
      return Content(name=name)
  
subject: Fix comments in python/etl/assets