old_contents: from __future__ import absolute_import
  from __future__ import print_function
  
  from typing import Any, Dict, Optional
  
  if False:
      import zerver.tornado.event_queue
  
  descriptors_by_handler_id = {} # type: Dict[int, zerver.tornado.event_queue.ClientDescriptor]
  
  def get_descriptor_by_handler_id(handler_id):
      # type: (int) -> zerver.tornado.event_queue.ClientDescriptor
      return descriptors_by_handler_id.get(handler_id)
  
  def set_descriptor_by_handler_id(handler_id, client_descriptor):
      # type: (int, zerver.tornado.event_queue.ClientDescriptor) -> None
      descriptors_by_handler_id[handler_id] = client_descriptor
  
  def clear_descriptor_by_handler_id(handler_id, client_descriptor):
      # type: (int, Optional[zerver.tornado.event_queue.ClientDescriptor]) -> None
      del descriptors_by_handler_id[handler_id]
  
new_contents: from __future__ import absolute_import
  from __future__ import print_function
  
  from typing import Any, Dict, Optional
  
  if False:
      import zerver.tornado.event_queue
  
  descriptors_by_handler_id = {}  # type: Dict[int, zerver.tornado.event_queue.ClientDescriptor]
  
  def get_descriptor_by_handler_id(handler_id):
      # type: (int) -> zerver.tornado.event_queue.ClientDescriptor
      return descriptors_by_handler_id.get(handler_id)
  
  def set_descriptor_by_handler_id(handler_id, client_descriptor):
      # type: (int, zerver.tornado.event_queue.ClientDescriptor) -> None
      descriptors_by_handler_id[handler_id] = client_descriptor
  
  def clear_descriptor_by_handler_id(handler_id, client_descriptor):
      # type: (int, Optional[zerver.tornado.event_queue.ClientDescriptor]) -> None
      del descriptors_by_handler_id[handler_id]
  
subject: Add compliance with rule E261 to descriptors.py.