class_docstr: Subscribe to a Publish/Subscribe topic
  
  See Also
  --------
  Pub: for full docstring
code: def __repr__(self):
      return f"<Sub: {self.name}>"
  
imports: from __future__ import annotations
  import asyncio
  import logging
  import threading
  import weakref
  from collections import defaultdict, deque
  from dask.utils import parse_timedelta
  from distributed.core import CommClosedError
  from distributed.metrics import time
  from distributed.protocol.serialize import to_serialize
  from distributed.utils import TimeoutError, sync, wait_for
label_desc: Use image node_id 6 for calling the Sub obj's underlying member method code with example usage: obj.__repr__() and returns: str, self, str