docstr: Return True if the buffer is empty and 'feed_eof' was called.
code: def at_eof(self):
      """Return True if the buffer is empty and 'feed_eof' was called."""
      return self._eof and not self._buffer
  
imports: import collections
  import socket
  import sys
  import warnings
  import weakref
  from .None import coroutines
  from .None import events
  from .None import exceptions
  from .None import format_helpers
  from .None import protocols
  from .log import logger
  from .tasks import sleep
label_desc: Use image node_id 9 for calling the StreamReader obj's underlying member method code with example usage: obj.at_eof() and returns: unknown