code: def set_transport(self, transport):
      assert self._transport is None, "Transport already set"
      self._transport = transport
  
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 6 for calling the StreamReader obj's underlying member method code with example usage: obj.set_transport(transport) without return types