code: def del_channel(self, map=None):
      fd = self._fileno
      if map is None:
          map = self._map
      if fd in map:
          # self.log_info('closing channel %d:%s' % (fd, self))
          del map[fd]
      self._fileno = None
  
imports: import select
  import socket
  import sys
  import time
  import warnings
  import os
  from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, EINVAL, ENOTCONN, ESHUTDOWN, EISCONN, EBADF, ECONNABORTED, EPIPE, EAGAIN, errorcode
label_desc: Use image node_id 4 for calling the dispatcher obj's underlying member method code with example usage: obj.del_channel(map) without return types