How to use the mitogen.core.IOLOG.debug function in mitogen

def start_transmit(self, fd, data=None):
        mitogen.core._vv and IOLOG.debug('%r.start_transmit(%r, %r)',
            self, fd, data)
        self._wfds[fd] = (data or fd, self._generation)
        self._control(fd)

def _control(self, fd, filters, flags):
        mitogen.core._vv and IOLOG.debug(
            '%r._control(%r, %r, %r)', self, fd, filters, flags)
        # TODO: at shutdown it is currently possible for KQ_EV_ADD/KQ_EV_DEL
        # pairs to be pending after the associated file descriptor has already
        # been closed. Fixing this requires maintaining extra state, or perhaps
        # making fd closure the poller's responsibility. In the meantime,
        # simply apply changes immediately.
        # self._changelist.append(select.kevent(fd, filters, flags))
        changelist = [select.kevent(fd, filters, flags)]
        events, _ = mitogen.core.io_op(self._kqueue.control, changelist, 0, 0)
        assert not events

def start_receive(self, fd, data=None):
        mitogen.core._vv and IOLOG.debug('%r.start_receive(%r, %r)',
            self, fd, data)
        if fd not in self._rfds:
            self._control(fd, select.KQ_FILTER_READ, select.KQ_EV_ADD)
        self._rfds[fd] = (data or fd, self._generation)

def on_receive(self, broker):
        s = self.receive_side.read()
        IOLOG.debug('%r.on_receive() -> len %r', self, len(s))
        if s:
            mitogen.core.fire(self, 'receive', s)
        else:
            self.on_disconnect(broker)

def _control(self, fd):
        mitogen.core._vv and IOLOG.debug('%r._control(%r)', self, fd)
        mask = (((fd in self._rfds) and select.EPOLLIN) |
                ((fd in self._wfds) and select.EPOLLOUT))
        if mask:
            if fd in self._registered_fds:
                self._epoll.modify(fd, mask)
            else:
                self._epoll.register(fd, mask)
                self._registered_fds.add(fd)
        elif fd in self._registered_fds:
            self._epoll.unregister(fd)
            self._registered_fds.remove(fd)

changelist, 32, timeout)
        for event in events:
            fd = event.ident
            if event.flags & select.KQ_EV_ERROR:
                LOG.debug('ignoring stale event for fd %r: errno=%d: %s',
                          fd, event.data, errno.errorcode.get(event.data))
            elif event.filter == select.KQ_FILTER_READ:
                data, gen = self._rfds.get(fd, (None, None))
                # Events can still be read for an already-discarded fd.
                if gen and gen < self._generation:
                    mitogen.core._vv and IOLOG.debug('%r: POLLIN: %r', self, fd)
                    yield data
            elif event.filter == select.KQ_FILTER_WRITE and fd in self._wfds:
                data, gen = self._wfds.get(fd, (None, None))
                if gen and gen < self._generation:
                    mitogen.core._vv and IOLOG.debug('%r: POLLOUT: %r', self, fd)
                    yield data