__init__.py 文件源码

def __del__(self):
        # This MotorCursor is deleted on whatever greenlet does the last
        # decref, or (if it's referenced from a cycle) whichever is current
        # when the GC kicks in. We may need to send the server a killCursors
        # message, but in Motor only direct children of the main greenlet can
        # do I/O. First, do a quick check whether the cursor is still alive on
        # the server:
        if self.cursor_id and self.alive:
            if greenlet.getcurrent().parent is not None:
                # We're on a child greenlet, send the message.
                self.delegate.close()
            else:
                # We're on the main greenlet, start the operation on a child.
                self.close()

    # Paper over some differences between PyMongo Cursor and CommandCursor.