code: def move_item(self, i, pos):
      if 0 <= i < len(self.m_items):
          item = self.m_items[i]
          item.setEnabled(False)
          item.setPos(pos)
          item.setEnabled(True)
      if self.is_rect:
          self.moveRect()
      else:
          self.moveLine(i)
  
imports: from qtpy import QtWidgets, QtGui, QtCore
  from .None import GripItem, LineItem, BBoxAnnotation
label_desc: Use image node_id 13 for calling the PolygonAnnotation obj's underlying member method code with example usage: obj.move_item(i, pos) without return types