code: def shape(self):
      if self._shape is None:
          shape = QtGui.QPainterPath()
          rects = self._rectarray.instances()
          for rect in rects:
              shape.addRect(rect)
          self._shape = shape
      return self._shape
  
imports: import numpy
  from ..None import functions
  from ..None import getConfigOption
  from ..None import Qt
  from ..Qt import QtCore, QtGui
  from .GraphicsObject import GraphicsObject
label_desc: Use image node_id 10 for calling the BarGraphItem obj's underlying member method code with example usage: obj.shape() and returns: self