code: def shape(self):
      p = self._painterPathCache
      if p is None:
          self._painterPathCache = p = QtGui.QPainterPath()
          p.addRect(self.boundingRect())
      return p
  
file_path: pyqtgraph/pyqtgraph/graphicsItems/GraphicsWidget.py
imports: from ..Qt import QtCore, QtGui, QtWidgets
  from .GraphicsItem import GraphicsItem
label_desc: Use image node_id 8 for calling the GraphicsWidget obj's underlying member method code with example usage: obj.shape() and returns: p