class_docstr: GraphicsItem filling the space between two PlotDataItems.
code: def setPen(self, *args, **kwds):
      QtWidgets.QGraphicsPathItem.setPen(self, fn.mkPen(*args, **kwds))
  
file_path: pyqtgraph/pyqtgraph/graphicsItems/FillBetweenItem.py
imports: from ..None import functions
  from ..Qt import QtGui, QtWidgets
  from .PlotCurveItem import PlotCurveItem
  from .PlotDataItem import PlotDataItem
label_desc: Use image node_id 3 for calling the FillBetweenItem obj's underlying member method code with example usage: obj.setPen() without return types