class_docstr: GraphicsItem filling the space between two PlotDataItems.
code: def __init__(self, curve1=None, curve2=None, brush=None, pen=None):
      QtWidgets.QGraphicsPathItem.__init__(self)
      self.curves = None
      if curve1 is not None and curve2 is not None:
          self.setCurves(curve1, curve2)
      elif curve1 is not None or curve2 is not None:
          raise Exception("Must specify two curves to fill between.")
  
      if brush is not None:
          self.setBrush(brush)
      self.setPen(pen)
      self.updatePath()
  
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 1 to create a new FillBetweenItem object from inherited base classes: QtWidgets with example: obj = FillBetweenItem(curve1, curve2, brush, pen)