code: def pixelPadding(self):
      # _penWidth is available after _updateColors()
      pw = (self._penWidth[1] or 1) * 0.5
      return pw
  
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 15 for calling the BarGraphItem obj's underlying member method code with example usage: obj.pixelPadding() and returns: pw