code: def setSuffix(self, suffix):
      self._suffix = suffix
      # This may be called during widget construction in which case there is no
      # displayLabel yet
      if hasattr(self, "displayLabel"):
          self.updateDisplayLabel(self.slider.value())
  
file_path: pyqtgraph/pyqtgraph/parametertree/parameterTypes/slider.py
imports: import numpy
  from ...Qt import QtCore, QtWidgets
  from ..Parameter import Parameter
  from .basetypes import Emitter, WidgetParameterItem
label_desc: Use image node_id 3 for calling the SliderParameterItem obj's underlying member method code with example usage: obj.setSuffix(suffix) without return types