code: def prettyTextValue(self, v):
      if self._suffix is None:
          suffixTxt = ""
      else:
          suffixTxt = f" {self._suffix}"
      format_ = self.param.opts.get("format", None)
      cspan = self.charSpan
      if format_ is None:
          format_ = f"{{0:>{cspan.dtype.itemsize}}}{suffixTxt}"
      return format_.format(cspan[v].decode())
  
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 6 for calling the SliderParameterItem obj's underlying member method code with example usage: obj.prettyTextValue(v) and returns: format_