code: def buildMatplotlibSubMenu(self):
      source = "matplotlib"
      names = colormap.listMaps(source=source)
      # remove entries registered by colorcet
      names = [x for x in names if not x.startswith("cet_")]
      # remove the reversed colormaps
      names = [x for x in names if not x.endswith("_r")]
      self.buildSubMenu(names, source)
  
imports: import importlib.util
  import re
  import numpy
  from ..None import colormap
  from ..None import functions
  from ..graphicsItems.GradientPresets import Gradients
  from ..Qt import QtCore, QtGui, QtWidgets
label_desc: Use image node_id 6 for calling the ColorMapMenu obj's underlying member method code with example usage: obj.buildMatplotlibSubMenu() without return types