docs: def _get_cmaps(names):
      """Filter the given `names` for colormaps"""
      import matplotlib.pyplot as plt
      available_cmaps = list(
          chain(plt.cm.cmap_d, _cmapnames, rcParams['colors.cmaps']))
      names = list(names)
      wrongs = []
      for arg in (arg for arg in names if (not isinstance(arg, Colormap) and
                                           arg not in available_cmaps)):
          if isinstance(arg, str):
              similarkeys = get_close_matches(arg, available_cmaps)
          if similarkeys != []:
              warn("Colormap %s not found in standard colormaps.\n"
                   "Similar colormaps are %s." % (arg, ', '.join(similarkeys)))
          else:
              warn("Colormap %s not found in standard colormaps.\n"
                   "Run function without arguments to see all colormaps" % arg)
          names.remove(arg)
          wrongs.append(arg)
      if not names and not wrongs:
          names = sorted(m for m in available_cmaps if not m.endswith("_r"))
      return names