docs: def get_cmap(self, arr=None, cmap=None, N=None):
          """Get the :class:`matplotlib.colors.Colormap` for plotting
  
          Parameters
          ----------
          arr: np.ndarray
              The array to plot
          cmap: str or matplotlib.colors.Colormap
              The colormap to use. If None, the :attr:`value` of this
              formatoption is used
          N: int
              The number of colors in the colormap. If None, the norm of the
              :attr:`bounds` formatoption is used and, if necessary, the
              given array `arr`
  
          Returns
          -------
          matplotlib.colors.Colormap
              The colormap returned by :func:`psy_simple.colors.get_cmap`"""
          N = N or None
          if cmap is None:
              cmap = self.value
          if N is None:
              try:
                  N = self.bounds.norm.Ncmap
              except AttributeError:
                  if arr is not None and self.bounds.norm is not None:
                      N = len(np.unique(self.bounds.norm(arr.ravel())))
          if N is not None:
              return get_cmap(cmap, N)
          return get_cmap(cmap)