'Make a reversed instance of the Colormap.
Parameters
name : str, optional
The name for the reversed colormap. If it\'s None the
name will be the name of the parent colormap + "_r".
Returns
ListedColormap
A reversed instance of the colormap.'

def reversed(self, name=None):

    if (name is None):
        name = (self.name + u'_r')
    colors_r = list(reversed(self.colors))
    return ListedColormap(colors_r, name=name, N=self.N)
