def easy_invert(self, image, num_viz=0):
    'Wraps functions `preprocess()` and `invert()` together.'
    return self.invert(self.preprocess(image), num_viz)
Wraps functions `preprocess()` and `invert()` together.
def easy_invert(self, image, num_viz=0):
    
    return self.invert(self.preprocess(image), num_viz)