human
Complete the below
def lum_contrast(clip, lum=0, contrast=0, contrast_thr=127):

    ''''luminosity-contrast correction of a clip'
    '''
assistant
#Here is the Python code you requested.
    def fl_image(im):
        im = (1.0 * im)
        corrected = ((im + lum) + (contrast * (im - float(contrast_thr))))
        corrected[(corrected < 0)] = 0
        corrected[(corrected > 255)] = 255
        return corrected.astype('uint8')
    return clip.fl_image(fl_image)