human
Solve the following python programming problem given the following code:
def _fill_cropping(self, image_size, view_size) : 
    '
        Return a (left, top, right, bottom) 4-tuple containing the cropping
        values required to display an image of *image_size* in *view_size*
        when stretched proportionately. Each value is a percentage expressed
        as a fraction of 1.0, e.g. 0.425 represents 42.5%. *image_size* and
        *view_size* are each (width, height) pairs.
        ' 
    def aspect_ratio(width, height) : 
        return (width / height) 
ar_view = aspect_ratio (* view_size) 
    ar_image = aspect_ratio (* image_size) 
    if (ar_view < ar_image) : 
        crop = ((1.0 - (crop / ar_image)) / 2.0) 
        return (crop, 0.0, crop, 0.0) 
if (ar_view > ar_image) : 
        crop = ((1.0 - (ar_image / ar_view)) / 2.0) 
        return (0.0, crop, 0.0, crop) 
return (0.0, 0.0, 0.0, 0.0) 

    
    

    Fix the buggy line: crop = ((1.0 - (crop / ar_image)) / 2.0)
assistant
#Here is Python program to fix the buggy line: crop = ((1.

crop = ((1.0 - (ar_view / ar_image)) / 2.0)