Get preprocessing queue from a list of dictionaries

    >>> l = [{'RemoveDuplicateTime': None},
             {'ScaleAndShift': [{'center': True}]}
            ]
    >>> get_preprocessing_queue(l)
    [RemoveDuplicateTime, ScaleAndShift
     - center: True
     - max_width: 1
     - max_height: 1
    ]

def get_preprocessing_queue(preprocessing_list):
    """Get preprocessing queue from a list of dictionaries

    >>> l = [{'RemoveDuplicateTime': None},
             {'ScaleAndShift': [{'center': True}]}
            ]
    >>> get_preprocessing_queue(l)
    [RemoveDuplicateTime, ScaleAndShift
     - center: True
     - max_width: 1
     - max_height: 1
    ]
    """
    return utils.get_objectlist(preprocessing_list,
                                config_key='preprocessing',
                                module=sys.modules[__name__])