

@classmethod
def _match(cls, el, spec):
    'Return the strength of the match (None if no match)'
    spec_dict = dict(zip(['type', 'group', 'label'], spec.split('.')))
    if ((not isinstance(el, Image)) or (spec_dict['type'] != 'Image')):
        raise NotImplementedError('Only Image currently supported')
    sanitizers = {
        'group': group_sanitizer,
        'label': label_sanitizer,
    }
    strength = 1
    for key in ['group', 'label']:
        attr_value = sanitizers[key](getattr(el, key))
        if (key in spec_dict):
            if (spec_dict[key] != attr_value):
                return None
            strength += 1
    return strength

dataset/ETHPy150Open ioam/holoviews/holoviews/operation/element.py image_overlay._match/original