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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def multi_constructor_pkl(loader, tag_suffix, node):
 """ Constructor function passed to PyYAML telling it how to load objects from paths to .pkl files. See PyYAML documentation for details on the call signature. """


    mapping = loader.construct_yaml_str(node)
    if tag_suffix != "" and tag_suffix != u"":
        raise AssertionError('Expected tag_suffix to be "" but it is "'+tag_suffix+'"')

    rval = ObjectProxy(None, {}, yaml.serialize(node))
    rval.instance = serial.load(mapping)

    return rval