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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 token_handler_unobfuscate( token, dispatcher, node, subnode, sourcepath_stack=(None,)):
 """ A token handler that will resolve and return the original identifier value. """


    original = (
        node.value
        if isinstance(node, Identifier) and node.value != subnode else
        None
    )

    if isinstance(token.pos, int):
        _, lineno, colno = node.getpos(original or subnode, token.pos)
    else:
        lineno, colno = None, None

    yield StreamFragment(
        subnode, lineno, colno, original, sourcepath_stack[-1])