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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 parse_function_type_comment(type_comment: str) -> Optional[FunctionType]: """Given a correct type comment, obtain a FunctionType object"""

    if _ast_py3 is None:
        return None

    func_type = _ast_py3.parse(type_comment, "<type_comment>", "func_type")
    return FunctionType(argtypes=func_type.argtypes, returns=func_type.returns)