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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 load(cls, file_path):
 """ Create and return a new Session Token based on the contents of a previously saved JSON-format file. :type file_path: str :param file_path: The fully qualified path to the JSON-format file containing the previously saved Session Token information. """

        fp = open(file_path)
        json_doc = fp.read()
        fp.close()
        return cls.from_json(json_doc)