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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 from_seedhex_file(path: str) -> SigningKeyType: """ Return SigningKey instance from Seedhex file :param str path: Hexadecimal seed file path """

        with open(path, 'r') as fh:
            seedhex = fh.read()
        return SigningKey.from_seedhex(seedhex)