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ndS(s�Initialize a new DNS Update object.

        @param zone: The zone which is being updated.
        @type zone: A dns.name.Name or string
        @param rdclass: The class of the zone; defaults to dns.rdataclass.IN.
        @type rdclass: An int designating the class, or a string whose value
        is the name of a class.
        @param keyring: The TSIG keyring to use; defaults to None.
        @type keyring: dict
        @param keyname: The name of the TSIG key to use; defaults to None.
        The key must be defined in the keyring.  If a keyring is specified
        but a keyname is not, then the key used will be the first key in the
        keyring.  Note that the order of keys in a dictionary is not defined,
        so applications should supply a keyname when a keyring is used, unless
        they know the keyring contains only one key.
        @type keyname: dns.name.Name or string
        @param keyalgorithm: The TSIG algorithm to use; defaults to
        dns.tsig.default_algorithm.  Constants for TSIG algorithms are defined
        in dns.tsig, and the currently implemented algorithms are
        HMAC_MD5, HMAC_SHA1, HMAC_SHA224, HMAC_SHA256, HMAC_SHA384, and
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