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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 hexblock_cb(cls, callback, data, address = None, bits = None, width = 16, cb_args = (), cb_kwargs = {}):
 """ Dump a block of binary data using a callback function to convert each line of text. @type callback: function @param callback: Callback function to convert each line of data. @type data: str @param data: Binary data. @type address: str @param address: (Optional) Memory address where the data was read from. @type bits: int @param bits: (Optional) Number of bits of the target architecture. The default is platform dependent. See: L{HexDump.address_size} @type cb_args: str @param cb_args: (Optional) Arguments to pass to the callback function. @type cb_kwargs: str @param cb_kwargs: (Optional) Keyword arguments to pass to the callback function. @type width: int @param width: (Optional) Maximum number of bytes to convert per text line. @rtype: str @return: Multiline output text. """

        result = ''
        if address is None:
            for i in compat.xrange(0, len(data), width):
                result = '%s%s\n' % ( result, \
                             callback(data[i:i+width], *cb_args, **cb_kwargs) )
        else:
            for i in compat.xrange(0, len(data), width):
                result = '%s%s: %s\n' % (
                             result,
                             cls.address(address, bits),
                             callback(data[i:i+width], *cb_args, **cb_kwargs)
                             )
                address += width
        return result