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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 memory_zones(self):
 """Gets all memory zones supported by the current target. Some targets support multiple memory zones. This function provides the ability to get a list of all the memory zones to facilate using the memory zone routing functions. Args: self (JLink):
 the ``JLink`` instance Returns: A list of all the memory zones as ``JLinkMemoryZone`` structures. Raises: JLinkException: on hardware errors. """

        count = self.num_memory_zones()
        if count == 0:
            return list()

        buf = (structs.JLinkMemoryZone * count)()
        res = self._dll.JLINK_GetMemZones(buf, count)
        if res < 0:
            raise errors.JLinkException(res)

        return list(buf)