<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def schema(self):
 """ The DQL fragment for constructing this index """

        if self.status == "DELETING":
            return ""
        parts = ["GLOBAL", self.index_type, "INDEX"]
        parts.append("('%s', %s," % (self.name, self.hash_key.name))
        if self.range_key:
            parts.append("%s," % self.range_key.name)
        if self.includes:
            parts.append("[%s]," % ", ".join(("'%s'" % i for i in self.includes)))

        parts.append(
            "THROUGHPUT (%d, %d))" % (self.read_throughput, self.write_throughput)
        )
        return " ".join(parts)