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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 partition(self, key, partitions):
 """ Select a partition based on the hash of the key. :param key: Partition key :type key: text string or UTF-8 `bytes` or `bytearray` :param list partitions: An indexed sequence of partition identifiers. :returns: One of the given partition identifiers. The result will be the same each time the same key and partition list is passed. """

        return partitions[(self._hash(key) & 0x7FFFFFFF) % len(partitions)]