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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 init(self, db=RDB_DB, host=RDB_HOST, port=RDB_PORT):
 """Create the Frink object to store the connection credentials."""

        self.RDB_HOST = host
        self.RDB_PORT = port
        self.RDB_DB = db

        from .connection import RethinkDB
        self.rdb = RethinkDB()
        self.rdb.init()