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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 update(self, validate=False):
 """ Update the data associated with this volume by querying EC2. :type validate: bool :param validate: By default, if EC2 returns no data about the volume the update method returns quietly. If the validate param is True, however, it will raise a ValueError exception if no data is returned from EC2. """

        # Check the resultset since Eucalyptus ignores the volumeId param
        unfiltered_rs = self.connection.get_all_volumes([self.id])
        rs = [ x for x in unfiltered_rs if x.id == self.id ]
        if len(rs) > 0:
            self._update(rs[0])
        elif validate:
            raise ValueError('%s is not a valid Volume ID' % self.id)
        return self.status