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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):
 """Update SMART stats using the input method."""

        # Init new stats
        stats = self.get_init_value()

        if import_error_tag:
            return self.stats

        if self.input_method == 'local':
            stats = get_smart_data()
        elif self.input_method == 'snmp':
            pass

        # Update the stats
        self.stats = stats

        return self.stats