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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 extractValue(self, model, item):
 """ Get the path referenced by this column's attribute. @param model: Either a TabularDataModel or a ScrollableView, depending on what this column is part of. @param item: A port item instance (as defined by L{xmantissa.port}). @rtype: C{unicode} """

        certPath = super(CertificateColumn, self).extractValue(model, item)
        return certPath.path.decode('utf-8', 'replace')