Returns all errors as a string

def errors_string(self):
        """
        Returns all errors as a string
        """
        output = []
        for e in self.errors:
            output.append('%s: %s in %s:' % (e[1], e[2], e[0]))
            output.append(''.join(traceback.format_tb(e[3])))
        return '\n'.join(output)