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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 has_operator_manifest(self):
 """ Check if Dockerfile sets the operator manifest label :return: bool """

        dockerfile = df_parser(self.workflow.builder.df_path, workflow=self.workflow)
        labels = Labels(dockerfile.labels)
        try:
            _, operator_label = labels.get_name_and_value(Labels.LABEL_TYPE_OPERATOR_MANIFESTS)
        except KeyError:
            operator_label = 'false'
        return operator_label.lower() == 'true'