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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 make_report(self):
 """ Makes a html report and saves it into the same folder where logs are stored. """

        if self.execution_stats is None:
            raise RuntimeError('Cannot produce a report without running the executor first, check EOExecutor.run '
                               'method')

        if os.environ.get('DISPLAY', '') == '':
            LOGGER.info('No display found, using non-interactive Agg backend')
            plt.switch_backend('Agg')

        dependency_graph = self._create_dependency_graph()
        task_descriptions = self._get_task_descriptions()

        formatter = HtmlFormatter(linenos=True)
        task_source = self._render_task_source(formatter)
        execution_stats = self._render_execution_errors(formatter)

        template = self._get_template()

        html = template.render(dependency_graph=dependency_graph,
                               task_descriptions=task_descriptions,
                               task_source=task_source,
                               execution_stats=execution_stats,
                               execution_logs=self.execution_logs,
                               code_css=formatter.get_style_defs())

        if not os.path.isdir(self.report_folder):
            os.mkdir(self.report_folder)

        with open(self.get_report_filename(), 'w') as fout:
            fout.write(html)