How to use the httprunner.logger.log_warning function in httprunner

elif not test_extracors:
        return api_extrators

    else:
        extractor_dict = OrderedDict()
        for api_extrator in api_extrators:
            if len(api_extrator) != 1:
                logger.log_warning("incorrect extractor: {}".format(api_extrator))
                continue

            var_name = list(api_extrator.keys())[0]
            extractor_dict[var_name] = api_extrator[var_name]

        for test_extrator in test_extracors:
            if len(test_extrator) != 1:
                logger.log_warning("incorrect extractor: {}".format(test_extrator))
                continue

            var_name = list(test_extrator.keys())[0]
            extractor_dict[var_name] = test_extrator[var_name]

        extractor_list = []
        for key, value in extractor_dict.items():
            extractor_list.append({key: value})

        return extractor_list

def load_file(file_path):
    if not os.path.isfile(file_path):
        raise exception.FileNotFoundError("{} does not exist.".format(file_path))

    file_suffix = os.path.splitext(file_path)[1].lower()
    if file_suffix == '.json':
        return _load_json_file(file_path)
    elif file_suffix in ['.yaml', '.yml']:
        return _load_yaml_file(file_path)
    elif file_suffix == ".csv":
        return _load_csv_file(file_path)
    else:
        # '' or other suffix
        err_msg = u"Unsupported file format: {}".format(file_path)
        logger.log_warning(err_msg)
        return []

extend_test_api(test_block_dict)
                    testset["testcases"].append(test_block_dict)
                elif "suite" in test_block_dict:
                    ref_name = test_block_dict["suite"]
                    test_info = get_testinfo_by_reference(ref_name, "suite")
                    testset["testcases"].extend(test_info["testcases"])
                else:
                    testset["testcases"].append(test_block_dict)

            elif key == "api":
                api_def = item["api"].pop("def")
                function_meta = parse_function(api_def)
                func_name = function_meta["func_name"]

                if func_name in testset["api"]:
                    logger.log_warning("api definition duplicated: {}".format(func_name))

                api_info = {}
                api_info["function_meta"] = function_meta
                api_info.update(item["api"])
                testset["api"][func_name] = api_info

            else:
                logger.log_warning(
                    "unexpected block: {}. block should only be 'config', 'test' or 'api'.".format(key)
                )

    return testset

""" locusts -f locustfile.py --processes 4
        """
        if "--no-web" in sys.argv:
            logger.log_error("conflict parameter args: --processes & --no-web. \nexit.")
            sys.exit(1)

        processes_index = sys.argv.index('--processes')

        processes_count_index = processes_index + 1

        if processes_count_index >= len(sys.argv):
            """ do not specify processes count explicitly
                locusts -f locustfile.py --processes
            """
            processes_count = multiprocessing.cpu_count()
            logger.log_warning("processes count not specified, use {} by default.".format(processes_count))
        else:
            try:
                """ locusts -f locustfile.py --processes 4 """
                processes_count = int(sys.argv[processes_count_index])
                sys.argv.pop(processes_count_index)
            except ValueError:
                """ locusts -f locustfile.py --processes -P 8888 """
                processes_count = multiprocessing.cpu_count()
                logger.log_warning("processes count not specified, use {} by default.".format(processes_count))

        sys.argv.pop(processes_index)
        locusts.run_locusts_with_processes(sys.argv, processes_count)
    else:
        locusts.main()

def main_locust():
    """ Performance test with locust: parse command line options and run commands.
    """
    logger.setup_logger("INFO")

    try:
        from httprunner import locusts
    except ImportError:
        msg = "Locust is not installed, install first and try again.\n"
        msg += "install command: pip install locustio"
        logger.log_warning(msg)
        exit(1)

    sys.argv[0] = 'locust'
    if len(sys.argv) == 1:
        sys.argv.extend(["-h"])

    if sys.argv[1] in ["-h", "--help", "-V", "--version"]:
        locusts.main()
        sys.exit(0)

    try:
        testcase_index = sys.argv.index('-f') + 1
        assert testcase_index < len(sys.argv)
    except (ValueError, AssertionError):
        logger.log_error("Testcase file is not specified, exit.")
        sys.exit(1)

def prettify_json_file(file_list):
    """ prettify JSON testset format
    """
    for json_file in set(file_list):
        if not json_file.endswith(".json"):
            logger.log_warning("Only JSON file format can be prettified, skip: {}".format(json_file))
            continue

        logger.color_print("Start to prettify JSON file: {}".format(json_file), "GREEN")

        dir_path = os.path.dirname(json_file)
        file_name, file_suffix = os.path.splitext(os.path.basename(json_file))
        outfile = os.path.join(dir_path, "{}.pretty.json".format(file_name))

        with io.open(json_file, 'r', encoding='utf-8') as stream:
            try:
                obj = json.load(stream)
            except ValueError as e:
                raise SystemExit(e)

        with io.open(outfile, 'w', encoding='utf-8') as out:
            json.dump(obj, out, indent=4, separators=(',', ': '))

def validate_json_file(file_list):
    """ validate JSON testset format
    """
    for json_file in set(file_list):
        if not json_file.endswith(".json"):
            logger.log_warning("Only JSON file format can be validated, skip: {}".format(json_file))
            continue

        logger.color_print("Start to validate JSON file: {}".format(json_file), "GREEN")

        with io.open(json_file) as stream:
            try:
                json.load(stream)
            except ValueError as e:
                raise SystemExit(e)

        print("OK")

def extract_output(self, output_variables_list):
        """ extract output variables
        """
        variables_mapping = self.context.testcase_variables_mapping

        output = {}
        for variable in output_variables_list:
            if variable not in variables_mapping:
                logger.log_warning(
                    "variable '{}' can not be found in variables mapping, failed to output!"\
                        .format(variable)
                )
                continue

            output[variable] = variables_mapping[variable]

        return output

teststep_dict.get("variables", []),
                    teststep_dict.get("parameters", [])
                )
                for testcase_variables in testcase_parametered_variables_list:
                    teststep_dict["variables"] = testcase_variables

                    # eval teststep name with bind variables
                    variables = utils.override_variables_binds(
                        config_variables,
                        testcase_variables
                    )
                    self.testcase_parser.update_binded_variables(variables)
                    try:
                        testcase_name = self.testcase_parser.eval_content_with_bindings(teststep_dict["name"])
                    except (AssertionError, exceptions.ParamsError):
                        logger.log_warning("failed to eval teststep name: {}".format(teststep_dict["name"]))
                        testcase_name = teststep_dict["name"]
                    self.test_runner_list.append((test_runner, variables))

                    self._add_test_to_suite(testcase_name, test_runner, teststep_dict)