How to use the yamllint.linter.PROBLEM_LEVELS function in yamllint

if self.format == 'parsable':
            format_method = Format.parsable
        else:
            format_method = Format.standard_color

        for yaml_file in find_files(rootdir, self.excludes, None, r'\.ya?ml$'):
            first = True
            with open(yaml_file, 'r') as contents:
                for problem in linter.run(contents, config):
                    if first and self.format != 'parsable':
                        print('\n{0}:'.format(os.path.relpath(yaml_file)))
                        first = False

                    print(format_method(problem, yaml_file))
                    if problem.level == linter.PROBLEM_LEVELS[2]:
                        has_errors = True
                    elif problem.level == linter.PROBLEM_LEVELS[1]:
                        has_warnings = True

        if has_errors or has_warnings:
            print('yamllint issues found')
            raise SystemExit(1)

if self.format == 'parsable':
            format_method = Format.parsable
        else:
            format_method = Format.standard_color

        for yaml_file in find_files(os.getcwd(), self.excludes, None, r'\.ya?ml$'):
            first = True
            with open(yaml_file, 'r') as contents:
                for problem in linter.run(contents, config):
                    if first and self.format != 'parsable':
                        print('\n{0}:'.format(os.path.relpath(yaml_file)))
                        first = False

                    print(format_method(problem, yaml_file))
                    if problem.level == linter.PROBLEM_LEVELS[2]:
                        has_errors = True
                    elif problem.level == linter.PROBLEM_LEVELS[1]:
                        has_warnings = True

        if has_errors or has_warnings:
            print('yamllint issues found')
            raise SystemExit(1)

if args.format == 'parsable':
                        print(Format.parsable(problem, file))
                    elif supports_color():
                        if first:
                            print('\033[4m%s\033[0m' % file)
                            first = False

                        print(Format.standard_color(problem, file))
                    else:
                        if first:
                            print(file)
                            first = False

                        print(Format.standard(problem, file))

                    max_level = max(max_level, PROBLEM_LEVELS[problem.level])

            if not first and args.format != 'parsable':
                print('')
        except EnvironmentError as e:
            print(e, file=sys.stderr)
            sys.exit(-1)

    if max_level == PROBLEM_LEVELS['error']:
        return_code = 1
    elif max_level == PROBLEM_LEVELS['warning']:
        return_code = 2 if args.strict else 0
    else:
        return_code = 0

    sys.exit(return_code)

format_method = Format.parsable
        else:
            format_method = Format.standard_color

        for yaml_file in find_files(os.getcwd(), self.excludes, None, r'^[^\.].*\.ya?ml$'):
            first = True
            with open(yaml_file, 'r') as contents:
                for problem in linter.run(contents, config):
                    if first and self.format != 'parsable':
                        print('\n{0}:'.format(os.path.relpath(yaml_file)))
                        first = False

                    print(format_method(problem, yaml_file))
                    if problem.level == linter.PROBLEM_LEVELS[2]:
                        has_errors = True
                    elif problem.level == linter.PROBLEM_LEVELS[1]:
                        has_warnings = True

        if has_errors or has_warnings:
            print('yamllint issues found')
            raise SystemExit(1)

prob_level = show_problems(problems, file, args_format=args.format,
                                   no_warn=args.no_warnings)
        max_level = max(max_level, prob_level)

    # read yaml from stdin
    if args.stdin:
        try:
            problems = linter.run(sys.stdin, conf, '')
        except EnvironmentError as e:
            print(e, file=sys.stderr)
            sys.exit(-1)
        prob_level = show_problems(problems, 'stdin', args_format=args.format,
                                   no_warn=args.no_warnings)
        max_level = max(max_level, prob_level)

    if max_level == PROBLEM_LEVELS['error']:
        return_code = 1
    elif max_level == PROBLEM_LEVELS['warning']:
        return_code = 2 if args.strict else 0
    else:
        return_code = 0

    sys.exit(return_code)

def show_problems(problems, file, args_format, no_warn):
    max_level = 0
    first = True

    for problem in problems:
        max_level = max(max_level, PROBLEM_LEVELS[problem.level])
        if no_warn and (problem.level != 'error'):
            continue
        if args_format == 'parsable':
            print(Format.parsable(problem, file))
        elif args_format == 'colored' or \
                (args_format == 'auto' and supports_color()):
            if first:
                print('\033[4m%s\033[0m' % file)
                first = False
            print(Format.standard_color(problem, file))
        else:
            if first:
                print(file)
                first = False
            print(Format.standard(problem, file))