How to use the autopep8.fix_file function in autopep8

def test_fix_file_with_diff(self):
        filename = os.path.join(ROOT_DIR, 'test', 'example.py')

        self.assertIn(
            '@@',
            autopep8.fix_file(
                filename=filename,
                options=autopep8.parse_args(['--diff', filename])))

def check(expected_filename, input_filename, aggressive):
    """Test and compare output.

    Return True on success.

    """
    got = autopep8.fix_file(
        input_filename,
        options=autopep8.parse_args([''] + aggressive * ['--aggressive']))

    try:
        with autopep8.open_with_encoding(expected_filename) as expected_file:
            expected = expected_file.read()
    except IOError:
        expected = None

    if expected == got:
        return True
    else:
        got_filename = expected_filename + '.err'
        encoding = autopep8.detect_encoding(input_filename)

        with autopep8.open_with_encoding(got_filename,

def test_fix_file(self):
        self.assertIn(
            'import ',
            autopep8.fix_file(
                filename=os.path.join(ROOT_DIR, 'test', 'example.py')))

def autopep8_context(line, options=None):
    if not options:
        options = []

    with temporary_file_context(line) as filename:
        options = autopep8.parse_args([filename] + list(options))
        yield autopep8.fix_file(filename=filename, options=options)

def run_autopep(filename):
    cmd_args = ['dummy', '-d']
    args = autopep8.parse_args(cmd_args)
    args.aggressive = 2
    args.in_place = True
    args.diff = False
    args.max_line_length = 66
    autopep8.fix_file(filename, args)

    if not any(x in filename for x in import_fixed) or "internal" in filename:
        isort.SortImports(filename)
        run_autoflake(filename)

if any(x not in args for x in ['-i', '--in-place']):
        args.append('-i')

    args.append('--ignore=E261,E265,E402,E501')
    args.insert(0, 'dummy')

    cmd_args = autopep8.parse_args(args)

    excludes = ('ext-lib', 'ext-src')
    for p in options.plugin.source_dir.walk():
        if any(exclude in p for exclude in excludes):
            continue

        if p.fnmatch('*.py'):
            autopep8.fix_file(p, options=cmd_args)