How to use the autopep8.Reindenter function in autopep8

def test_reindenter_with_non_standard_indent_size(self):
        reindenter = autopep8.Reindenter('if True:\n  pass\n')

        self.assertEqual('if True:\n   pass\n',
                         reindenter.run(3))

def test_reindenter_should_leave_stray_comment_alone(self):
        lines = '  #\nif True:\n  pass\n'

        reindenter = autopep8.Reindenter(lines)

        self.assertEqual('  #\nif True:\n    pass\n',
                         reindenter.run())

def test_reindenter_with_good_input(self):
        lines = 'if True:\n    pass\n'

        reindenter = autopep8.Reindenter(lines)

        self.assertEqual(lines,
                         reindenter.run())

def test_reindenter(self):
        reindenter = autopep8.Reindenter('if True:\n  pass\n')

        self.assertEqual('if True:\n    pass\n',
                         reindenter.run())

def reindent(source, indent_size):
    """Reindent all lines."""
    reindenter = Reindenter(source)
    return reindenter.run(indent_size)