How to use the pikepdf.Operator function in pikepdf

def test_repr_dict(self):
        d = Dictionary({
            '/Boolean': True,
            '/Integer': 42,
            '/Real': Decimal('42.42'),
            '/String': String('hi'),
            '/Array': Array([1, 2, 3]),
            '/Operator': Operator('q'),
            '/Dictionary': Dictionary({'/Color': 'Red'})
        })
        expected = """\
            pikepdf.Dictionary({
                "/Array": [ 1, 2, 3 ],
                "/Boolean": True,
                "/Dictionary": {
                    "/Color": "Red"
                },
                "/Integer": 42,
                "/Operator": pikepdf.Operator("q"),
                "/Real": Decimal('42.42'),
                "/String": "hi"
            })
        """

def strip_invisible_text(pdf, page):
    stream = []
    in_text_obj = False
    render_mode = 0
    text_objects = []

    page.page_contents_coalesce()
    for operands, operator in pikepdf.parse_content_stream(page, ''):
        if not in_text_obj:
            if operator == pikepdf.Operator('BT'):
                in_text_obj = True
                render_mode = 0
                text_objects.append((operands, operator))
            else:
                stream.append((operands, operator))
        else:
            if operator == pikepdf.Operator('Tr'):
                render_mode = operands[0]
            text_objects.append((operands, operator))
            if operator == pikepdf.Operator('ET'):
                in_text_obj = False
                if render_mode != 3:
                    stream.extend(text_objects)
                text_objects.clear()

    def convert(op):

if operator == pikepdf.Operator('ET'):
                in_text_obj = False
                if render_mode != 3:
                    stream.extend(text_objects)
                text_objects.clear()

    def convert(op):
        try:
            return op.unparse()
        except AttributeError:
            return str(op).encode('ascii')

    lines = []

    for operands, operator in stream:
        if operator == pikepdf.Operator('INLINE IMAGE'):
            iim = operands[0]
            line = iim.unparse()
        else:
            line = b' '.join(convert(op) for op in operands) + b' ' + operator.unparse()
        lines.append(line)

    content_stream = b'\n'.join(lines)
    page.Contents = pikepdf.Stream(pdf, content_stream)

text_objects = []

    page.page_contents_coalesce()
    for operands, operator in pikepdf.parse_content_stream(page, ''):
        if not in_text_obj:
            if operator == pikepdf.Operator('BT'):
                in_text_obj = True
                render_mode = 0
                text_objects.append((operands, operator))
            else:
                stream.append((operands, operator))
        else:
            if operator == pikepdf.Operator('Tr'):
                render_mode = operands[0]
            text_objects.append((operands, operator))
            if operator == pikepdf.Operator('ET'):
                in_text_obj = False
                if render_mode != 3:
                    stream.extend(text_objects)
                text_objects.clear()

    def convert(op):
        try:
            return op.unparse()
        except AttributeError:
            return str(op).encode('ascii')

    lines = []

    for operands, operator in stream:
        if operator == pikepdf.Operator('INLINE IMAGE'):
            iim = operands[0]

stream = []
    in_text_obj = False
    render_mode = 0
    text_objects = []

    page.page_contents_coalesce()
    for operands, operator in pikepdf.parse_content_stream(page, ''):
        if not in_text_obj:
            if operator == pikepdf.Operator('BT'):
                in_text_obj = True
                render_mode = 0
                text_objects.append((operands, operator))
            else:
                stream.append((operands, operator))
        else:
            if operator == pikepdf.Operator('Tr'):
                render_mode = operands[0]
            text_objects.append((operands, operator))
            if operator == pikepdf.Operator('ET'):
                in_text_obj = False
                if render_mode != 3:
                    stream.extend(text_objects)
                text_objects.clear()

    def convert(op):
        try:
            return op.unparse()
        except AttributeError:
            return str(op).encode('ascii')

    lines = []