Am trying to populate data from csv into a pdf form using PYPDF2 library. However, getting following error when using the latest version of PYPDF2
TypeError: sequence indices must be integers

import pandas as pd
import os
from PyPDF2 import PdfWriter, PdfReader
from PyPDF2.generic import BooleanObject, NameObject, IndirectObject


def set_need_appearances_writer(writer: PdfWriter):
    try:
        catalog = writer._root_object
        if "/AcroForm" not in catalog:
            writer._root_object.update({
                NameObject("/AcroForm"): IndirectObject(len(writer._objects), 0, writer)})
        need_appearances = NameObject("/NeedAppearances")
        writer._root_object["/AcroForm"][need_appearances] = BooleanObject(True)
        return writer

    except Exception as e:
        print('set_need_appearances_writer() catch : ', repr(e))
        return writer


if __name__ == '__main__':
    csv_filename = "filled-w9.csv"
    pdf_filename = "form-w9.pdf"

    csvin = os.path.normpath(os.path.join(os.getcwd(), 'in', csv_filename))
    pdfin = os.path.normpath(os.path.join(os.getcwd(), 'in', pdf_filename))
    pdfout = os.path.normpath(os.path.join(os.getcwd(), 'out'))
    data = pd.read_csv(csvin)
    reader = PdfReader(open(pdfin, "rb"), strict=False)
    if "/AcroForm" in reader.trailer["/Root"]:
        reader.trailer["/Root"]["/AcroForm"].update(
            {NameObject("/NeedAppearances"): BooleanObject(True)})
    pdf_fields = [str(x) for x in reader.get_fields().keys()]  # List of all pdf field names
    csv_fields = data.columns.tolist()

    i = 0  # Filename numerical prefix
    for j, rows in data.iterrows():
        i += 1
        writer = PdfWriter()
        set_need_appearances_writer(writer)
        if "/AcroForm" in writer._root_object:
            writer._root_object["/AcroForm"].update(
                {NameObject("/NeedAppearances"): BooleanObject(True)})

        # Key = pdf_field_name : Value = csv_field_value
        field_dictionary_1 = {"f1_01[0]": str(rows['f1_01[0]']),
                              "f1_02[0]": (rows['f1_02[0]']),
                              "c1_1[0]": (rows['c1_1[0]']),
                              "c1_1[1]": (rows['c1_1[1]']),
                              "c1_1[2]": (rows['c1_1[2]']),
                              "c1_1[3]": (rows['c1_1[3]']),
                              "c1_1[4]": (rows['c1_1[4]']),
                              "c1_1[5]": (rows['c1_1[5]']),
                              "f1_03[0]": (rows['f1_03[0]']),
                              "c1_1[6]": (rows['c1_1[6]']),
                              "f1_04[0]": (rows['f1_04[0]']),
                              "c1_2[0]": (rows['c1_2[0]']),
                              "Boxes3a-b_ReadOrder[0]": (rows['Boxes3a-b_ReadOrder[0]']),
                              "f1_05[0]": (rows['f1_05[0]']),
                              "f1_06[0]": (rows['f1_06[0]']),
                              "f1_07[0]": (rows['f1_07[0]']),
                              "f1_08[0]": (rows['f1_08[0]']),
                              "Address_ReadOrder[0]": (rows['Address_ReadOrder[0]']),
                              "f1_09[0]": (rows['f1_09[0]']),
                              "f1_10[0]": (rows['f1_10[0]']),
                              "f1_11[0]": (rows['f1_11[0]']),
                              "f1_12[0]": (rows['f1_12[0]']),
                              "f1_13[0]": (rows['f1_13[0]']),
                              "f1_14[0]": (rows['f1_14[0]']),
                              "f1_15[0]": (rows['f1_15[0]']),
                              }

        temp_out_dir = os.path.normpath(os.path.join(pdfout, str(i) + 'out.pdf'))
        page = writer.pages[reader.pages[0]]
        writer.update_page_form_field_values(writer.get_page(0), field_dictionary_1)
        # pdf2.addPage(pdf.getPage(1))
        # pdf2.addPage(pdf.getPage(2))
        # pdf2.addPage(pdf.getPage(3))
        # pdf2.addPage(pdf.getPage(4))
        # pdf2.addPage(pdf.getPage(5))
        outputStream = open(temp_out_dir, "wb")
        writer.write(outputStream)
        outputStream.close()
    print(f'Process Complete: {i} PDFs Processed!')

changed line 75 in my code from this page=writer.pages(reader.pages(0))to this page=writer.pages[reader.pages[0]], still does not work