我有下面的代码。这只是一个起点。稍后我想从一个csv文件中的项目，我读和循环通过的每一个项目，以取代静态的“你好字”文本。我想在每一页的水印。

# importing the required modules
import PyPDF2
import io
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter

def add_watermark(wmFile, pageObj):
    # opening watermark pdf file
    wmFileObj = open(wmFile, 'rb')

    # creating pdf reader object of watermark pdf file
    pdfReader = PyPDF2.PdfFileReader(wmFileObj)

    # merging watermark pdf's first page with passed page object.
    pageObj.mergePage(pdfReader.getPage(0))

    # closing the watermark pdf file object
    wmFileObj.close()

    # returning watermarked page object
    return pageObj

def main():
    import PyPDF2
    import io
    from reportlab.pdfgen import canvas
    from reportlab.lib.pagesizes import letter
    # watermark pdf file name
    packet = io.BytesIO()
    # Create a new PDF with Reportlab
    can = canvas.Canvas(packet, pagesize=letter)
    can.setFont('Helvetica-Bold',18)
    can.drawString(10, 100, "Hello world")
    can.showPage()
    can.save()

    # Move to the beginning of the StringIO buffer
    packet.seek(0)
    mywatermark = PyPDF2.PdfFileReader(packet)

    # original pdf file name
    origFileName = 'Module1.pdf'

    # new pdf file name
    newFileName = 'watermarked_example.pdf'

    # creating pdf File object of original pdf
    pdfFileObj = open(origFileName, 'rb')

    # creating a pdf Reader object
    pdfReader = PyPDF2.PdfFileReader(pdfFileObj)

    # creating a pdf writer object for new pdf
    pdfWriter = PyPDF2.PdfFileWriter()

    # adding watermark to each page
    for page in range(pdfReader.numPages):
        # creating watermarked page object
        wmpageObj = add_watermark(mywatermark, pdfReader.getPage(page))

        # adding watermarked page object to pdf writer
        pdfWriter.addPage(wmpageObj)

    # new pdf file object
    newFile = open(newFileName, 'wb')

    # writing watermarked pages to new file
    pdfWriter.write(newFile)

    # closing the original pdf file object
    pdfFileObj.close()
    # closing the new pdf file object
    newFile.close()

if __name__ == "__main__":
    main()

我得到的错误是：

Traceback (most recent call last):
  File "watermark.py", line 101, in <module>
    main()
  File "watermark.py", line 83, in main
    wmpageObj = add_watermark(mywatermark, pdfReader.getPage(page))
  File "watermark.py", line 32, in add_watermark
    wmFileObj = open(wmFile, 'rb')
TypeError: expected str, bytes or os.PathLike object, not PdfFileReader

我想我已经明白了，它需要的是一个字符串、字节或文件，而我并没有写这些东西，它只是一个“对象”。
我尝试了几件事，但无论我尝试什么，实际上都会让事情变得更糟
有人能帮忙吗？我很确定这只是一件小事，因为我擅长监督显而易见的事情。
任何帮助都是感激的。
谢谢