python PyPDF2模块合成pdf问题

#利用PyPDF2模块将两个pdf文档合成一个新pdf

import os,PyPDF2



os.chdir(r'C:\Users\hjf\Desktop')



pdfWriter = PyPDF2.PdfFileWriter()



pdf1 = open('test1.pdf','rb')

pdf1Reader = PyPDF2.PdfFileReader(pdf1)

for pageNum in range(pdf1Reader.numPages):

    page=pdf1Reader.getPage(pageNum)

    pdfWriter.addPage(page)



pdf2 = open('test2.pdf','rb')

pdf2Reader = PyPDF2.PdfFileReader(pdf2)

for pageNum in range(pdf2Reader.numPages):

    page=pdf2Reader.getPage(pageNum)

    page.rotateClockwise(180)

    pdfWriter.addPage(page)



pdf3 = open('test3.pdf','wb')

pdfWriter.write(pdf3)



pdf3.close()

pdf1.close()

pdf2.close()

#利用PyPDF2模块将两个pdf文档合成一个新pdf

import os, PyPDF2



os.chdir(r'C:\Users\hjf\Desktop')

with open('test3.pdf', 'wb') as pdf3:

    writer = PyPDF2.PdfFileWriter()

    with open('test1.pdf', 'rb') as pdf1:

        pdf1Reader = PyPDF2.PdfFileReader(pdf1)

        for pageNum in range(pdf1Reader.numPages):

            page = pdf1Reader.getPage(pageNum)

            writer.addPage(page)



    with open('test2.pdf', 'rb') as pdf2:

        pdf2Reader = PyPDF2.PdfFileReader(pdf2)

        for pageNum in range(pdf2Reader.numPages):

            page = pdf2Reader.getPage(pageNum)

            page.rotateClockwise(180)

            writer.addPage(page)



    writer.write(pdf3)