Python pypdf2：如何将大纲转换为输出pdf

我有两个PDF

我想把它们合并成一个pdf，包括它们的大纲

我可以使用其他工具来实现这一点，但我想特别使用pypdf2

import PyPDF2 
 
# Open the files that have to be merged one by one
pdf1File = open('FirstInputFile.pdf', 'rb')
pdf2File = open('SecondInputFile.pdf', 'rb')
 
# Read the files that you have opened
pdf1Reader = PyPDF2.PdfFileReader(pdf1File)
pdf2Reader = PyPDF2.PdfFileReader(pdf2File)
 
# Create a new PdfFileWriter object which represents a blank PDF document
pdfWriter = PyPDF2.PdfFileWriter()
 
# Loop through all the pagenumbers for the first document
for pageNum in range(pdf1Reader.numPages):
    pageObj = pdf1Reader.getPage(pageNum)
    pdfWriter.addPage(pageObj)
 
# Loop through all the pagenumbers for the second document
for pageNum in range(pdf2Reader.numPages):
    pageObj = pdf2Reader.getPage(pageNum)
    pdfWriter.addPage(pageObj)

#GET THE OUTLINES
outline1 = pdf1Reader.outlines
outline2 = pdf2Reader.outlines
total_outlines = outline1+outline2

#ADDING THE OUTLINE TO pdfWriter
pdfWriter.addBookmarkDestination(total_outlines)


# Now that you have copied all the pages in both the documents, write them into the a new document
pdfOutputFile = open('MergedFiles.pdf', 'wb')
pdfWriter.write(pdfOutputFile)

# Close all the files - Created as well as opened
pdfOutputFile.close()
pdf1File.close()
pdf2File.close()

在这里，我尝试使用

#GET THE OUTLINES
outline1 = pdf1Reader.outlines
outline2 = pdf2Reader.outlines
total_outlines = outline1+outline2'

#ADDING THE OUTLINE TO pdfWriter
pdfWriter.addBookmarkDestination(total_outlines)

但这会产生错误

Traceback (most recent call last):
  File "test100.py", line 15, in <module>
    output.addBookmarkDestination(reader1.outlines+reader2.outlines)
  File "/usr/lib/python3.7/site-packages/PyPDF2/pdf.py", line 661, in addBookmarkDestination
    parent.addChild(destRef, self)
  File "/usr/lib/python3.7/site-packages/PyPDF2/generic.py", line 666, in addChild
    childObj = child.getObject()
  File "/usr/lib/python3.7/site-packages/PyPDF2/generic.py", line 178, in getObject
    return self.pdf.getObject(self).getObject()
AttributeError: 'list' object has no attribute 'getObject'

回溯（最近一次呼叫最后一次）：
文件“test100.py”，第15行，在
output.addBookmarkDestination（reader1.outlines+reader2.outlines）
文件“/usr/lib/python3.7/site packages/PyPDF2/pdf.py”，第661行，位于addBookmarkDestination中
parent.addChild（destRef，self）
addChild中的文件“/usr/lib/python3.7/site packages/PyPDF2/generic.py”，第666行
childObj=child.getObject（）
getObject中的文件“/usr/lib/python3.7/site packages/PyPDF2/generic.py”，第178行
返回self.pdf.getObject（self.getObject（））
AttributeError:“list”对象没有属性“getObject”

那么，什么是正确的方法来完成这项工作呢