1，代码结构

import os
from PyPDF2 import PdfReader, PdfWriter

class PdfMerge:
    def __init__(self, fileList, dstFile):
        self.fileList = fileList
        self.dstFile = dstFile
    def readPdf(self, pdfFile, pageRange):
    def writePdf(self, pageList): 
    def getRangeList(self, rangeStr):
    def mergePdf(self):

def main():
if __name__ == "__main__":
    main()

2，代码详解

2.1，将范围字符串转成list

如：
“0:5” 转成 [0,1,2,3,4]
“0,1,2,3,6,7” 转成 [0,1,2,3,6,7]
“2” 转成 [2]

    def getRangeList(self, rangeStr):
        rangeList = []
        if rangeStr.find(':') >= 0:
            r = rangeStr.split(':')
            if len(r) != 2:
                print("rangeStr[%s] split [:] failed!"%(rangeStr))
                return rangeList
            mi = int(r[0])
            ma = int(r[1])
            for i in range(mi, ma):
                rangeList.append(i)
        elif rangeStr.find(',') >= 0:
            r = rangeStr.split(',')
            mi = int(r[0])
            ma = int(r[1])
            for i in r:
                rangeList.append(int(i))
        elif rangeStr.isnumeric():
            rangeList.append(int(rangeStr))
        else:
            print("rangeStr split failed! not find [:] and [,]")
        return rangeList

2.2，获取pdf文件特定页

    def readPdf(self, pdfFile, pageRange):
        pageList = []
        pdf_reader = PdfReader(pdfFile)
        for i in range(len(pdf_reader.pages)):
            if i in pageRange:
                pageList.append(pdf_reader.pages[i])
        return pageList

2.3，将pdf页list合并为pdf文件并保存

    def writePdf(self, pageList): 
        pdf_writer = PdfWriter()
        for page in pageList:
            pdf_writer.add_page(page)
        with open(self.dstFile, 'wb') as out:
            pdf_writer.write(out)

2.4，遍历所有要合并的文件，进行合并

    def mergePdf(self):
        pageList = []
        for pdf in self.fileList:
            file = pdf["file"]
            fileRange = self.getRangeList(pdf["range"])
            print("file[{}] rangeStr[{}] rangeList{}".format(file, pdf["range"], fileRange))
            pageList.extend(self.readPdf(file, fileRange))
        self.writePdf(pageList)

2.5，给出要合并的pdf文件及范围，合并到指定文件

def main():
    fileList = [{"file":"source/1_任务书.pdf", "range":"0:10"},{"file":"source/20230409074902162.pdf", "range":"0"}]
    #fileList = [{"file":"source/1_任务书.pdf", "range":"0,1,5,6,7"},{"file":"source/20230409074902162.pdf", "range":"0"}]
    fileProcess = PdfMerge(fileList, "source/任务书.pdf")
    fileProcess.mergePdf()

3，完整代码

import os
from PyPDF2 import PdfReader, PdfWriter

class PdfMerge:
    def __init__(self, fileList, dstFile):
        self.fileList = fileList
        self.dstFile = dstFile
       
    def readPdf(self, pdfFile, pageRange):
        pageList = []
        pdf_reader = PdfReader(pdfFile)
        for i in range(len(pdf_reader.pages)):
            if i in pageRange:
                pageList.append(pdf_reader.pages[i])
        return pageList
    
    def writePdf(self, pageList): 
        pdf_writer = PdfWriter()
        for page in pageList:
            pdf_writer.add_page(page)
        with open(self.dstFile, 'wb') as out:
            pdf_writer.write(out)
    
    def getRangeList(self, rangeStr):
        rangeList = []
        if rangeStr.find(':') >= 0:
            r = rangeStr.split(':')
            if len(r) != 2:
                print("rangeStr[%s] split [:] failed!"%(rangeStr))
                return rangeList
            mi = int(r[0])
            ma = int(r[1])
            for i in range(mi, ma):
                rangeList.append(i)
        elif rangeStr.find(',') >= 0:
            r = rangeStr.split(',')
            mi = int(r[0])
            ma = int(r[1])
            for i in r:
                rangeList.append(int(i))
        elif rangeStr.isnumeric():
            rangeList.append(int(rangeStr))
        else:
            print("rangeStr split failed! not find [:] and [,]")
        return rangeList
 
    def mergePdf(self):
        pageList = []
        for pdf in self.fileList:
            file = pdf["file"]
            fileRange = self.getRangeList(pdf["range"])
            print("file[{}] rangeStr[{}] rangeList{}".format(file, pdf["range"], fileRange))
            pageList.extend(self.readPdf(file, fileRange))
        self.writePdf(pageList)

def main():
    fileList = [{"file":"source/1_任务书.pdf", "range":"0:10"},{"file":"source/20230409074902162.pdf", "range":"0"}]
   # fileList = [{"file":"source/1_任务书.pdf", "range":"0,1,5,6,7"},{"file":"source/20230409074902162.pdf", "range":"0"}]
    fileProcess = PdfMerge(fileList, "source/任务书.pdf")
    fileProcess.mergePdf()

if __name__ == "__main__":
    main()

4，执行结果