PDF text merge

import os
from PyPDF2 import PdfFileReader, PdfFileWriter

#  Use os Modular walk function , Search out all under the specified directory PDF file 
#  Get all in the same directory PDF The absolute path to the file 
def getnumber(path):
    try:
        res = int(os.path.basename(path).split('.')[0])
    except:
        res = 10000000
    return res

def getFileName(filedir):

    file_list = [os.path.join(root, filespath) \
                 for root, dirs, files in os.walk(filedir) \
                 for filespath in files \
                 if str(filespath).endswith('pdf')
                 ]
    file_list = sorted(file_list,key=lambda x: getnumber(x))  
    return file_list if file_list else []

#  Merge all under the same directory PDF file 
def MergePDF(filepath, outfile):
    output = PdfFileWriter()
    outputPages = 0
    pdf_fileName = getFileName(filepath)

    if pdf_fileName:
        for index, pdf_file in enumerate(pdf_fileName):
            print(" route ：%s"%pdf_file)

            #  Read source PDF file 
            input = PdfFileReader(open(pdf_file, "rb"))

            #  Get the source PDF The total number of pages in the file 
            # if index == 4: pageCount = 1
            # else: pageCount = input.getNumPages()

            pageCount = input.getNumPages()
            outputPages += pageCount
            print(" the number of pages ：%d"%pageCount)

            #  Separately page Add to output output in 
            for iPage in range(pageCount):
                output.addPage(input.getPage(iPage))

        print(" Total combined pages :%d."%outputPages)
        #  Write to target PDF file 
        outPath = os.path.join(filepath, outfile)
        if os.path.isfile(outPath) == True:
            print(outPath, "PDF file already exist , Please delete and try again ！")
            return False
        outputStream = open(outPath, "wb")
        output.write(outputStream)
        outputStream.close()
        # print("PDF File merge complete ！")
        return True
    else:
        # print(" There is nothing to merge PDF file ！")
        return False

if __name__ == "__main__":
    file_dir = input(' Please input Pdf Folder : ').replace('/','//')#  Deposit PDF Original folder 
    outfile = "out.pdf" #  Output PDF The name of the document 
    flag = MergePDF(file_dir, outfile)
    
    if flag: print('PDF merger ')
    else: print('PDF Merger failed , Please try again ！')

Usage method

Number sorting , Generate the combined PDF file .