harurunrunrun

# if you have not finished to install PyPDF2, please execute "pip install PyPDF2" or "{your python.exe path} -m pip install PyPDF2" 
import PyPDF2

pdf_files=["A.pdf","B.pdf","C.pdf"] # write merged pdf files path in order
pdf_name="D.pdf" # write new pdf file path (you canNOT write the path in pdf_files)

mem=PyPDF2.PdfFileMerger()

for pdf_file in pdf_files:
  mem.append(pdf_file)