Merge multiple PDF files into one file

mergepdfs.py

import os
import sys
from PyPDF2 import PdfFileReader, PdfFileMerger

files_dir = os.path.expanduser("~/pdf")
if not os.path.isdir(files_dir):
    print("ERROR: input directory {} does not exist\n".format(files_dir))
    sys.exit(1)

pdf_files = [f for f in os.listdir(files_dir) if f.endswith("pdf")]
print("found {} pdfs\n".format(len(pdf_files)))
if len(pdf_files) == 0:
    print("ERROR: no PDF files found in {}".format(files_dir))
    sys.exit(1)
merger = PdfFileMerger()

for filename in pdf_files:
    merger.append(PdfFileReader(os.path.join(files_dir, filename), "rb"))

merger.write(os.path.join(files_dir, "merged_full.pdf"))

I found this code at http://www.boxcontrol.net/merge-pdf-files-with-under-10-lines-in-python.html and added it here with some minor modifications. I'm planning to develop it further but for now I like it saved and handy.

I've tested this code with Python 3.4.3 on Windows but expect it to work on any *nix platform as well.