#pdf_merger.py

import glob
from PyPDF2 import PdfFileMerger

def merger(output_path, imput_paths):
    pdf_merger = PdfFileMerger()
    file_handles = []

    for path in input_paths:
        pdf_merger.append(path)

    with open(ouput_path, 'wb') as fileobj:
        pdf_merger.write(fileobj)

paths = glob.glob('MU3_*.pdf')
paths.sort()
merger('pdf_merger2.pdf', paths)