manual duplex printing chunk generate

main.py

import os.path

from PyPDF2 import PdfFileReader, PdfFileWriter

# chunk_size, path = sys.argv[1], sys.argv[2]
chunk_size, path = 50, '/home/serg/print/auto/fluent.pdf'  # '/home/serg/Documents/sicp.pdf'
pdf = PdfFileReader(str(path))
cnt = pdf.getNumPages()

ranges = [range(i, i+chunk_size) for i in range(0, cnt, chunk_size)]
print(ranges)
if cnt % chunk_size != 0:
    ranges[-1] = range(ranges[-1].start, ranges[-1].start + cnt % chunk_size)
print(ranges)

remove_last_page_warning = False
chunked = []
for chunk in ranges:
    chunked.append(range(chunk.start, chunk.stop, 2))
    chunked.append(range(chunk.stop-1, chunk.start, -2))
if cnt % chunk_size % 2:
    remove_last_page_warning = True
    chunked[-1] = range(chunked[-1].start-1, chunked[-1].stop, chunked[-1].step)
print(chunked)


path_dir, filename = os.path.dirname(path), os.path.basename(path)[:-4]
print(path_dir, filename)

for i, chunk in enumerate(chunked):
    if i == len(chunked) - 1 and remove_last_page_warning:
        saved_chunk = f'{i}-REMOVE-LAST-PAGE-{filename}-{chunk.start}-{chunk.stop}.pdf'
    else:
        saved_chunk = f'{i}-{filename}-{chunk.start}-{chunk.stop}.pdf'

    pdf_writer = PdfFileWriter()
    with open(os.path.join(path_dir, 'dumped'+filename, saved_chunk), 'wb') as output_file:
    # with Path().open(mode="w") as output_file:
        for p in chunk:
            pdf_writer.addPage(pdf.getPage(p))
        pdf_writer.write(output_file)