Collections2

# ============================================================================
#  collections2 -- Python (ctypes) port of examples\Vb6\collections2\collections2.bas
#  Like collections, but adds sortable collection fields and per-item field
#  values, then validates the collection.
# ============================================================================
import os
import sys
# the wrapper lives at <root>/wrappers/python (source checkout) or beside
# the example tree (shipped package) -- find it without a hard-coded path
_d = os.path.dirname(os.path.abspath(__file__))
for _ in range(6):
    for _c in (os.path.join(_d, 'wrappers', 'python'), _d):
        if os.path.isfile(os.path.join(_c, 'lumaspdf.py')):
            sys.path.insert(0, _c)
            break
    else:
        _d = os.path.dirname(_d)
        continue
    break
import lumaspdf as L

HERE = os.path.dirname(os.path.abspath(__file__))
TEST = os.path.join(HERE, "..", "..", "test_files")


@L.TErrorProc
def err_proc(data, errcode, errmsg, errtype):
    if errmsg:
        print(errmsg.decode("latin-1", "replace"))
    return 0  # try to continue on error


def main():
    pdf = L.pdfNewPDF()
    L.pdfCreateNewPDFA(pdf, b"")  # output file opened later
    L.pdfSetOnErrorProc(pdf, 0, err_proc)

    cover = os.path.join(TEST, "collection_en.pdf")
    L.pdfSetImportFlags(pdf, L.ifImportAll | L.ifImportAsPage)
    if L.pdfOpenImportFileA(pdf, cover.encode("latin-1"), L.ptOpen, b"") < 0:
        L.pdfDeletePDF(pdf)
        print('Input file "' + cover + '" not found!')
        return
    L.pdfImportPDFFile(pdf, 1, 1.0, 1.0)
    L.pdfCloseImportFile(pdf)
    L.pdfCreateCollection(pdf, L.civTile)

    # A user defined field 'Index' so the list can be sorted in any order.
    ef = L.pdfCreateCollectionFieldA(pdf, L.cisCustomNumber, 0, b"File index", b"Index", 0, 1)
    L.pdfSetColSortField(pdf, ef, 1)

    L.pdfCreateCollectionFieldA(pdf, L.cisFileName, 1, b"File name", b"", 1, 1)
    L.pdfCreateCollectionFieldA(pdf, L.cisSize, 2, b"File size", b"", 1, 0)
    L.pdfCreateCollectionFieldA(pdf, L.cisModDate, 3, b"Modification date", b"", 1, 0)

    ef = L.pdfAttachFileA(pdf, os.path.join(TEST, "taxform.pdf").encode("latin-1"), b"A PDF file...", 1)
    L.pdfSetColDefFile(pdf, ef)  # opened when viewing in Acrobat 8 or later
    L.pdfCreateColItemNumber(pdf, ef, b"Index", 0.0, b"")

    ef = L.pdfAttachFileA(pdf, os.path.join(TEST, "fulltest.emf").encode("latin-1"), b"An EMF file...", 1)
    L.pdfCreateColItemNumber(pdf, ef, b"Index", 1.0, b"")

    ef = L.pdfAttachFileA(pdf, os.path.join(TEST, "sample.txt").encode("latin-1"), b"A text file...", 1)
    L.pdfCreateColItemNumber(pdf, ef, b"Index", 2.0, b"")

    # Let's check whether the collection is valid.
    L.pdfCheckCollection(pdf)

    out_file = os.path.join(HERE, "out.pdf")
    if L.pdfHaveOpenDoc(pdf) != 0:
        if L.pdfOpenOutputFileA(pdf, out_file.encode("latin-1")) == 0:
            L.pdfDeletePDF(pdf)
            return
    L.pdfCloseFile(pdf)
    print('PDF Collection "' + out_file + '" successfully created!')
    L.pdfDeletePDF(pdf)


if __name__ == "__main__":
    main()

This file is in the SDK at examples/python/collections2/collections2.py. The build fails if this page and that file ever differ.