How do I print a document 2 pages on a sheet using python?

[x-yuri]

What I do:

import uno
from com.sun.star.view.PaperOrientation import PORTRAIT as PAPER_ORIENTATION_PORTRAIT
from com.sun.star.view.PaperOrientation import LANDSCAPE as PAPER_ORIENTATION_LANDSCAPE
from com.sun.star.view.PaperFormat import A4 as PAPER_FORMAT_A4
from com.sun.star.view.DuplexMode import OFF as DUPLEX_MODE_OFF
from com.sun.star.view.DuplexMode import LONGEDGE as DUPLEX_MODE_LONGEDGE
from com.sun.star.view.DuplexMode import SHORTEDGE as DUPLEX_MODE_SHORTEDGE
from com.sun.star.beans import PropertyValue

printer = 'Canon MF650C Series UFR II(1)'

def print():
    doc = XSCRIPTCONTEXT.getDocument()
    doc.Printer = mkpvseq({
        'Name': printer,
        'PaperOrientation': PAPER_ORIENTATION_PORTRAIT,
        'PaperFormat': PAPER_FORMAT_A4,
    })
    doc.PagePrintSettings = mkpvseq({
        'PageColumns': 2,
        'PageRows': 1,
        'IsLandscape': True,
    })
    doc.printPages(mkpvseq({
        'CopyCount': 1,
        'Pages': '',
        'DuplexMode': DUPLEX_MODE_OFF,
        'PrinterName': printer,
    }))

def mkpvseq(props):
    pvs = []
    for n, v in props.items():
        pv = PropertyValue()
        pv.Name = n
        pv.Value = v
        pvs.append(pv)
    return tuple(pvs)

g_exportedScripts = print,

Basically printing works, but in this particular case it prints 2 pages on different sides of a sheet. How do I make it print 2 pages on one side of a sheet? What can I check? Any suggestions?