import tempfile
import svgwrite
import cairosvg
from PyPDF2 import PdfFileWriter, PdfFileReader
import io


draft_pdf_fd, draft_pdf_path = tempfile.mkstemp(suffix='.pdf')
print(draft_pdf_path)

pdf_writer = PdfFileWriter()
unit = svgwrite.Unit("mm")
svg_page = svgwrite.Drawing(size=(unit(297), unit(210)))
_text = svg_page.text('123123', (unit(10), unit(20)))
svg_page.add(_text)
pdf_writer.addPage(PdfFileReader(io.BytesIO(cairosvg.svg2pdf(bytestring=svg_page.tostring()))).getPage(0))

with open(draft_pdf_path, 'ab') as out:
        pdf_writer.write(out)