Das deutsche Python-Forum

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        pdf = canvas.Canvas(r'/opt/bash/protokoll.pdf')
        pdf.setPageSize((89*mm,40*mm))
        pdf.setFont("Courier-Bold", 8)
        pdf.drawString(10*mm,35*mm,"Auftrag:")
        pdf.drawString(10*mm,30*mm,"Material:")
        pdf.drawString(10*mm,25*mm,"Groesse:")
        pdf.drawString(10*mm,20*mm,"Gewicht:")
        pdf.drawString(10*mm,15*mm,"Kundenartikel:")
        
        pdf.setFont("Courier", 4)
        pdf.drawString(10*mm,3*mm,time.strftime("%d.%m.%Y %H:%M:%S"))
        
        pdf.showPage()            
        pdf.save()
        subprocess.call('lpr -P DYMO_LabelWriter_450', 64, '/opt/bash/protokoll.pdf')

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Traceback (most recent call last):
  File "auftraege.py", line 79, in DruckTest
    subprocess.check_call('lpr -P DYMO_LabelWriter_450',128, '/opt/bash/protokoll.pdf')
  File "/usr/lib/python3.4/subprocess.py", line 556, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/lib/python3.4/subprocess.py", line 537, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/lib/python3.4/subprocess.py", line 859, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.4/subprocess.py", line 1457, in _execute_child
    raise child_exception_type(errno_num, err_msg)
PermissionError: [Errno 13] Keine Berechtigung
pi@raspberrypi:~ $

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subprocess.call(['lpr', '-P', 'DYMO_LabelWriter_450', filename])