Autocad DWG version read using python3

dwgver.py

#!/usr/bin/env python

# http://vislab-ccom.unh.edu/~schwehr/rt/python-binary-files.html
# https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/drawing-version-codes-for-autocad.html
# MC0.0 - DWG Release 1.1 
# AC1.2 - DWG Release 1.2 
# AC1.4 - DWG Release 1.4 
# AC1.50 - DWG Release 2.0 
# AC2.10 - DWG Release 2.10 
# AC1002 - DWG Release 2.5 
# AC1003 - DWG Release 2.6 
# AC1004 - DWG Release 9 
# AC1006 - DWG Release 10 
# AC1009 - DWG Release 11/12 (LT R1/R2) 
# AC1012 - DWG Release 13 (LT95) 
# AC1014 - DWG Release 14, 14.01 (LT97/LT98) 
# AC1015 - DWG AutoCAD 2000/2000i/2002 
# AC1018 - DWG AutoCAD 2004/2005/2006 
# AC1021 - DWG AutoCAD 2007/2008/2009 
# AC1024 - DWG AutoCAD 2010/2011/2012 
# AC1027 - DWG AutoCAD 2013/2014/2015/2016/2017 
# AC1032 - DWG AutoCAD 2018

import binascii, sys

def findDWGVersion(filename):
    with open(filename, "rb") as binary_file:
        # Read the whole file at once
        data = binary_file.read()
        # Seek position and read N bytes
        binary_file.seek(0)  # Go to beginning
        couple_bytes = binary_file.read(6)
        version_string = couple_bytes.decode('UTF-8')
        return version_string

def main(argv):
    print(findDWGVersion("file.dwg"))

if __name__== "__main__":
  main(sys.argv[1:])