Open a LUKS device with Python 3 script

Here code from a script to unlock a LUKS device before making a backup to the device. I use LUKS for encrypting hard drives for off-site storage.

print ("Determine if luks device mapper link exists. If link exists, then luks is open")
answer = os.path.islink(luks_location)
print ("Result of luks device being open: ", answer)

if answer == False:
    #luks device is closed, attempt to open
    print ("Attempting to open luks device: ", luks_device_uuid)
    subprocess.call("cryptsetup luksOpen " + "--key-file " + repr(luks_keyfile) + " " + repr(luks_device_uuid) + " " + repr(luks_name), shell=True)
    answer = os.path.islink(luks_location)

    # test to see if luksOpen failed and need to exit program
    if answer == False:
        # luksopen failed, exit program
        print ("luks device failed to open. The answer variable is: ", answer)
        sys.exit ("Exiting program now.")
    else:
        # luksopen was successful
        print ("luks device is now open: ", answer)
        print ("luks location is: ", luks_location)
        print ("luks device mapper name is: ", luks_name)

else:
    # luks device was already open
    print ("luks device is already open: ", answer)
    print ("luks location is: ", luks_location)
    print ("luks device mapper name is: ", luks_name)
sys.exit("exiting program")

Next blog will be mounting the device with python.