Startup-script doesn't work with python file

Hi all,
I’m trying to create startup script in Compute Engine - in directly way when create VM instance, I want to run command just like in SSH command line. Here my startup script:

#!/bin/bash
sudo python3 /home/minhngc4795/test.py

Here is my test.py file, I want to write line “test” to test.txt file in folder:

#!/usr/bin/python3
file = open("test.txt","w")
file.write("test")
file.close()

When I start VM instance and check /var/log/syslog, it doesn’t return error code or anything, just return 0

Sep  7 10:18:18 startupscript systemd[1]: Starting Google Compute Engine Startup Scripts...
Sep  7 10:18:18 startupscript startup-script: INFO Starting startup scripts.
Sep  7 10:18:18 startupscript startup-script: INFO Found startup-script in metadata.
Sep  7 10:18:18 startupscript startup-script: INFO startup-script: Return code 0.
Sep  7 10:18:18 startupscript startup-script: INFO Finished running startup scripts.

But nothing happens in my folder. I try to figure it out but nothing come up. Pls help me, thks a lot. I’m using Ubuntu 16.04.5 LTS

[ghost]

Thks all for helping. It worked.

[gut]

Great! Have fun then.