Why is there an error when running the script?

Question

Python

There is an application - let it be a simple echo bot for a cart.
threw on the server in a virtual environment. I launch from the console - everything perfectly works. I configure systemd - it does not start.
I dug into the logs and found that it does not start because it does not find the certificate file for the webhook. All files are nearby.
I conducted experiments, as a result:
1) if you go to the folder with the script and start the virtual environment first, and then "python app.py" - it works
2) if you go to the folder with the script and run the command "bin / python app.py" - works
3) if you go to the folder above and run the command "bot/bin/python bot/app.py" - it does not start, it does not find the certificate file specified in the script.
Exactly the same thing happens with systemd.

ExecStart=/home/me/venvs/bot/bin/python /home/me/venvs/bot/app.py

I realized that the script is being launched from another folder - that's why the file cannot be found.
I tried to specify the cert file in the script as "crt.pem" and as "os.path.abspath('cert.prm')" - still does not want to start.
Actually the question is how to work with files, if the launch occurs from where?

Answer 1

Try setting working directory https://unix.stackexchange.com/a/200657