python3 -m venv /opt/scripts/venv

import subprocess
import datetime

date_str = datetime.datetime.now().strftime("%Y-%m-%d")
filename = f"/backups/db_{date_str}.sql"

cmd = f"mysqldump -u root -p'password' mydb > {filename}"
subprocess.run(cmd, shell=True)

0 3 * * * /opt/scripts/venv/bin/python /opt/scripts/backup.py