Example: Internet Speed  Tacker

Prerequisites 
 sudo apt install speedtest-cli 
 internet_speed_tracker.py 
 #!/usr/bin/env python3
import subprocess
import csv
import os
from datetime import datetime

#--------------CONFIGURATIONs--------------
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
LOG_FILE = os.path.join(BASE_DIR, "speed_log.csv")

def run_speed_test():
 try:
 # Run speedtest in simple mode
 result = subprocess.check_output(["speedtest-cli", "--simple"]).decode("utf-8")
 
 # These settings parse the text. For example: Ping: 20 ms, Download: 50.5 Mbit/s, etc
 lines = result.split('\n')
 ping = lines[0].split()[1]
 download = lines[1].split()[1]
 upload = lines[2].split()[1]
 return ping, download, upload
 #These settings keep Speedtest from crashing by logging zeroes when the internet is totally down
 except Exception:
 return "0", "0", "0" 

def main():
 timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
 ping, download, upload = run_speed_test()
 
 # Check if file exists to add headers if it doesn't
 file_exists = os.path.isfile(LOG_FILE)
 
 with open(LOG_FILE, mode='a', newline='') as f:
 writer = csv.writer(f)
 if not file_exists:
 writer.writerow(["Timestamp", "Ping (ms)", "Download (Mbit/s)", "Upload (Mbit/s)"])
 writer.writerow([timestamp, ping, download, upload])

if __name__ == "__main__":
 main() 
 Configure systemd 
 /etc/systemd/system/internet-speed-tracker.service 
 [Service]
ExecStart=/usr/bin/python3 "home/alang/internet_speed_tracker.py"
User=alang 
 /etc/systemd/system/internet-speed-tracker.timer 
 [Timer]
OnBootSec=5min
OnUnitActiveSec=2min
Persistent=true

[Install]
WantedBy=timers.target 
 Start the service 
 sudo systemctl daemon-reload
sudo systemctl enable --now internet-speed-tracker.timer