Automatically Log CPU, RAM, and Disk Usage Every Minute in Python

import psutil
import time
import csv
from pathlib import Path

LOG_FILE = Path("system_usage_log.csv")
INTERVAL_SECONDS = 60

def log_system_usage():
    """Write CPU, RAM, and disk usage to CSV every minute."""
    file_exists = LOG_FILE.exists()
    with open(LOG_FILE, mode="a", newline="") as f:
        writer = csv.writer(f)
        if not file_exists:
            writer.writerow(["Timestamp", "CPU%", "RAM%", "Disk%"])

        while True:
            timestamp = time.strftime("%Y-%m-%d %H:%M:%S")
            cpu = psutil.cpu_percent(interval=1)
            ram = psutil.virtual_memory().percent
            disk = psutil.disk_usage("/").percent
            writer.writerow([timestamp, cpu, ram, disk])
            f.flush()
            time.sleep(INTERVAL_SECONDS - 1)  # adjust for 1s cpu sampling

if __name__ == "__main__":
    print(f"Logging system usage every {INTERVAL_SECONDS} seconds to {LOG_FILE}...")
    print("Press Ctrl+C to stop.")
    try:
        log_system_usage()
    except KeyboardInterrupt:
        print("\nLogging stopped.")