Build a Terminal Dashboard That Displays Real-Time System Performance in Python

import os, time, sys
from collections import deque

def get_cpu_temp():
    try:
        with open("/sys/class/thermal/thermal_zone0/temp") as f:
            return round(int(f.read().strip()) / 1000, 1)
    except:
        return None

def get_mem_usage():
    with open("/proc/meminfo") as f:
        lines = f.readlines()
        total = int(lines[0].split()[1])
        free = int(lines[1].split()[1])
        buffers = int(lines[3].split()[1])
        cached = int(lines[4].split()[1])
        used = total - free - buffers - cached
        return used, total

def get_cpu_usage(history):
    with open("/proc/stat") as f:
        cpu_line = f.readline().split()
        idle = int(cpu_line[4])
        total = sum(int(v) for v in cpu_line[1:])
    if history:
        prev_idle, prev_total = history[-1]
        delta_idle = idle - prev_idle
        delta_total = total - prev_total
        usage = 100.0 * (1 - delta_idle / delta_total) if delta_total else 0
    else:
        usage = 0
    history.append((idle, total))
    return usage

def draw_dashboard(cpu_pct, mem_used, mem_total, cpu_temp, bar_width=30):
    os.system('clear')
    mem_pct = int(100 * mem_used / mem_total)
    used_bar = '█' * int(mem_pct * bar_width / 100)
    free_bar = '░' * (bar_width - len(used_bar))
    cpu_bar = '█' * int(cpu_pct * bar_width / 100)
    cpu_empty = '░' * (bar_width - len(cpu_bar))
    temp_str = f"{cpu_temp}°C" if cpu_temp is not None else "N/A"
    print(f"CPU: [{cpu_bar}{cpu_empty}] {cpu_pct:.1f}%  Temp: {temp_str}")
    print(f"MEM: [{used_bar}{free_bar}] {mem_pct}% ({mem_used//1024}MB / {mem_total//1024}MB)")
    print(f"Time: {time.strftime('%H:%M:%S')}")

def main():
    cpu_history = deque(maxlen=2)
    try:
        while True:
            cpu_pct = get_cpu_usage(cpu_history)
            mem_used, mem_total = get_mem_usage()
            cpu_temp = get_cpu_temp()
            draw_dashboard(cpu_pct, mem_used, mem_total, cpu_temp)
            time.sleep(2)
    except KeyboardInterrupt:
        print("\nDashboard closed.")

if __name__ == "__main__":
    main()