E-Paper Status Display on Pi Zero with a Waveshare 2.13 inch HAT

#!/usr/bin/env python3
"""Show Pi Zero status on a Waveshare 2.13 inch e-paper HAT."""
import os
import socket
import subprocess
import sys
import time
from datetime import datetime

# Make the Waveshare library importable from the cloned repository
sys.path.append(os.path.expanduser('~/e-Paper/RaspberryPi_JetsonNano/python/lib'))
from waveshare_epd import epd2in13_V4 as epd_driver  # match your board revision
from PIL import Image, ImageDraw, ImageFont

REFRESH_S = 300  # 5 minutes; frequent full refreshes shorten panel life
FONT_PATH = '/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf'

def load_font(size):
    try:
        return ImageFont.truetype(FONT_PATH, size)
    except OSError:
        return ImageFont.load_default()  # fallback if the font is missing

BIG, SMALL = load_font(20), load_font(14)

def ip_address():
    # hostname -I lists all addresses; take the first one
    out = subprocess.run(['hostname', '-I'], capture_output=True, text=True).stdout.split()
    return out[0] if out else 'no network'

def cpu_temp():
    with open('/sys/class/thermal/thermal_zone0/temp') as f:
        return int(f.read()) / 1000

def draw_status(epd):
    # Landscape canvas: width = epd.height (250), height = epd.width (122)
    image = Image.new('1', (epd.height, epd.width), 255)  # 255 = white
    draw = ImageDraw.Draw(image)
    draw.text((4, 2), socket.gethostname(), font=BIG, fill=0)
    draw.line((0, 28, epd.height, 28), fill=0, width=2)
    draw.text((4, 34), f'IP:   {ip_address()}', font=SMALL, fill=0)
    draw.text((4, 54), f'CPU:  {cpu_temp():.1f} C', font=SMALL, fill=0)
    draw.text((4, 74), f'Load: {os.getloadavg()[0]:.2f}', font=SMALL, fill=0)
    draw.text((4, 100), datetime.now().strftime('Updated %d %b %H:%M'), font=SMALL, fill=0)
    return image

def main():
    epd = epd_driver.EPD()
    try:
        while True:
            epd.init()                         # wake the panel
            epd.display(epd.getbuffer(draw_status(epd)))
            epd.sleep()                        # low-power mode; image stays visible
            time.sleep(REFRESH_S)
    except KeyboardInterrupt:
        pass
    finally:
        epd_driver.epdconfig.module_exit(cleanup=True)  # release SPI and GPIO

if __name__ == '__main__':
    main()