Display an auto-refresh webcam image (PNG) in a tkinter app

tk_webcam.py

from datetime import datetime
import io
import sys
import urllib.request
import tkinter as tk
# sudo apt install python3-pil python3-pil.imagetk
import PIL.Image
import PIL.ImageTk


# some consts
IMG_URL = 'https://www.infoclimat.fr/cartes/getProxyWebcam.php?idw=274&c=30&t=png&70610'


# build tk interface
class MainApp(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        # img container
        self.lbl_img = tk.Label()
        self.lbl_img.pack()
        # start auto-refresh
        self.update_img()

    def update_img(self):
        # log update
        print('%s: update now' % datetime.now().strftime('%Y-%m-%dT%H:%M:%S'))
        # do web request
        try:
            with urllib.request.urlopen(IMG_URL, timeout=10) as u:
                raw_data = u.read()
            # convert bytes RAW PNG data to Pillow (PIL) image and resize it
            pil_img = PIL.Image.open(io.BytesIO(raw_data))
            pil_img.thumbnail([1280, 720])
            # convert PIL image to Tk format
            tk_img = PIL.ImageTk.PhotoImage(pil_img)
            self.lbl_img.configure(image=tk_img)
            # don't remove: keep a ref to avoid del by garbage collect
            self.lbl_img.tk_img=tk_img
        except Exception as err:
            print(err, file=sys.stderr)
        # redo after 30s
        self.after(30000, func=self.update_img)


if __name__ == '__main__':
    app = MainApp()
    app.title('Webcam Fort-Mahon-Plage')
    app.mainloop()