Super Simple 2-windows in 25 lines of code

DemoPrograms/Demo_Multiple_Windows_read_all_windows_25_lines.py

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+#!/usr/bin/env python
+"""
+    Demo - Multiple read_all_window(timeout=20)
+        A 2-window event loop run in async mode
+
+    Super-simple, 25 lines of code.
+
+    Copyright 2021 PySimpleGUI
+"""
+
+import PySimpleGUI as sg
+
+sg.set_options(font='_ 18')
+
+window1 = sg.Window('ONE', [[sg.T('Window 1',size=(30,1),k='-T-')],[sg.B('Run', k='-B-'), sg.B('Exit')]],
+                    finalize=True)
+
+window2 = sg.Window('TWO', [[sg.T('Window 2',k='-T-')],[sg.B('Run', k='-B-'),sg.B('Exit')]], finalize=True,
+                    location=(window1.current_location()[0]-250,window1.current_location()[1]))
+
+i, paused = 0, [False, False]
+
+while True:             # Event Loop
+    window, event, values = sg.read_all_windows(timeout=10)
+    print(window, event, values) if event != sg.TIMEOUT_EVENT else None
+    if window == sg.WIN_CLOSED and event == sg.WIN_CLOSED:
+        window1.close()
+        window2.close()
+        sg.popup_auto_close('Exiting...')
+        break
+    if event in (sg.WINDOW_CLOSED, 'Exit'):
+        window.close()
+    if not paused[0]:
+        window1['-T-'].update('{:02d}:{:02d}.{:02d}'.format((i // 100) // 60, (i // 100) % 60, i % 100))
+    if not paused[1]:
+        window2['-T-'].update('{:02d}:{:02d}.{:02d}'.format((i // 100) // 60, (i // 100) % 60, i % 100))
+    if event == '-B-':
+        paused[0 if window == window1 else 1] = not paused[0 if window == window1 else 1]
+        window['-B-'].update('Run' if not paused[0 if window == window1 else 1] else 'Pause')
+    i += 1