Ejemplo de uso de reloj/cronometro con pysimplegui

.gitignore

+.DS_Store
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reloj.py

+import PySimpleGUI as sg
+import datetime
+import time
+
+layout = [
+    [sg.Text(size=(15,1), key='-OUTPUT-')],      
+    [sg.Exit()]
+    ]      
+
+window = sg.Window('Ventana').layout(layout)      
+
+counter = 0
+
+while True:      
+    event, values = window.read(timeout=10)
+    # acualizar tiempo cada 10 milesimas de segundo
+    window['-OUTPUT-'].update(
+        '{:02d}:{:02d}.{:02d}'.format((counter // 100) // 60, (counter // 100) % 60, counter % 100))
+    counter += 1
+
+    if event is None or event == 'Exit':      
+        break      
+
+window.Close()
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