Update examples

examples/python/loop-child.py

@@ -26,8 +26,12 @@ def on_leave_loop(loop, tp, mainloop):
 
 
 class Trial(Psy.Trial):
-    def do_enter(self, tp):
-        print(Trial.do_enter)
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+
+    def do_on_enter(self, tp):
+        """Chain up the virtual function, further this function does nothing"""
+        Psy.Trial.do_on_enter(self, tp)
 
     def do_activate(self, tp):
         loop = self.props.parent

examples/python/timers.py

@@ -0,0 +1,43 @@
+import gi
+import os
+import time as t
+
+gi.require_version("Psy", "0.1")
+gi.require_version("GLib", "2.0")
+
+# The next two line may generate warnings, ignore them ;-)
+from gi.repository import Psy, GLib
+import psy_operators
+
+wait_dur = Psy.Duration.new_ms(100)
+clock = Psy.Clock()
+
+
+class MyTimer(Psy.Timer):
+    def __init__(self, loop: GLib.MainLoop, Max: int, **kwargs):
+        super().__init__(**kwargs)
+        self.connect("fired", self.on_fired)
+        self.loop = loop
+        self.max = Max
+        self.n = 0
+        self.old_now = t.time()
+
+    def on_fired(self, _self, tp):
+        """Callback registered in init"""
+        assert self is _self
+        now = t.time()
+        print(f"{self.n}: dur = {now - self.old_now} seconds")
+        self.old_now = now
+        self.props.fire_time = tp + wait_dur
+        self.n += 1
+        if self.n >= self.max:
+            self.loop.quit()
+
+
+event_loop = GLib.MainLoop()
+
+now = clock.now()
+mt = MyTimer(event_loop, 10)
+mt.props.fire_time = now + wait_dur
+
+event_loop.run()