updade from Atlas repo

25-class-metaprog/setattr/example_from_leo.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+class Foo:
+    @property
+    def bar(self):
+        return self._bar
+
+    @bar.setter
+    def bar(self, value):
+        self._bar = value
+
+    def __setattr__(self, name, value):
+        print(f'setting {name!r} to {value!r}')
+        super().__setattr__(name, value)
+
+o = Foo()
+o.bar = 8
+print(o.bar)
+print(o._bar)