updade from Atlas repo

25-class-metaprog/evaltime/evaldemo.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+from builderlib import Builder, deco, Descriptor
+
+print('# evaldemo module start')
+
+@deco  # <1>
+class Klass(Builder):  # <2>
+    print('# Klass body')
+
+    attr = Descriptor()  # <3>
+
+    def __init__(self):
+        super().__init__()
+        print(f'# Klass.__init__({self!r})')
+
+    def __repr__(self):
+        return '<Klass instance>'
+
+
+def main():  # <4>
+    obj = Klass()
+    obj.method_a()
+    obj.method_b()
+    obj.attr = 999
+
+if __name__ == '__main__':
+    main()
+
+print('# evaldemo module end')