ch25: simple enum metaclasses

25-class-metaprog/evalsupport.py

@@ -0,0 +1,29 @@
+# tag::BEGINNING[]
+print('<[100]> evalsupport module start')
+
+def deco_alpha(cls):
+    print('<[200]> deco_alpha')
+
+    def inner_1(self):
+        print('<[300]> deco_alpha:inner_1')
+
+    cls.method_y = inner_1
+    return cls
+
+# end::BEGINNING[]
+# tag::META_ALEPH[]
+class MetaAleph(type):
+    print('<[400]> MetaAleph body')
+
+    def __init__(cls, name, bases, dic):
+        print('<[500]> MetaAleph.__init__')
+
+        def inner_2(self):
+            print('<[600]> MetaAleph.__init__:inner_2')
+
+        cls.method_z = inner_2
+
+# end::META_ALEPH[]
+# tag::END[]
+print('<[700]> evalsupport module end')
+# end::END[]