ch25: simple enum metaclasses

25-class-metaprog/evaltime_meta.py

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+from evalsupport import deco_alpha
+from evalsupport import MetaAleph
+
+print('<[1]> evaltime_meta module start')
+
+
+@deco_alpha
+class ClassThree():
+    print('<[2]> ClassThree body')
+
+    def method_y(self):
+        print('<[3]> ClassThree.method_y')
+
+
+class ClassFour(ClassThree):
+    print('<[4]> ClassFour body')
+
+    def method_y(self):
+        print('<[5]> ClassFour.method_y')
+
+
+class ClassFive(metaclass=MetaAleph):
+    print('<[6]> ClassFive body')
+
+    def __init__(self):
+        print('<[7]> ClassFive.__init__')
+
+    def method_z(self):
+        print('<[8]> ClassFive.method_z')
+
+
+class ClassSix(ClassFive):
+    print('<[9]> ClassSix body')
+
+    def method_z(self):
+        print('<[10]> ClassSix.method_z')
+
+
+if __name__ == '__main__':
+    print('<[11]> ClassThree tests', 30 * '.')
+    three = ClassThree()
+    three.method_y()
+    print('<[12]> ClassFour tests', 30 * '.')
+    four = ClassFour()
+    four.method_y()
+    print('<[13]> ClassFive tests', 30 * '.')
+    five = ClassFive()
+    five.method_z()
+    print('<[14]> ClassSix tests', 30 * '.')
+    six = ClassSix()
+    six.method_z()
+
+print('<[15]> evaltime_meta module end')