ch25: changed MicroEnum to use __class_getitem__

Author: ramalho

25-class-metaprog/tinyenums/microenum.py

@@ -54,12 +54,10 @@ class MicroEnumMeta(type):
     def __prepare__(name, bases, **kwargs):
         return AutoFillDict()
 
-    def __getitem__(cls, key):
+
+class MicroEnum(metaclass=MicroEnumMeta):
+    def __class_getitem__(cls, key):
         for k, v in cls.__dict__.items():
             if v == key:
                 return k
         raise KeyError(key)
-
-
-class MicroEnum(metaclass=MicroEnumMeta):
-    pass

25-class-metaprog/tinyenums/nanoenum.py

@@ -25,7 +25,6 @@
 
 
 class KeyIsValueDict(dict):
-
     def __missing__(self, key):
         if key.startswith('__') and key.endswith('__'):
             raise KeyError(key)