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class Full: drink: str

Python will happily run the above code and we can access the “variants” under the Glass namespace.

lemonade = Glass.Full('lemonade')
-

If only we could register the variants as the Glass type itself and inherit all its methods.

Redecorate

We can define a decorator that takes all of the nested dataclasses and makes them inherit the outer class.

import inspect
-
-def AlgebraicEnum(cls):
-    for subclass_name, subclass in inspect.getmembers(cls, predicate=inspect.isclass):
-        if subclass_name != "__class__":
-            setattr(cls, subclass_name, type(subclass_name, (cls, subclass), {}))
+

If only we could register the variants as the Glass type itself and inherit all its methods.

Redecorate

We can define a decorator that takes all of the nested dataclasses and makes them inherit the outer class.

def AlgebraicEnum(cls):
+    for name, nested in cls.__dict__.items():
+        if isinstance(nested, type):
+            setattr(cls, name, type(name, (cls, nested), {}))
 
     return cls

The inheritance means all methods of the outer class are available on the nested @@ -158,14 +156,13 @@ compare it with Glass.Empty and Glass.Full.

Thes print(diet_coke.report_drink()) print(empty.is_empty()) -

import inspect
-from dataclasses import dataclass
+
from dataclasses import dataclass
 
 
 def AlgebraicEnum(cls):
-    for subclass_name, subclass in inspect.getmembers(cls, predicate=inspect.isclass):
-        if subclass_name != "__class__":
-            setattr(cls, subclass_name, type(subclass_name, (cls, subclass), {}))
+    for name, nested in cls.__dict__.items():
+        if isinstance(nested, type):
+            setattr(cls, name, type(name, (cls, nested), {}))
 
     return cls