fix typing issue

heracles-ec · Jan 2, 2024 · 8c691f8 · 8c691f8
1 parent 4da8064
commit 8c691f8
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/heracles/fields.py b/heracles/fields.py
@@ -69,9 +69,9 @@ def __init_subclass__(cls, *, spin: int | None = None) -> None:
         if spin is not None:
             cls.__spin = spin
         uses = cls.uses
-        if cls.uses is None:
+        if uses is None:
             uses = ()
-        elif isinstance(cls.uses, str):
+        elif isinstance(uses, str):
             uses = (uses,)
         ncol = len(uses)
         nopt = 0