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liteyuki_flow/typ.py

@@ -0,0 +1,20 @@
+"""
+Module docs
+"""
+from typing import TypeAlias
+
+
+class Nil():
+    def __eq__(self, other):
+        if isinstance(other, Nil):
+            return True
+        return other is None
+
+    # 不等于
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+
+nil = Nil()
+
+err: TypeAlias = Exception | Nil