Use type(ctx) instead of ctx.__class__

Author: alexmojaki

pandas/core/computation/expr.py

@@ -637,7 +637,7 @@ def visit_Attribute(self, node, **kwargs):
                     return resolved
                 raise
 
-        raise ValueError(f"Invalid Attribute context {ctx.__class__.__name__}")
+        raise ValueError(f"Invalid Attribute context {type(ctx).__name__}")
 
     def visit_Call(self, node, side=None, **kwargs):