Revert "Check __setattr__ when property is not settable (#9196)" (#9474)

This reverts commit 3186281.

Co-authored-by: hauntsaninja <>

Author: hauntsaninja

mypy/checkmember.py

@@ -553,8 +553,7 @@ def analyze_var(name: str,
             return mx.chk.handle_partial_var_type(typ, mx.is_lvalue, var, mx.context)
         if mx.is_lvalue and var.is_property and not var.is_settable_property:
             # TODO allow setting attributes in subclass (although it is probably an error)
-            if info.get('__setattr__') is None:
-                mx.msg.read_only_property(name, itype.type, mx.context)
+            mx.msg.read_only_property(name, itype.type, mx.context)
         if mx.is_lvalue and var.is_classvar:
             mx.msg.cant_assign_to_classvar(name, mx.context)
         t = get_proper_type(expand_type_by_instance(typ, itype))
@@ -564,8 +563,7 @@ def analyze_var(name: str,
             if mx.is_lvalue:
                 if var.is_property:
                     if not var.is_settable_property:
-                        if info.get('__setattr__') is None:
-                            mx.msg.read_only_property(name, itype.type, mx.context)
+                        mx.msg.read_only_property(name, itype.type, mx.context)
                 else:
                     mx.msg.cant_assign_to_method(mx.context)
 

mypy/test/testcheck.py

@@ -90,7 +90,6 @@
     'check-reports.test',
     'check-errorcodes.test',
     'check-annotated.test',
-    'check-setattr.test',
     'check-parameter-specification.test',
 ]