Make unidiomatic-typecheck check right-hand side too (#10225)

doc/whatsnew/fragments/10217.bugfix

@@ -0,0 +1,3 @@
+Fixed unidiomatic-typecheck only checking left-hand side.
+
+Closes #10217

pylint/checkers/base/comparison_checker.py

@@ -324,6 +324,10 @@ def _check_unidiomatic_typecheck(self, node: nodes.Compare) -> None:
             left = node.left
             if _is_one_arg_pos_call(left):
                 self._check_type_x_is_y(node, left, operator, right)
+            elif isinstance(left, nodes.Name) and _is_one_arg_pos_call(right):
+                self._check_type_x_is_y(
+                    node=node, left=right, operator=operator, right=left
+                )  # transforming Y == type(x) case to type(x) == Y
 
     def _check_type_x_is_y(
         self,

tests/functional/u/unidiomatic_typecheck.py

@@ -6,6 +6,10 @@ def simple_positives():
     type(42) is not int # [unidiomatic-typecheck]
     type(42) == int # [unidiomatic-typecheck]
     type(42) != int # [unidiomatic-typecheck]
+    int is type(42) # [unidiomatic-typecheck]
+    int is not type(42) # [unidiomatic-typecheck]
+    int == type(42) # [unidiomatic-typecheck]
+    int != type(42) # [unidiomatic-typecheck]
 
 def simple_inference_positives():
     alias = type

tests/functional/u/unidiomatic_typecheck.txt

@@ -2,13 +2,17 @@ unidiomatic-typecheck:5:4:5:19:simple_positives:Use isinstance() rather than typ
 unidiomatic-typecheck:6:4:6:23:simple_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
 unidiomatic-typecheck:7:4:7:19:simple_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
 unidiomatic-typecheck:8:4:8:19:simple_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
-unidiomatic-typecheck:12:4:12:20:simple_inference_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
-unidiomatic-typecheck:13:4:13:24:simple_inference_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
-unidiomatic-typecheck:14:4:14:20:simple_inference_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
-unidiomatic-typecheck:15:4:15:20:simple_inference_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
-unidiomatic-typecheck:65:4:65:23:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
-unidiomatic-typecheck:66:4:66:27:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
-unidiomatic-typecheck:67:4:67:23:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
-unidiomatic-typecheck:68:4:68:27:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:9:4:9:19:simple_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:10:4:10:23:simple_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:11:4:11:19:simple_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:12:4:12:19:simple_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:16:4:16:20:simple_inference_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:17:4:17:24:simple_inference_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:18:4:18:20:simple_inference_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:19:4:19:20:simple_inference_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
 unidiomatic-typecheck:69:4:69:23:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
 unidiomatic-typecheck:70:4:70:27:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:71:4:71:23:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:72:4:72:27:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:73:4:73:23:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED
+unidiomatic-typecheck:74:4:74:27:type_of_literals_positives:Use isinstance() rather than type() for a typecheck.:UNDEFINED