pylint-dev · Pierre-Sassoulas · Nov 6, 2022 · Nov 6, 2022
diff --git a/.pyenchant_pylint_custom_dict.txt b/.pyenchant_pylint_custom_dict.txt
@@ -31,6 +31,7 @@ bla
 bom
 bool
 boolean
+booleaness
 boolop
 boundmethod
 builtins
@@ -106,6 +107,7 @@ epytext
 erroring
 etree
 expr
+falsey
 favour
 filepath
 filestream
@@ -326,6 +328,7 @@ toplevel
 towncrier
 tp
 truthness
+truthey
 tryexcept
 txt
 typecheck

diff --git a/pylint/checkers/refactoring/implicit_booleaness_checker.py b/pylint/checkers/refactoring/implicit_booleaness_checker.py
@@ -9,6 +9,7 @@
 
 from pylint import checkers
 from pylint.checkers import utils
+from pylint.interfaces import HIGH, INFERENCE
 
 
 class ImplicitBooleanessChecker(checkers.BaseChecker):
@@ -99,7 +100,11 @@ def visit_call(self, node: nodes.Call) -> None:
         )
         if isinstance(len_arg, generator_or_comprehension):
             # The node is a generator or comprehension as in len([x for x in ...])
-            self.add_message("use-implicit-booleaness-not-len", node=node)
+            self.add_message(
+                "use-implicit-booleaness-not-len",
+                node=node,
+                confidence=HIGH,
+            )
             return
         try:
             instance = next(len_arg.infer())
@@ -113,7 +118,11 @@ def visit_call(self, node: nodes.Call) -> None:
         if "range" in mother_classes or (
             affected_by_pep8 and not self.instance_has_bool(instance)
         ):
-            self.add_message("use-implicit-booleaness-not-len", node=node)
+            self.add_message(
+                "use-implicit-booleaness-not-len",
+                node=node,
+                confidence=INFERENCE,
+            )
 
     @staticmethod
     def instance_has_bool(class_def: nodes.ClassDef) -> bool:
@@ -134,7 +143,9 @@ def visit_unaryop(self, node: nodes.UnaryOp) -> None:
             and node.op == "not"
             and utils.is_call_of_name(node.operand, "len")
         ):
-            self.add_message("use-implicit-booleaness-not-len", node=node)
+            self.add_message(
+                "use-implicit-booleaness-not-len", node=node, confidence=HIGH
+            )
 
     @utils.only_required_for_messages("use-implicit-booleaness-not-comparison")
     def visit_compare(self, node: nodes.Compare) -> None:
@@ -177,35 +188,33 @@ def _check_use_implicit_booleaness_not_comparison(
 
                 # No need to check for operator when visiting compare node
                 if operator in {"==", "!=", ">=", ">", "<=", "<"}:
-                    collection_literal = "{}"
-                    if isinstance(literal_node, nodes.List):
-                        collection_literal = "[]"
-                    if isinstance(literal_node, nodes.Tuple):
-                        collection_literal = "()"
-
-                    instance_name = "x"
-                    if isinstance(target_node, nodes.Call) and target_node.func:
-                        instance_name = f"{target_node.func.as_string()}(...)"
-                    elif isinstance(target_node, (nodes.Attribute, nodes.Name)):
-                        instance_name = target_node.as_string()
-
-                    original_comparison = (
-                        f"{instance_name} {operator} {collection_literal}"
-                    )
-                    suggestion = (
-                        f"{instance_name}"
-                        if operator == "!="
-                        else f"not {instance_name}"
-                    )
                     self.add_message(
                         "use-implicit-booleaness-not-comparison",
-                        args=(
-                            original_comparison,
-                            suggestion,
+                        args=self._implicit_booleaness_message_args(
+                            literal_node, operator, target_node
                         ),
                         node=node,
+                        confidence=HIGH,
                     )
 
+    def _implicit_booleaness_message_args(
+        self, literal_node: nodes.NodeNG, operator: str, target_node: nodes.NodeNG
+    ) -> tuple[str, str]:
+        """Helper to get the right message for "use-implicit-booleaness-not-comparison"."""
+        collection_literal = "{}"
+        if isinstance(literal_node, nodes.List):
+            collection_literal = "[]"
+        if isinstance(literal_node, nodes.Tuple):
+            collection_literal = "()"
+        instance_name = "x"
+        if isinstance(target_node, nodes.Call) and target_node.func:
+            instance_name = f"{target_node.func.as_string()}(...)"
+        elif isinstance(target_node, (nodes.Attribute, nodes.Name)):
+            instance_name = target_node.as_string()
+        original_comparison = f"{instance_name} {operator} {collection_literal}"
+        suggestion = f"{instance_name}" if operator == "!=" else f"not {instance_name}"
+        return original_comparison, suggestion
+
     @staticmethod
     def base_names_of_instance(node: bases.Uninferable | bases.Instance) -> list[str]:
         """Return all names inherited by a class instance or those returned by a

diff --git a/pylint/extensions/comparetozero.py b/pylint/extensions/comparetozero.py
@@ -14,6 +14,7 @@
 
 from pylint import checkers
 from pylint.checkers import utils
+from pylint.interfaces import HIGH
 
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
@@ -70,7 +71,7 @@ def visit_compare(self, node: nodes.Compare) -> None:
                 error_detected = True
 
             if error_detected:
-                self.add_message("compare-to-zero", node=node)
+                self.add_message("compare-to-zero", node=node, confidence=HIGH)
 
 
 def register(linter: PyLinter) -> None:

diff --git a/pylint/extensions/emptystring.py b/pylint/extensions/emptystring.py
@@ -13,6 +13,7 @@
 
 from pylint import checkers
 from pylint.checkers import utils
+from pylint.interfaces import HIGH
 
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
@@ -64,7 +65,7 @@ def visit_compare(self, node: nodes.Compare) -> None:
                 error_detected = True
 
             if error_detected:
-                self.add_message("compare-to-empty-string", node=node)
+                self.add_message("compare-to-empty-string", node=node, confidence=HIGH)
 
 
 def register(linter: PyLinter) -> None:

diff --git a/tests/functional/ext/comparetozero/comparetozero.txt b/tests/functional/ext/comparetozero/comparetozero.txt
@@ -1,4 +1,4 @@
-compare-to-zero:6:3:6:9::Avoid comparisons to zero:UNDEFINED
-compare-to-zero:9:3:9:13::Avoid comparisons to zero:UNDEFINED
-compare-to-zero:12:3:12:9::Avoid comparisons to zero:UNDEFINED
-compare-to-zero:15:3:15:9::Avoid comparisons to zero:UNDEFINED
+compare-to-zero:6:3:6:9::Avoid comparisons to zero:HIGH
+compare-to-zero:9:3:9:13::Avoid comparisons to zero:HIGH
+compare-to-zero:12:3:12:9::Avoid comparisons to zero:HIGH
+compare-to-zero:15:3:15:9::Avoid comparisons to zero:HIGH
diff --git a/tests/functional/ext/emptystring/empty_string_comparison.txt b/tests/functional/ext/emptystring/empty_string_comparison.txt
@@ -1,4 +1,4 @@
-compare-to-empty-string:6:3:6:10::Avoid comparisons to empty string:UNDEFINED
-compare-to-empty-string:9:3:9:14::Avoid comparisons to empty string:UNDEFINED
-compare-to-empty-string:12:3:12:10::Avoid comparisons to empty string:UNDEFINED
-compare-to-empty-string:15:3:15:10::Avoid comparisons to empty string:UNDEFINED
+compare-to-empty-string:6:3:6:10::Avoid comparisons to empty string:HIGH
+compare-to-empty-string:9:3:9:14::Avoid comparisons to empty string:HIGH
+compare-to-empty-string:12:3:12:10::Avoid comparisons to empty string:HIGH
+compare-to-empty-string:15:3:15:10::Avoid comparisons to empty string:HIGH
diff --git a/tests/functional/u/use/use_implicit_booleaness_not_comparison.txt b/tests/functional/u/use/use_implicit_booleaness_not_comparison.txt
@@ -1,32 +1,32 @@
-use-implicit-booleaness-not-comparison:14:7:14:21:github_issue_4774:'bad_list == []' can be simplified to 'not bad_list' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:22:3:22:20::'empty_tuple == ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:25:3:25:19::'empty_list == []' can be simplified to 'not empty_list' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:28:3:28:19::'empty_dict == {}' can be simplified to 'not empty_dict' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:31:3:31:20::'empty_tuple == ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:34:3:34:19::'empty_list == []' can be simplified to 'not empty_list' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:37:3:37:19::'empty_dict == {}' can be simplified to 'not empty_dict' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:42:11:42:18:bad_tuple_return:'t == ()' can be simplified to 'not t' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:46:11:46:18:bad_list_return:'b == []' can be simplified to 'not b' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:50:11:50:18:bad_dict_return:'c == {}' can be simplified to 'not c' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:52:7:52:24::'empty_tuple == ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:53:7:53:23::'empty_list == []' can be simplified to 'not empty_list' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:54:7:54:23::'empty_dict != {}' can be simplified to 'empty_dict' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:55:7:55:23::'empty_tuple < ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:56:7:56:23::'empty_list <= []' can be simplified to 'not empty_list' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:57:7:57:23::'empty_tuple > ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:58:7:58:23::'empty_list >= []' can be simplified to 'not empty_list' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:83:3:83:10::'a == []' can be simplified to 'not a' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:95:3:95:10::'e == []' can be simplified to 'not e' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:95:15:95:22::'f == {}' can be simplified to 'not f' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:133:3:133:14::'A.lst == []' can be simplified to 'not A.lst' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:137:3:137:14::'A.lst == []' can be simplified to 'not A.lst' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:141:3:141:20::'A.test(...) == []' can be simplified to 'not A.test(...)' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:149:3:149:24::'test_function(...) == []' can be simplified to 'not test_function(...)' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:156:3:156:20::'numpy_array == []' can be simplified to 'not numpy_array' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:158:3:158:20::'numpy_array != []' can be simplified to 'numpy_array' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:160:3:160:20::'numpy_array >= ()' can be simplified to 'not numpy_array' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:185:3:185:13::'data == {}' can be simplified to 'not data' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:187:3:187:13::'data != {}' can be simplified to 'data' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:195:3:195:26::'long_test == {}' can be simplified to 'not long_test' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:233:11:233:41:test_func:'my_class.parent_function == {}' can be simplified to 'not my_class.parent_function' as an empty sequence is falsey:UNDEFINED
-use-implicit-booleaness-not-comparison:234:11:234:37:test_func:'my_class.my_property == {}' can be simplified to 'not my_class.my_property' as an empty sequence is falsey:UNDEFINED
+use-implicit-booleaness-not-comparison:14:7:14:21:github_issue_4774:'bad_list == []' can be simplified to 'not bad_list' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:22:3:22:20::'empty_tuple == ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:25:3:25:19::'empty_list == []' can be simplified to 'not empty_list' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:28:3:28:19::'empty_dict == {}' can be simplified to 'not empty_dict' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:31:3:31:20::'empty_tuple == ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:34:3:34:19::'empty_list == []' can be simplified to 'not empty_list' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:37:3:37:19::'empty_dict == {}' can be simplified to 'not empty_dict' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:42:11:42:18:bad_tuple_return:'t == ()' can be simplified to 'not t' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:46:11:46:18:bad_list_return:'b == []' can be simplified to 'not b' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:50:11:50:18:bad_dict_return:'c == {}' can be simplified to 'not c' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:52:7:52:24::'empty_tuple == ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:53:7:53:23::'empty_list == []' can be simplified to 'not empty_list' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:54:7:54:23::'empty_dict != {}' can be simplified to 'empty_dict' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:55:7:55:23::'empty_tuple < ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:56:7:56:23::'empty_list <= []' can be simplified to 'not empty_list' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:57:7:57:23::'empty_tuple > ()' can be simplified to 'not empty_tuple' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:58:7:58:23::'empty_list >= []' can be simplified to 'not empty_list' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:83:3:83:10::'a == []' can be simplified to 'not a' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:95:3:95:10::'e == []' can be simplified to 'not e' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:95:15:95:22::'f == {}' can be simplified to 'not f' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:133:3:133:14::'A.lst == []' can be simplified to 'not A.lst' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:137:3:137:14::'A.lst == []' can be simplified to 'not A.lst' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:141:3:141:20::'A.test(...) == []' can be simplified to 'not A.test(...)' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:149:3:149:24::'test_function(...) == []' can be simplified to 'not test_function(...)' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:156:3:156:20::'numpy_array == []' can be simplified to 'not numpy_array' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:158:3:158:20::'numpy_array != []' can be simplified to 'numpy_array' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:160:3:160:20::'numpy_array >= ()' can be simplified to 'not numpy_array' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:185:3:185:13::'data == {}' can be simplified to 'not data' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:187:3:187:13::'data != {}' can be simplified to 'data' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:195:3:195:26::'long_test == {}' can be simplified to 'not long_test' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:233:11:233:41:test_func:'my_class.parent_function == {}' can be simplified to 'not my_class.parent_function' as an empty sequence is falsey:HIGH
+use-implicit-booleaness-not-comparison:234:11:234:37:test_func:'my_class.my_property == {}' can be simplified to 'not my_class.my_property' as an empty sequence is falsey:HIGH