Deprecate is_inside_lambda from utils (#5447)

* Deprecate ``is_inside_lambda`` from utils

* Allow tuple and single type for ``get_node_first_ancestor_of_type``

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

pylint/checkers/refactoring/recommendation_checker.py

@@ -83,7 +83,7 @@ def _check_consider_iterating_dictionary(self, node: nodes.Call) -> None:
             return
         if node.func.attrname != "keys":
             return
-        comp_ancestor = utils.get_node_first_ancestor_of_type(node, (nodes.Compare,))
+        comp_ancestor = utils.get_node_first_ancestor_of_type(node, nodes.Compare)
         if (
             isinstance(node.parent, (nodes.For, nodes.Comprehension))
             or comp_ancestor

pylint/checkers/utils.py

@@ -64,6 +64,7 @@
 import numbers
 import re
 import string
+import warnings
 from functools import lru_cache, partial
 from typing import (
     Callable,
@@ -294,6 +295,11 @@ class InferredTypeError(Exception):
 
 def is_inside_lambda(node: nodes.NodeNG) -> bool:
     """Return whether the given node is inside a lambda"""
+    warnings.warn(
+        "utils.is_inside_lambda will be removed in favour of calling "
+        "utils.get_node_first_ancestor_of_type(x, nodes.Lambda) in pylint 3.0",
+        DeprecationWarning,
+    )
     return any(isinstance(parent, nodes.Lambda) for parent in node.node_ancestors())
 
 
@@ -1696,7 +1702,7 @@ def returns_bool(node: nodes.NodeNG) -> bool:
 
 
 def get_node_first_ancestor_of_type(
-    node: nodes.NodeNG, ancestor_type: Tuple[Type[T_Node]]
+    node: nodes.NodeNG, ancestor_type: Union[Type[T_Node], Tuple[Type[T_Node]]]
 ) -> Optional[T_Node]:
     """Return the first parent node that is any of the provided types (or None)"""
     for ancestor in node.node_ancestors():

pylint/checkers/variables.py

@@ -1159,7 +1159,7 @@ def _check_consumer(
 
         if (
             is_recursive_klass
-            and utils.is_inside_lambda(node)
+            and utils.get_node_first_ancestor_of_type(node, nodes.Lambda)
             and (
                 not utils.is_default_argument(node)
                 or node.scope().parent.scope() is not defframe

tests/checkers/unittest_utils.py

@@ -486,3 +486,10 @@ def test_is_empty_literal() -> None:
     assert utils.is_empty_str_literal(string_node.value)
     not_empty_string_node = astroid.extract_node("a = 'hello'")
     assert not utils.is_empty_str_literal(not_empty_string_node.value)
+
+
+def test_deprecation_is_inside_lambda() -> None:
+    """Test that is_inside_lambda is throwing a DeprecationWarning"""
+    with pytest.warns(DeprecationWarning) as records:
+        utils.is_inside_lambda(nodes.NodeNG())
+        assert len(records) == 1