handle Attribute

Author: clavedeluna

doc/whatsnew/fragments/7821.bugfix

@@ -0,0 +1,3 @@
+Fixes bug that resulted in crash during ``unnecessary_list_index_lookup`` check.
+
+Closes #7821

pylint/checkers/refactoring/refactoring_checker.py

@@ -2303,7 +2303,7 @@ def _enumerate_with_start(
     def _get_start_value(self, node: nodes.NodeNG) -> tuple[int | None, Confidence]:
         confidence = HIGH
 
-        if isinstance(node, (nodes.Name, nodes.Call)):
+        if isinstance(node, (nodes.Name, nodes.Call, nodes.Attribute)):
             inferred = utils.safe_infer(node)
             start_val = inferred.value if inferred else None
             confidence = INFERENCE

tests/functional/u/unnecessary/unnecessary_list_index_lookup.py

@@ -138,3 +138,9 @@ def return_start(start):
 
 for idx, val in enumerate():
     print(my_list[idx])
+
+class Command:
+    def _get_extra_attrs(self, extra_columns):
+        self.extra_rows_start = 8  # pylint: disable=attribute-defined-outside-init
+        for index, column in enumerate(extra_columns, start=self.extra_rows_start):
+            pass