From 7b0bc1986eb0f4ec620677914327345b63864b00 Mon Sep 17 00:00:00 2001
From: Mark Byrne <31762852+mbyrnepr2@users.noreply.github.com>
Date: Sat, 12 Nov 2022 22:23:28 +0100
Subject: [PATCH] Fix a crash when looking up an __init__ method (#7744)
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* Fix a crash when a child class with an ``__init__`` method inherits from a parent class with an ``__init__`` class attribute.

* `continue` if not a method.

* Update pylint/checkers/classes/class_checker.py

* Rename fragment

Closes #7742

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>
Co-authored-by: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
---
 doc/whatsnew/fragments/7742.bugfix       |  3 +++
 pylint/checkers/classes/class_checker.py |  6 ++++--
 tests/functional/i/init_not_called.py    | 11 +++++++++++
 3 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 doc/whatsnew/fragments/7742.bugfix

diff --git a/doc/whatsnew/fragments/7742.bugfix b/doc/whatsnew/fragments/7742.bugfix
new file mode 100644
index 0000000000..7e3c930899
--- /dev/null
+++ b/doc/whatsnew/fragments/7742.bugfix
@@ -0,0 +1,3 @@
+Fix a crash when a child class with an ``__init__`` method inherits from a parent class with an ``__init__`` class attribute.
+
+Closes #7742
diff --git a/pylint/checkers/classes/class_checker.py b/pylint/checkers/classes/class_checker.py
index 3bfef75490..eb157187e2 100644
--- a/pylint/checkers/classes/class_checker.py
+++ b/pylint/checkers/classes/class_checker.py
@@ -2224,7 +2224,7 @@ def _is_mandatory_method_param(self, node: nodes.NodeNG) -> bool:
 
 
 def _ancestors_to_call(
-    klass_node: nodes.ClassDef, method: str = "__init__"
+    klass_node: nodes.ClassDef, method_name: str = "__init__"
 ) -> dict[nodes.ClassDef, bases.UnboundMethod]:
     """Return a dictionary where keys are the list of base classes providing
     the queried method, and so that should/may be called from the method node.
@@ -2232,7 +2232,9 @@ def _ancestors_to_call(
     to_call: dict[nodes.ClassDef, bases.UnboundMethod] = {}
     for base_node in klass_node.ancestors(recurs=False):
         try:
-            init_node: bases.UnboundMethod = next(base_node.igetattr(method))
+            init_node = next(base_node.igetattr(method_name))
+            if not isinstance(init_node, astroid.UnboundMethod):
+                continue
             if init_node.is_abstract():
                 continue
             to_call[base_node] = init_node
diff --git a/tests/functional/i/init_not_called.py b/tests/functional/i/init_not_called.py
index c310ae8369..ee8c4f5a1f 100644
--- a/tests/functional/i/init_not_called.py
+++ b/tests/functional/i/init_not_called.py
@@ -84,3 +84,14 @@ def __init__(self, num: float):
 
     def __init__(self, num):
         super().__init__(round(num))
+
+
+# https://github.com/PyCQA/pylint/issues/7742
+# Crash when parent class has a class attribute named `__init__`
+class NoInitMethod:
+    __init__ = 42
+
+
+class ChildNoInitMethod(NoInitMethod):
+    def __init__(self):
+        ...