Fix false-positive for unused-import on class keyword arguments

Author: cdce8p

ChangeLog

@@ -77,6 +77,10 @@ Release date: TBA
 
 * Improve check if class is subscriptable PEP585
 
+* Fix false-positive for ``unused-import`` on class keyword arguments
+
+  Closes #3202
+
 
 What's New in Pylint 2.7.2?
 ===========================

pylint/checkers/variables.py

@@ -976,6 +976,14 @@ def visit_name(self, node):
             ):
                 continue
 
+            # Ignore inner class scope for keywords in class definition
+            if (
+                current_consumer.scope_type == "class"
+                and isinstance(node.parent, astroid.Keyword)
+                and isinstance(node.parent.parent, astroid.ClassDef)
+            ):
+                continue
+
             # if the name node is used as a function default argument's value or as
             # a decorator, then start from the parent frame of the function instead
             # of the function frame - and thus open an inner class scope

tests/functional/u/unused/unused_import_class_def_keyword.py

@@ -0,0 +1,38 @@
+"""
+Test false-positive for unused-import on class keyword arguments
+
+    https://github.com/PyCQA/pylint/issues/3202
+"""
+# pylint: disable=missing-docstring,too-few-public-methods,invalid-name,import-error
+
+# Imports don't exist! Only check `unused-import`
+from const import DOMAIN
+from const import DOMAIN_2
+from const import DOMAIN_3
+
+
+class Child:
+    def __init_subclass__(cls, **kwargs):
+        pass
+
+class Parent(Child, domain=DOMAIN):
+    pass
+
+
+# Alternative 1
+class Parent_2(Child, domain=DOMAIN_2):
+    DOMAIN_2 = DOMAIN_2
+
+
+# Alternative 2
+class A:
+    def __init__(self, arg):
+        pass
+
+class B:
+    CONF = "Hello World"
+    SCHEMA = A(arg=CONF)
+
+
+# Test normal instantiation
+A(arg=DOMAIN_3)