Merge pull request #58 from rooterkyberian/more_implicit_cls_methods

add __class_getitem__ as implicit class method

Author: cooperlees

bugbear.py

@@ -560,7 +560,7 @@ def visit(self, node):
     message="B902 Invalid first argument {} used for {} method. Use the "
     "canonical first argument name in methods, i.e. {}."
 )
-B902.implicit_classmethods = {"__new__", "__init_subclass__"}
+B902.implicit_classmethods = {"__new__", "__init_subclass__", "__class_getitem__"}
 B902.self = ["self"]  # it's a list because the first is preferred
 B902.cls = ["cls", "klass"]  # ditto.
 B902.metacls = ["metacls", "metaclass", "typ", "mcs"]  # ditto.

tests/b902.py

@@ -90,3 +90,13 @@ class RuntimeError("This is not a base"):
     def __init__(self):
         ...
 
+
+class ImplicitClassMethods:
+    def __new__(cls, *args, **kwargs):
+        ...
+
+    def __init_subclass__(cls, *args, **kwargs):
+        ...
+
+    def __class_getitem__(cls, key):
+        ...