[pylint] removed dunder methods in Python 3 (PLW3201) (#13194)

Co-authored-by: Micha Reiser <micha@reiser.io>

crates/ruff_linter/resources/test/fixtures/pylint/bad_dunder_method_name.py

@@ -94,6 +94,9 @@ def __prepare__():
     def __mro_entries__(self, bases):
         pass
 
+    # Removed with Python 3
+    def __unicode__(self):
+        pass
 
 def __foo_bar__():  # this is not checked by the [bad-dunder-name] rule
     ...

crates/ruff_linter/src/rules/pylint/rules/bad_dunder_method_name.rs

@@ -8,10 +8,10 @@ use crate::checkers::ast::Checker;
 use crate::rules::pylint::helpers::is_known_dunder_method;
 
 /// ## What it does
-/// Checks for misspelled and unknown dunder names in method definitions.
+/// Checks for dunder methods that have no special meaning in Python 3.
 ///
 /// ## Why is this bad?
-/// Misspelled dunder name methods may cause your code to not function
+/// Misspelled or no longer supported dunder name methods may cause your code to not function
 /// as expected.
 ///
 /// Since dunder methods are associated with customizing the behavior
@@ -51,7 +51,7 @@ impl Violation for BadDunderMethodName {
     #[derive_message_formats]
     fn message(&self) -> String {
         let BadDunderMethodName { name } = self;
-        format!("Bad or misspelled dunder method name `{name}`")
+        format!("Dunder method `{name}` has no special meaning in Python 3")
     }
 }
 

crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__PLW3201_bad_dunder_method_name.py.snap

@@ -1,15 +1,15 @@
 ---
 source: crates/ruff_linter/src/rules/pylint/mod.rs
 ---
-bad_dunder_method_name.py:5:9: PLW3201 Bad or misspelled dunder method name `_init_`
+bad_dunder_method_name.py:5:9: PLW3201 Dunder method `_init_` has no special meaning in Python 3
   |
 4 | class Apples:
 5 |     def _init_(self):  # [bad-dunder-name]
   |         ^^^^^^ PLW3201
 6 |         pass
   |
 
-bad_dunder_method_name.py:8:9: PLW3201 Bad or misspelled dunder method name `__hello__`
+bad_dunder_method_name.py:8:9: PLW3201 Dunder method `__hello__` has no special meaning in Python 3
   |
 6 |         pass
 7 | 
@@ -18,7 +18,7 @@ bad_dunder_method_name.py:8:9: PLW3201 Bad or misspelled dunder method name `__h
 9 |         print("hello")
   |
 
-bad_dunder_method_name.py:11:9: PLW3201 Bad or misspelled dunder method name `__init_`
+bad_dunder_method_name.py:11:9: PLW3201 Dunder method `__init_` has no special meaning in Python 3
    |
  9 |         print("hello")
 10 | 
@@ -28,7 +28,7 @@ bad_dunder_method_name.py:11:9: PLW3201 Bad or misspelled dunder method name `__
 13 |         pass
    |
 
-bad_dunder_method_name.py:15:9: PLW3201 Bad or misspelled dunder method name `_init_`
+bad_dunder_method_name.py:15:9: PLW3201 Dunder method `_init_` has no special meaning in Python 3
    |
 13 |         pass
 14 | 
@@ -38,7 +38,7 @@ bad_dunder_method_name.py:15:9: PLW3201 Bad or misspelled dunder method name `_i
 17 |         pass
    |
 
-bad_dunder_method_name.py:19:9: PLW3201 Bad or misspelled dunder method name `___neg__`
+bad_dunder_method_name.py:19:9: PLW3201 Dunder method `___neg__` has no special meaning in Python 3
    |
 17 |         pass
 18 | 
@@ -48,7 +48,7 @@ bad_dunder_method_name.py:19:9: PLW3201 Bad or misspelled dunder method name `__
 21 |         pass
    |
 
-bad_dunder_method_name.py:23:9: PLW3201 Bad or misspelled dunder method name `__inv__`
+bad_dunder_method_name.py:23:9: PLW3201 Dunder method `__inv__` has no special meaning in Python 3
    |
 21 |         pass
 22 | 
@@ -58,4 +58,10 @@ bad_dunder_method_name.py:23:9: PLW3201 Bad or misspelled dunder method name `__
 25 |         pass
    |
 
-
+bad_dunder_method_name.py:98:9: PLW3201 Dunder method `__unicode__` has no special meaning in Python 3
+   |
+97 |     # Removed with Python 3
+98 |     def __unicode__(self):
+   |         ^^^^^^^^^^^ PLW3201
+99 |         pass
+   |