Respect type overrides in E721

crates/ruff/resources/test/fixtures/pycodestyle/E721.py

@@ -54,3 +54,7 @@
     pass
 
 assert type(res) == type(None)
+
+types = StrEnum
+if x == types.X:
+    pass

crates/ruff/src/checkers/ast/mod.rs

@@ -3186,11 +3186,7 @@ where
                 }
 
                 if self.settings.rules.enabled(Rule::TypeComparison) {
-                    self.diagnostics.extend(pycodestyle::rules::type_comparison(
-                        ops,
-                        comparators,
-                        Range::from(expr),
-                    ));
+                    pycodestyle::rules::type_comparison(self, expr, ops, comparators);
                 }
 
                 if self.settings.rules.enabled(Rule::SysVersionCmpStr3)

crates/ruff/src/rules/pycodestyle/rules/type_comparison.rs

@@ -1,6 +1,7 @@
 use itertools::izip;
 use rustpython_parser::ast::{Cmpop, Constant, Expr, ExprKind};
 
+use crate::checkers::ast::Checker;
 use ruff_diagnostics::{Diagnostic, Violation};
 use ruff_macros::{derive_message_formats, violation};
 use ruff_python_ast::types::Range;
@@ -34,18 +35,16 @@ impl Violation for TypeComparison {
 }
 
 /// E721
-pub fn type_comparison(ops: &[Cmpop], comparators: &[Expr], location: Range) -> Vec<Diagnostic> {
-    let mut diagnostics: Vec<Diagnostic> = vec![];
-
+pub fn type_comparison(checker: &mut Checker, expr: &Expr, ops: &[Cmpop], comparators: &[Expr]) {
     for (op, right) in izip!(ops, comparators) {
         if !matches!(op, Cmpop::Is | Cmpop::IsNot | Cmpop::Eq | Cmpop::NotEq) {
             continue;
         }
         match &right.node {
             ExprKind::Call { func, args, .. } => {
                 if let ExprKind::Name { id, .. } = &func.node {
-                    // Ex) type(False)
-                    if id == "type" {
+                    // Ex) `type(False)`
+                    if id == "type" && checker.ctx.is_builtin("type") {
                         if let Some(arg) = args.first() {
                             // Allow comparison for types which are not obvious.
                             if !matches!(
@@ -56,23 +55,32 @@ pub fn type_comparison(ops: &[Cmpop], comparators: &[Expr], location: Range) ->
                                         kind: None
                                     }
                             ) {
-                                diagnostics.push(Diagnostic::new(TypeComparison, location));
+                                checker
+                                    .diagnostics
+                                    .push(Diagnostic::new(TypeComparison, Range::from(expr)));
                             }
                         }
                     }
                 }
             }
             ExprKind::Attribute { value, .. } => {
                 if let ExprKind::Name { id, .. } = &value.node {
-                    // Ex) types.IntType
-                    if id == "types" {
-                        diagnostics.push(Diagnostic::new(TypeComparison, location));
+                    // Ex) `types.NoneType`
+                    if id == "types"
+                        && checker
+                            .ctx
+                            .resolve_call_path(value)
+                            .map_or(false, |call_path| {
+                                call_path.first().map_or(false, |module| *module == "types")
+                            })
+                    {
+                        checker
+                            .diagnostics
+                            .push(Diagnostic::new(TypeComparison, Range::from(expr)));
                     }
                 }
             }
             _ => {}
         }
     }
-
-    diagnostics
 }