[flake8-pyi] Implement PYI025 (#4791)

crates/ruff/resources/test/fixtures/flake8_pyi/PYI025.py

@@ -0,0 +1,19 @@
+from collections.abc import Set as AbstractSet  # Ok
+
+
+from collections.abc import Set  # Ok
+
+
+from collections.abc import (
+    Container,
+    Sized,
+    Set,  # Ok
+    ValuesView
+)
+
+from collections.abc import (
+    Container,
+    Sized,
+    Set as AbstractSet,  # Ok
+    ValuesView
+)

crates/ruff/resources/test/fixtures/flake8_pyi/PYI025.pyi

@@ -0,0 +1,19 @@
+from collections.abc import Set as AbstractSet  # Ok
+
+
+from collections.abc import Set  # PYI025
+
+
+from collections.abc import (
+    Container,
+    Sized,
+    Set,  # PYI025
+    ValuesView
+)
+
+from collections.abc import (
+    Container,
+    Sized,
+    Set as AbstractSet,
+    ValuesView # Ok
+)

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

@@ -1021,12 +1021,14 @@ where
                     }
                 }
             }
-            Stmt::ImportFrom(ast::StmtImportFrom {
-                names,
-                module,
-                level,
-                range: _,
-            }) => {
+            Stmt::ImportFrom(
+                import_from @ ast::StmtImportFrom {
+                    names,
+                    module,
+                    level,
+                    range: _,
+                },
+            ) => {
                 let module = module.as_deref();
                 let level = level.map(|level| level.to_u32());
                 if self.enabled(Rule::ModuleImportNotAtTopOfFile) {
@@ -1091,6 +1093,11 @@ where
                     }
                 }
 
+                if self.is_stub {
+                    if self.enabled(Rule::UnaliasedCollectionsAbcSetImport) {
+                        flake8_pyi::rules::unaliased_collections_abc_set_import(self, import_from);
+                    }
+                }
                 for alias in names {
                     if let Some("__future__") = module {
                         let name = alias.asname.as_ref().unwrap_or(&alias.name);

crates/ruff/src/codes.rs

@@ -593,6 +593,7 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
         (Flake8Pyi, "020") => (RuleGroup::Unspecified, Rule::QuotedAnnotationInStub),
         (Flake8Pyi, "021") => (RuleGroup::Unspecified, Rule::DocstringInStub),
         (Flake8Pyi, "024") => (RuleGroup::Unspecified, Rule::CollectionsNamedTuple),
+        (Flake8Pyi, "025") => (RuleGroup::Unspecified, Rule::UnaliasedCollectionsAbcSetImport),
         (Flake8Pyi, "032") => (RuleGroup::Unspecified, Rule::AnyEqNeAnnotation),
         (Flake8Pyi, "033") => (RuleGroup::Unspecified, Rule::TypeCommentInStub),
         (Flake8Pyi, "042") => (RuleGroup::Unspecified, Rule::SnakeCaseTypeAlias),

crates/ruff/src/registry.rs

@@ -529,6 +529,7 @@ ruff_macros::register_rules!(
     rules::flake8_pyi::rules::TSuffixedTypeAlias,
     rules::flake8_pyi::rules::TypeCommentInStub,
     rules::flake8_pyi::rules::TypedArgumentDefaultInStub,
+    rules::flake8_pyi::rules::UnaliasedCollectionsAbcSetImport,
     rules::flake8_pyi::rules::UnannotatedAssignmentInStub,
     rules::flake8_pyi::rules::UnprefixedTypeParam,
     rules::flake8_pyi::rules::UnrecognizedPlatformCheck,

crates/ruff/src/rules/flake8_pyi/mod.rs

@@ -48,6 +48,8 @@ mod tests {
     #[test_case(Rule::TypeCommentInStub, Path::new("PYI033.pyi"))]
     #[test_case(Rule::TypedArgumentDefaultInStub, Path::new("PYI011.py"))]
     #[test_case(Rule::TypedArgumentDefaultInStub, Path::new("PYI011.pyi"))]
+    #[test_case(Rule::UnaliasedCollectionsAbcSetImport, Path::new("PYI025.py"))]
+    #[test_case(Rule::UnaliasedCollectionsAbcSetImport, Path::new("PYI025.pyi"))]
     #[test_case(Rule::UnannotatedAssignmentInStub, Path::new("PYI052.py"))]
     #[test_case(Rule::UnannotatedAssignmentInStub, Path::new("PYI052.pyi"))]
     #[test_case(Rule::UnprefixedTypeParam, Path::new("PYI001.py"))]

crates/ruff/src/rules/flake8_pyi/rules/mod.rs

@@ -28,6 +28,9 @@ pub(crate) use type_alias_naming::{
     snake_case_type_alias, t_suffixed_type_alias, SnakeCaseTypeAlias, TSuffixedTypeAlias,
 };
 pub(crate) use type_comment_in_stub::{type_comment_in_stub, TypeCommentInStub};
+pub(crate) use unaliased_collections_abc_set_import::{
+    unaliased_collections_abc_set_import, UnaliasedCollectionsAbcSetImport,
+};
 pub(crate) use unrecognized_platform::{
     unrecognized_platform, UnrecognizedPlatformCheck, UnrecognizedPlatformName,
 };
@@ -48,4 +51,5 @@ mod simple_defaults;
 mod stub_body_multiple_statements;
 mod type_alias_naming;
 mod type_comment_in_stub;
+mod unaliased_collections_abc_set_import;
 mod unrecognized_platform;

crates/ruff/src/rules/flake8_pyi/rules/unaliased_collections_abc_set_import.rs

@@ -0,0 +1,62 @@
+use rustpython_parser::ast::StmtImportFrom;
+
+use ruff_diagnostics::{Diagnostic, Violation};
+use ruff_macros::{derive_message_formats, violation};
+
+use crate::checkers::ast::Checker;
+
+/// ## What it does
+/// Checks for `from collections.abc import Set` imports that do not alias
+/// `Set` to `AbstractSet`.
+///
+/// ## Why is this bad?
+/// The `Set` type in `collections.abc` is an abstract base class for set-like types.
+/// It is easily confused with, and not equivalent to, the `set` builtin.
+///
+/// To avoid confusion, `Set` should be aliased to `AbstractSet` when imported. This
+/// makes it clear that the imported type is an abstract base class, and not the
+/// `set` builtin.
+///
+/// ## Example
+/// ```python
+/// from collections.abc import Set
+/// ```
+///
+/// Use instead:
+/// ```python
+/// from collections.abc import Set as AbstractSet
+/// ```
+#[violation]
+pub struct UnaliasedCollectionsAbcSetImport;
+
+impl Violation for UnaliasedCollectionsAbcSetImport {
+    #[derive_message_formats]
+    fn message(&self) -> String {
+        format!(
+            "Use `from collections.abc import Set as AbstractSet` to avoid confusion with the `set` builtin"
+        )
+    }
+
+    fn autofix_title(&self) -> Option<String> {
+        Some(format!("Alias `Set` to `AbstractSet`"))
+    }
+}
+
+/// PYI025
+pub(crate) fn unaliased_collections_abc_set_import(checker: &mut Checker, stmt: &StmtImportFrom) {
+    let Some(module_id) = &stmt.module else {
+        return;
+    };
+    if module_id.as_str() != "collections.abc" {
+        return;
+    }
+
+    for name in &stmt.names {
+        if name.name.as_str() == "Set" && name.asname.is_none() {
+            checker.diagnostics.push(Diagnostic::new(
+                UnaliasedCollectionsAbcSetImport,
+                name.range,
+            ));
+        }
+    }
+}

crates/ruff/src/rules/flake8_pyi/snapshots/ruff__rules__flake8_pyi__tests__PYI025_PYI025.py.snap

@@ -0,0 +1,4 @@
+---
+source: crates/ruff/src/rules/flake8_pyi/mod.rs
+---
+

crates/ruff/src/rules/flake8_pyi/snapshots/ruff__rules__flake8_pyi__tests__PYI025_PYI025.pyi.snap

@@ -0,0 +1,22 @@
+---
+source: crates/ruff/src/rules/flake8_pyi/mod.rs
+---
+PYI025.pyi:4:29: PYI025 Use `from collections.abc import Set as AbstractSet` to avoid confusion with the `set` builtin
+  |
+4 | from collections.abc import Set  # PYI025
+  |                             ^^^ PYI025
+  |
+  = help: Alias `Set` to `AbstractSet`
+
+PYI025.pyi:10:5: PYI025 Use `from collections.abc import Set as AbstractSet` to avoid confusion with the `set` builtin
+   |
+10 |     Container,
+11 |     Sized,
+12 |     Set,  # PYI025
+   |     ^^^ PYI025
+13 |     ValuesView
+14 | )
+   |
+   = help: Alias `Set` to `AbstractSet`
+
+