RustPython · youknowone · Jul 3, 2025 · Jul 2, 2025
diff --git a/Lib/test/test_genericalias.py b/Lib/test/test_genericalias.py
@@ -85,8 +85,6 @@ class BaseTest(unittest.TestCase):
     if ctypes is not None:
         generic_types.extend((ctypes.Array, ctypes.LibraryLoader))
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_subscriptable(self):
         for t in self.generic_types:
             if t is None:
@@ -314,8 +312,6 @@ def test_dir(self):
         for generic_alias_property in ("__origin__", "__args__", "__parameters__"):
             self.assertIn(generic_alias_property, dir_of_gen_alias)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_weakref(self):
         for t in self.generic_types:
             if t is None:

diff --git a/stdlib/src/array.rs b/stdlib/src/array.rs
@@ -44,8 +44,8 @@ mod array {
             AsObject, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
             atomic_func,
             builtins::{
-                PositionIterInternal, PyByteArray, PyBytes, PyBytesRef, PyDictRef, PyFloat, PyInt,
-                PyList, PyListRef, PyStr, PyStrRef, PyTupleRef, PyTypeRef,
+                PositionIterInternal, PyByteArray, PyBytes, PyBytesRef, PyDictRef, PyFloat,
+                PyGenericAlias, PyInt, PyList, PyListRef, PyStr, PyStrRef, PyTupleRef, PyTypeRef,
             },
             class_or_notimplemented,
             convert::{ToPyObject, ToPyResult, TryFromBorrowedObject, TryFromObject},
@@ -1195,6 +1195,15 @@ mod array {
 
             false
         }
+
+        #[pyclassmethod]
+        fn __class_getitem__(
+            cls: PyTypeRef,
+            args: PyObjectRef,
+            vm: &VirtualMachine,
+        ) -> PyGenericAlias {
+            PyGenericAlias::from_args(cls, args, vm)
+        }
     }
 
     impl Comparable for PyArray {

diff --git a/stdlib/src/contextvars.rs b/stdlib/src/contextvars.rs
@@ -24,7 +24,7 @@ thread_local! {
 mod _contextvars {
     use crate::vm::{
         AsObject, Py, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine, atomic_func,
-        builtins::{PyStrRef, PyTypeRef},
+        builtins::{PyGenericAlias, PyStrRef, PyTypeRef},
         class::StaticType,
         common::hash::PyHash,
         function::{ArgCallable, FuncArgs, OptionalArg},
@@ -478,11 +478,11 @@ mod _contextvars {
 
         #[pyclassmethod]
         fn __class_getitem__(
-            _cls: PyTypeRef,
-            _key: PyStrRef,
-            _vm: &VirtualMachine,
-        ) -> PyResult<()> {
-            unimplemented!("ContextVar.__class_getitem__() is currently under construction")
+            cls: PyTypeRef,
+            args: PyObjectRef,
+            vm: &VirtualMachine,
+        ) -> PyGenericAlias {
+            PyGenericAlias::from_args(cls, args, vm)
         }
     }
 
@@ -571,6 +571,15 @@ mod _contextvars {
                 None => ContextTokenMissing::static_type().to_owned().into(),
             }
         }
+
+        #[pyclassmethod]
+        fn __class_getitem__(
+            cls: PyTypeRef,
+            args: PyObjectRef,
+            vm: &VirtualMachine,
+        ) -> PyGenericAlias {
+            PyGenericAlias::from_args(cls, args, vm)
+        }
     }
 
     impl Constructor for ContextToken {

diff --git a/vm/src/builtins/bytearray.rs b/vm/src/builtins/bytearray.rs
@@ -1,7 +1,7 @@
 //! Implementation of the python bytearray object.
 use super::{
-    PositionIterInternal, PyBytes, PyBytesRef, PyDictRef, PyIntRef, PyStrRef, PyTuple, PyTupleRef,
-    PyType, PyTypeRef,
+    PositionIterInternal, PyBytes, PyBytesRef, PyDictRef, PyGenericAlias, PyIntRef, PyStrRef,
+    PyTuple, PyTupleRef, PyType, PyTypeRef,
 };
 use crate::{
     AsObject, Context, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, TryFromObject,
@@ -571,6 +571,11 @@ impl PyByteArray {
     fn reverse(&self) {
         self.borrow_buf_mut().reverse();
     }
+
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
 }
 
 #[pyclass]

diff --git a/vm/src/builtins/bytes.rs b/vm/src/builtins/bytes.rs
@@ -1,5 +1,6 @@
 use super::{
-    PositionIterInternal, PyDictRef, PyIntRef, PyStrRef, PyTuple, PyTupleRef, PyType, PyTypeRef,
+    PositionIterInternal, PyDictRef, PyGenericAlias, PyIntRef, PyStrRef, PyTuple, PyTupleRef,
+    PyType, PyTypeRef,
 };
 use crate::{
     AsObject, Context, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult,
@@ -481,6 +482,11 @@ impl PyBytes {
         let param: Vec<PyObjectRef> = self.elements().map(|x| x.to_pyobject(vm)).collect();
         PyTuple::new_ref(param, &vm.ctx)
     }
+
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
 }
 
 #[pyclass]

diff --git a/vm/src/builtins/classmethod.rs b/vm/src/builtins/classmethod.rs
@@ -1,4 +1,4 @@
-use super::{PyBoundMethod, PyStr, PyType, PyTypeRef};
+use super::{PyBoundMethod, PyGenericAlias, PyStr, PyType, PyTypeRef};
 use crate::{
     AsObject, Context, Py, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
     class::PyClassImpl,
@@ -170,6 +170,11 @@ impl PyClassMethod {
             .set_attr("__isabstractmethod__", value, vm)?;
         Ok(())
     }
+
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
 }
 
 impl Representable for PyClassMethod {

diff --git a/vm/src/builtins/coroutine.rs b/vm/src/builtins/coroutine.rs
@@ -1,4 +1,4 @@
-use super::{PyCode, PyStrRef, PyType};
+use super::{PyCode, PyGenericAlias, PyStrRef, PyType, PyTypeRef};
 use crate::{
     AsObject, Context, Py, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
     class::PyClassImpl,
@@ -72,6 +72,11 @@ impl PyCoroutine {
     fn cr_origin(&self, _vm: &VirtualMachine) -> Option<(PyStrRef, usize, PyStrRef)> {
         None
     }
+
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
 }
 
 #[pyclass]

diff --git a/vm/src/builtins/generator.rs b/vm/src/builtins/generator.rs
@@ -2,7 +2,7 @@
  * The mythical generator.
  */
 
-use super::{PyCode, PyStrRef, PyType};
+use super::{PyCode, PyGenericAlias, PyStrRef, PyType, PyTypeRef};
 use crate::{
     AsObject, Context, Py, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
     class::PyClassImpl,
@@ -67,6 +67,11 @@ impl PyGenerator {
     fn gi_yieldfrom(&self, _vm: &VirtualMachine) -> Option<PyObjectRef> {
         self.inner.frame().yield_from_target()
     }
+
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
 }
 
 #[pyclass]

diff --git a/vm/src/builtins/memory.rs b/vm/src/builtins/memory.rs
@@ -1,6 +1,6 @@
 use super::{
-    PositionIterInternal, PyBytes, PyBytesRef, PyInt, PyListRef, PySlice, PyStr, PyStrRef, PyTuple,
-    PyTupleRef, PyType, PyTypeRef,
+    PositionIterInternal, PyBytes, PyBytesRef, PyGenericAlias, PyInt, PyListRef, PySlice, PyStr,
+    PyStrRef, PyTuple, PyTupleRef, PyType, PyTypeRef,
 };
 use crate::{
     AsObject, Context, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult,
@@ -550,6 +550,11 @@ impl Py<PyMemoryView> {
     Representable
 ))]
 impl PyMemoryView {
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
+
     #[pymethod]
     pub fn release(&self) {
         if self.released.compare_exchange(false, true).is_ok() {

diff --git a/vm/src/builtins/range.rs b/vm/src/builtins/range.rs
@@ -1,5 +1,6 @@
 use super::{
-    PyInt, PyIntRef, PySlice, PyTupleRef, PyType, PyTypeRef, builtins_iter, tuple::tuple_hash,
+    PyGenericAlias, PyInt, PyIntRef, PySlice, PyTupleRef, PyType, PyTypeRef, builtins_iter,
+    tuple::tuple_hash,
 };
 use crate::{
     AsObject, Context, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, TryFromObject,
@@ -183,6 +184,11 @@ pub fn init(context: &Context) {
     Representable
 ))]
 impl PyRange {
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
+
     fn new(cls: PyTypeRef, stop: ArgIndex, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
         PyRange {
             start: vm.ctx.new_pyref(0),

diff --git a/vm/src/builtins/slice.rs b/vm/src/builtins/slice.rs
@@ -1,6 +1,6 @@
 // sliceobject.{h,c} in CPython
 // spell-checker:ignore sliceobject
-use super::{PyStrRef, PyTupleRef, PyType, PyTypeRef};
+use super::{PyGenericAlias, PyStrRef, PyTupleRef, PyType, PyTypeRef};
 use crate::{
     AsObject, Context, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
     class::PyClassImpl,
@@ -30,6 +30,11 @@ impl PyPayload for PySlice {
 
 #[pyclass(with(Comparable, Representable, Hashable))]
 impl PySlice {
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
+
     #[pygetset]
     fn start(&self, vm: &VirtualMachine) -> PyObjectRef {
         self.start.clone().to_pyobject(vm)

diff --git a/vm/src/builtins/staticmethod.rs b/vm/src/builtins/staticmethod.rs
@@ -1,4 +1,4 @@
-use super::{PyStr, PyType, PyTypeRef};
+use super::{PyGenericAlias, PyStr, PyType, PyTypeRef};
 use crate::{
     Context, Py, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
     class::PyClassImpl,
@@ -131,6 +131,11 @@ impl PyStaticMethod {
             .set_attr("__isabstractmethod__", value, vm)?;
         Ok(())
     }
+
+    #[pyclassmethod]
+    fn __class_getitem__(cls: PyTypeRef, args: PyObjectRef, vm: &VirtualMachine) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
 }
 
 impl Callable for PyStaticMethod {

diff --git a/vm/src/builtins/union.rs b/vm/src/builtins/union.rs
@@ -2,7 +2,7 @@ use super::{genericalias, type_};
 use crate::{
     AsObject, Context, Py, PyObject, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
     atomic_func,
-    builtins::{PyFrozenSet, PyStr, PyTuple, PyTupleRef, PyType},
+    builtins::{PyFrozenSet, PyGenericAlias, PyStr, PyTuple, PyTupleRef, PyType},
     class::PyClassImpl,
     common::hash,
     convert::{ToPyObject, ToPyResult},
@@ -140,6 +140,15 @@ impl PyUnion {
     fn __or__(zelf: PyObjectRef, other: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
         type_::or_(zelf, other, vm)
     }
+
+    #[pyclassmethod]
+    fn __class_getitem__(
+        cls: crate::builtins::PyTypeRef,
+        args: PyObjectRef,
+        vm: &VirtualMachine,
+    ) -> PyGenericAlias {
+        PyGenericAlias::from_args(cls, args, vm)
+    }
 }
 
 pub fn is_unionable(obj: PyObjectRef, vm: &VirtualMachine) -> bool {

diff --git a/vm/src/exceptions.rs b/vm/src/exceptions.rs
@@ -1203,7 +1203,8 @@ pub(super) mod types {
     use crate::{
         AsObject, PyObjectRef, PyRef, PyResult, VirtualMachine,
         builtins::{
-            PyInt, PyStrRef, PyTupleRef, PyTypeRef, traceback::PyTracebackRef, tuple::IntoPyTuple,
+            PyGenericAlias, PyInt, PyStrRef, PyTupleRef, PyTypeRef, traceback::PyTracebackRef,
+            tuple::IntoPyTuple,
         },
         convert::ToPyResult,
         function::{ArgBytesLike, FuncArgs},
@@ -1234,10 +1235,22 @@ pub(super) mod types {
     #[derive(Debug)]
     pub struct PySystemExit {}
 
-    #[pyexception(name, base = "PyBaseException", ctx = "base_exception_group", impl)]
+    #[pyexception(name, base = "PyBaseException", ctx = "base_exception_group")]
     #[derive(Debug)]
     pub struct PyBaseExceptionGroup {}
 
+    #[pyexception]
+    impl PyBaseExceptionGroup {
+        #[pyclassmethod]
+        fn __class_getitem__(
+            cls: PyTypeRef,
+            args: PyObjectRef,
+            vm: &VirtualMachine,
+        ) -> PyGenericAlias {
+            PyGenericAlias::from_args(cls, args, vm)
+        }
+    }
+
     #[pyexception(name, base = "PyBaseExceptionGroup", ctx = "exception_group", impl)]
     #[derive(Debug)]
     pub struct PyExceptionGroup {}

diff --git a/vm/src/stdlib/functools.rs b/vm/src/stdlib/functools.rs
@@ -4,7 +4,7 @@ pub(crate) use _functools::make_module;
 mod _functools {
     use crate::{
         Py, PyObjectRef, PyPayload, PyRef, PyResult, VirtualMachine,
-        builtins::{PyDict, PyTuple, PyTypeRef},
+        builtins::{PyDict, PyGenericAlias, PyTuple, PyTypeRef},
         common::lock::PyRwLock,
         function::{FuncArgs, KwArgs, OptionalArg},
         object::AsObject,
@@ -190,6 +190,15 @@ mod _functools {
 
             Ok(())
         }
+
+        #[pyclassmethod]
+        fn __class_getitem__(
+            cls: PyTypeRef,
+            args: PyObjectRef,
+            vm: &VirtualMachine,
+        ) -> PyGenericAlias {
+            PyGenericAlias::from_args(cls, args, vm)
+        }
     }
 
     impl Constructor for PyPartial {