diff --git a/Lib/test/list_tests.py b/Lib/test/list_tests.py
index 63f7fe24f..e939c99dd 100644
--- a/Lib/test/list_tests.py
+++ b/Lib/test/list_tests.py
@@ -12,8 +12,6 @@ from test import support, seq_tests
 
 class CommonTest(seq_tests.CommonTest):
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_init(self):
         # Iterable arg is optional
         self.assertEqual(self.type2test([]), self.type2test())
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index 73a15d1ef..8bf2f8665 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -47,8 +47,6 @@ class TestJointOps:
         self.s = self.thetype(word)
         self.d = dict.fromkeys(word)
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_new_or_init(self):
         self.assertRaises(TypeError, self.thetype, [], 2)
         self.assertRaises(TypeError, set().__init__, a=1)
@@ -386,8 +384,6 @@ class TestSet(TestJointOps, unittest.TestCase):
     def test_contains(self):
         super().test_contains()
 
-    # TODO: RUSTPYTHON
-    @unittest.expectedFailure
     def test_init(self):
         s = self.thetype()
         s.__init__(self.word)
diff --git a/vm/src/builtins/dict.rs b/vm/src/builtins/dict.rs
index b278cff59..d5d3988e8 100644
--- a/vm/src/builtins/dict.rs
+++ b/vm/src/builtins/dict.rs
@@ -54,10 +54,7 @@ impl PyValue for PyDict {
 impl PyDict {
     #[pyslot]
     fn tp_new(class: PyTypeRef, _args: FuncArgs, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
-        PyDict {
-            entries: DictContentType::default(),
-        }
-        .into_ref_with_type(vm, class)
+        PyDict::default().into_ref_with_type(vm, class)
     }
 
     #[pymethod(magic)]
diff --git a/vm/src/builtins/list.rs b/vm/src/builtins/list.rs
index 3f7a15038..09716a24d 100644
--- a/vm/src/builtins/list.rs
+++ b/vm/src/builtins/list.rs
@@ -391,16 +391,21 @@ impl PyList {
     #[pyslot]
     fn tp_new(
         cls: PyTypeRef,
-        iterable: OptionalArg<PyObjectRef>,
+        _iterable: OptionalArg<PyObjectRef>,
         vm: &VirtualMachine,
     ) -> PyResult<PyRef<Self>> {
-        let elements = if let OptionalArg::Present(iterable) = iterable {
+        PyList::default().into_ref_with_type(vm, cls)
+    }
+
+    #[pymethod(name = "__init__")]
+    fn init(&self, iterable: OptionalArg<PyObjectRef>, vm: &VirtualMachine) -> PyResult<()> {
+        let mut elements = if let OptionalArg::Present(iterable) = iterable {
             vm.extract_elements(&iterable)?
         } else {
             vec![]
         };
-
-        PyList::from(elements).into_ref_with_type(vm, cls)
+        std::mem::swap(self.borrow_vec_mut().deref_mut(), &mut elements);
+        Ok(())
     }
 }
 
diff --git a/vm/src/builtins/set.rs b/vm/src/builtins/set.rs
index af5c02dcb..fc34d24f3 100644
--- a/vm/src/builtins/set.rs
+++ b/vm/src/builtins/set.rs
@@ -78,14 +78,6 @@ impl PySetInner {
         Ok(set)
     }
 
-    fn from_arg(iterable: OptionalArg<PyIterable>, vm: &VirtualMachine) -> PyResult<PySetInner> {
-        if let OptionalArg::Present(iterable) = iterable {
-            Self::new(iterable, vm)
-        } else {
-            Ok(PySetInner::default())
-        }
-    }
-
     fn len(&self) -> usize {
         self.content.len()
     }
@@ -318,13 +310,21 @@ impl PySet {
     #[pyslot]
     fn tp_new(
         cls: PyTypeRef,
-        iterable: OptionalArg<PyIterable>,
+        _iterable: OptionalArg<PyIterable>,
         vm: &VirtualMachine,
     ) -> PyResult<PyRef<Self>> {
-        Self {
-            inner: PySetInner::from_arg(iterable, vm)?,
+        PySet::default().into_ref_with_type(vm, cls)
+    }
+
+    #[pymethod(magic)]
+    fn init(&self, iterable: OptionalArg<PyIterable>, vm: &VirtualMachine) -> PyResult<()> {
+        if self.len() > 0 {
+            self.clear();
         }
-        .into_ref_with_type(vm, cls)
+        if let OptionalArg::Present(it) = iterable {
+            self.update(Args::new(vec![it]), vm)?;
+        }
+        Ok(())
     }
 
     #[pymethod(name = "__len__")]