Separate IntoPyObject and IntoPyResult

derive/src/pyclass.rs

@@ -524,7 +524,7 @@ pub fn impl_pystruct_sequence(attr: AttributeArgs, item: Item) -> Result<TokenSt
                     vec![#(::rustpython_vm::pyobject::IntoPyObject::into_pyobject(
                         ::std::clone::Clone::clone(&self.#field_names),
                         vm,
-                    )?),*],
+                    )),*],
                 );
                 ::rustpython_vm::pyobject::PyValue::into_ref_with_type(tuple, vm, cls)
             }

vm/src/dictdatatype.rs

@@ -157,7 +157,7 @@ impl<T: Clone> Dict<T> {
                     hash_value,
                 } => {
                     // New key:
-                    self.unchecked_push(hash_index, hash_value, key.into_pyobject(vm)?, value);
+                    self.unchecked_push(hash_index, hash_value, key.into_pyobject(vm), value);
                     break Ok(());
                 }
             }

vm/src/format.rs

@@ -564,6 +564,7 @@ pub(crate) enum FormatParseError {
 }
 
 impl FormatParseError {
+    // TODO: IntoPyException
     pub fn into_pyobject(self, vm: &VirtualMachine) -> PyBaseExceptionRef {
         match self {
             FormatParseError::UnmatchedBracket => {
@@ -823,7 +824,7 @@ impl FormatString {
                             }
                             FieldNamePart::Index(index) => {
                                 // TODO Implement DictKey for usize so we can pass index directly
-                                argument = argument.get_item(&index.into_pyobject(vm)?, vm)?;
+                                argument = argument.get_item(&index.into_pyobject(vm), vm)?;
                             }
                             FieldNamePart::StringIndex(index) => {
                                 argument = argument.get_item(&index, vm)?;

vm/src/function.rs

@@ -10,7 +10,7 @@ use crate::exceptions::PyBaseExceptionRef;
 use crate::obj::objtuple::PyTupleRef;
 use crate::obj::objtype::{isinstance, PyClassRef};
 use crate::pyobject::{
-    IntoPyObject, PyObjectRef, PyRef, PyResult, PyValue, TryFromObject, TypeProtocol,
+    IntoPyResult, PyObjectRef, PyRef, PyResult, PyValue, TryFromObject, TypeProtocol,
 };
 use crate::vm::VirtualMachine;
 
@@ -524,13 +524,13 @@ macro_rules! into_py_native_func_tuple {
         where
             F: Fn($($T,)* &VirtualMachine) -> R + 'static + Send + Sync,
             $($T: FromArgs,)*
-            R: IntoPyObject,
+            R: IntoPyResult,
         {
             fn into_func(self) -> PyNativeFunc {
                 smallbox!(move |vm: &VirtualMachine, args: PyFuncArgs| {
                     let ($($n,)*) = args.bind::<($($T,)*)>(vm)?;
 
-                    (self)($($n,)* vm).into_pyobject(vm)
+                    (self)($($n,)* vm).into_pyresult(vm)
                 })
             }
         }
@@ -540,13 +540,13 @@ macro_rules! into_py_native_func_tuple {
             F: Fn(&S, $($T,)* &VirtualMachine) -> R + 'static  + Send + Sync,
             S: PyValue,
             $($T: FromArgs,)*
-            R: IntoPyObject,
+            R: IntoPyResult,
         {
             fn into_func(self) -> PyNativeFunc {
                 smallbox!(move |vm: &VirtualMachine, args: PyFuncArgs| {
                     let (zelf, $($n,)*) = args.bind::<(PyRef<S>, $($T,)*)>(vm)?;
 
-                    (self)(&zelf, $($n,)* vm).into_pyobject(vm)
+                    (self)(&zelf, $($n,)* vm).into_pyresult(vm)
                 })
             }
         }
@@ -555,7 +555,7 @@ macro_rules! into_py_native_func_tuple {
         where
             F: Fn($($T,)*) -> R + 'static  + Send + Sync,
             $($T: FromArgs,)*
-            R: IntoPyObject,
+            R: IntoPyResult,
         {
             fn into_func(self) -> PyNativeFunc {
                 IntoPyNativeFunc::into_func(move |$($n,)* _vm: &VirtualMachine| (self)($($n,)*))
@@ -567,7 +567,7 @@ macro_rules! into_py_native_func_tuple {
             F: Fn(&S, $($T,)*) -> R + 'static  + Send + Sync,
             S: PyValue,
             $($T: FromArgs,)*
-            R: IntoPyObject,
+            R: IntoPyResult,
         {
             fn into_func(self) -> PyNativeFunc {
                 IntoPyNativeFunc::into_func(move |zelf: &S, $($n,)* _vm: &VirtualMachine| (self)(zelf, $($n,)*))

vm/src/obj/objbool.rs

@@ -13,8 +13,8 @@ use super::objstr::PyStringRef;
 use super::objtype;
 
 impl IntoPyObject for bool {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_bool(self))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_bool(self)
     }
 }
 
@@ -112,7 +112,7 @@ impl PyBool {
 
     #[pymethod(name = "__ror__")]
     #[pymethod(magic)]
-    fn or(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyResult {
+    fn or(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
         if objtype::isinstance(&lhs, &vm.ctx.types.bool_type)
             && objtype::isinstance(&rhs, &vm.ctx.types.bool_type)
         {
@@ -126,7 +126,7 @@ impl PyBool {
 
     #[pymethod(name = "__rand__")]
     #[pymethod(magic)]
-    fn and(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyResult {
+    fn and(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
         if objtype::isinstance(&lhs, &vm.ctx.types.bool_type)
             && objtype::isinstance(&rhs, &vm.ctx.types.bool_type)
         {
@@ -140,7 +140,7 @@ impl PyBool {
 
     #[pymethod(name = "__rxor__")]
     #[pymethod(magic)]
-    fn xor(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyResult {
+    fn xor(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
         if objtype::isinstance(&lhs, &vm.ctx.types.bool_type)
             && objtype::isinstance(&rhs, &vm.ctx.types.bool_type)
         {

vm/src/obj/objbytes.rs

@@ -59,8 +59,8 @@ impl From<Vec<u8>> for PyBytes {
 }
 
 impl IntoPyObject for Vec<u8> {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_bytes(self))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_bytes(self)
     }
 }
 

vm/src/obj/objcomplex.rs

@@ -32,8 +32,8 @@ impl PyValue for PyComplex {
 }
 
 impl IntoPyObject for Complex64 {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_complex(self))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_complex(self)
     }
 }
 
@@ -81,10 +81,10 @@ impl PyComplex {
     where
         F: Fn(Complex64, Complex64) -> Complex64,
     {
-        try_complex(&other, vm)?.map_or_else(
-            || Ok(vm.ctx.not_implemented()),
+        Ok(try_complex(&other, vm)?.map_or_else(
+            || vm.ctx.not_implemented(),
             |other| op(self.value, other).into_pyobject(vm),
-        )
+        ))
     }
 
     #[pymethod(name = "__add__")]

vm/src/obj/objdict.rs

@@ -282,7 +282,7 @@ impl PyDictRef {
 
         if let Some(method_or_err) = vm.get_method(self.clone().into_object(), "__missing__") {
             let method = method_or_err?;
-            Ok(Some(vm.invoke(&method, vec![key.into_pyobject(vm)?])?))
+            Ok(Some(vm.invoke(&method, vec![key.into_pyobject(vm)])?))
         } else {
             Ok(None)
         }
@@ -419,7 +419,7 @@ impl PyDictRef {
     }
 
     pub fn contains_key<T: IntoPyObject>(&self, key: T, vm: &VirtualMachine) -> bool {
-        let key = key.into_pyobject(vm).unwrap();
+        let key = key.into_pyobject(vm);
         self.entries.contains(vm, &key).unwrap()
     }
 

vm/src/obj/objfloat.rs

@@ -10,8 +10,8 @@ use super::objtype::PyClassRef;
 use crate::format::FormatSpec;
 use crate::function::{OptionalArg, OptionalOption};
 use crate::pyobject::{
-    IntoPyObject, PyArithmaticValue::*, PyClassImpl, PyComparisonValue, PyContext, PyObjectRef,
-    PyRef, PyResult, PyValue, TryFromObject, TypeProtocol,
+    IntoPyObject, IntoPyResult, PyArithmaticValue::*, PyClassImpl, PyComparisonValue, PyContext,
+    PyObjectRef, PyRef, PyResult, PyValue, TryFromObject, TypeProtocol,
 };
 use crate::vm::VirtualMachine;
 use rustpython_common::{float_ops, hash};
@@ -36,13 +36,13 @@ impl PyValue for PyFloat {
 }
 
 impl IntoPyObject for f64 {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_float(self))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_float(self)
     }
 }
 impl IntoPyObject for f32 {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_float(f64::from(self)))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_float(f64::from(self))
     }
 }
 
@@ -142,9 +142,9 @@ pub fn float_pow(v1: f64, v2: f64, vm: &VirtualMachine) -> PyResult {
     } else if v1.is_sign_negative() && (v2.floor() - v2).abs() > f64::EPSILON {
         let v1 = Complex64::new(v1, 0.);
         let v2 = Complex64::new(v2, 0.);
-        v1.powc(v2).into_pyobject(vm)
+        Ok(v1.powc(v2).into_pyobject(vm))
     } else {
-        v1.powf(v2).into_pyobject(vm)
+        Ok(v1.powf(v2).into_pyobject(vm))
     }
 }
 
@@ -259,7 +259,7 @@ impl PyFloat {
     {
         try_float(&other, vm)?.map_or_else(
             || Ok(vm.ctx.not_implemented()),
-            |other| op(self.value, other).into_pyobject(vm),
+            |other| op(self.value, other).into_pyresult(vm),
         )
     }
 
@@ -270,7 +270,7 @@ impl PyFloat {
     {
         try_float(&other, vm)?.map_or_else(
             || Ok(vm.ctx.not_implemented()),
-            |other| op(self.value, other).into_pyobject(vm),
+            |other| op(self.value, other).into_pyresult(vm),
         )
     }
 

vm/src/obj/objgetset.rs

@@ -4,7 +4,7 @@
 use super::objtype::PyClassRef;
 use crate::function::{FunctionBox, OptionalArg, OwnedParam, RefParam};
 use crate::pyobject::{
-    IntoPyObject, PyClassImpl, PyContext, PyObjectRef, PyRef, PyResult, PyValue, TryFromObject,
+    IntoPyResult, PyClassImpl, PyContext, PyObjectRef, PyRef, PyResult, PyValue, TryFromObject,
     TypeProtocol,
 };
 use crate::slots::SlotDescriptor;
@@ -22,12 +22,12 @@ impl<F, T, R> IntoPyGetterFunc<(OwnedParam<T>, R, VirtualMachine)> for F
 where
     F: Fn(T, &VirtualMachine) -> R + 'static + Send + Sync,
     T: TryFromObject,
-    R: IntoPyObject,
+    R: IntoPyResult,
 {
     fn into_getter(self) -> PyGetterFunc {
         smallbox::smallbox!(move |vm: &VirtualMachine, obj| {
             let obj = T::try_from_object(vm, obj)?;
-            (self)(obj, vm).into_pyobject(vm)
+            (self)(obj, vm).into_pyresult(vm)
         })
     }
 }
@@ -36,12 +36,12 @@ impl<F, S, R> IntoPyGetterFunc<(RefParam<S>, R, VirtualMachine)> for F
 where
     F: Fn(&S, &VirtualMachine) -> R + 'static + Send + Sync,
     S: PyValue,
-    R: IntoPyObject,
+    R: IntoPyResult,
 {
     fn into_getter(self) -> PyGetterFunc {
         smallbox::smallbox!(move |vm: &VirtualMachine, obj| {
             let zelf = PyRef::<S>::try_from_object(vm, obj)?;
-            (self)(&zelf, vm).into_pyobject(vm)
+            (self)(&zelf, vm).into_pyresult(vm)
         })
     }
 }
@@ -50,7 +50,7 @@ impl<F, T, R> IntoPyGetterFunc<(OwnedParam<T>, R)> for F
 where
     F: Fn(T) -> R + 'static + Send + Sync,
     T: TryFromObject,
-    R: IntoPyObject,
+    R: IntoPyResult,
 {
     fn into_getter(self) -> PyGetterFunc {
         IntoPyGetterFunc::into_getter(move |obj, _vm: &VirtualMachine| (self)(obj))
@@ -61,7 +61,7 @@ impl<F, S, R> IntoPyGetterFunc<(RefParam<S>, R)> for F
 where
     F: Fn(&S) -> R + 'static + Send + Sync,
     S: PyValue,
-    R: IntoPyObject,
+    R: IntoPyResult,
 {
     fn into_getter(self) -> PyGetterFunc {
         IntoPyGetterFunc::into_getter(move |zelf: &S, _vm: &VirtualMachine| (self)(zelf))

vm/src/obj/objint.rs

@@ -16,8 +16,8 @@ use crate::bytesinner::PyBytesInner;
 use crate::format::FormatSpec;
 use crate::function::{OptionalArg, PyFuncArgs};
 use crate::pyobject::{
-    IdProtocol, IntoPyObject, PyArithmaticValue, PyClassImpl, PyComparisonValue, PyContext,
-    PyObjectRef, PyRef, PyResult, PyValue, TryFromObject, TypeProtocol,
+    IdProtocol, IntoPyObject, IntoPyResult, PyArithmaticValue, PyClassImpl, PyComparisonValue,
+    PyContext, PyObjectRef, PyRef, PyResult, PyValue, TryFromObject, TypeProtocol,
 };
 use crate::stdlib::array::PyArray;
 use crate::vm::VirtualMachine;
@@ -62,8 +62,8 @@ impl PyInt {
 }
 
 impl IntoPyObject for BigInt {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_int(self))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_int(self)
     }
 }
 
@@ -76,8 +76,8 @@ impl PyValue for PyInt {
 macro_rules! impl_into_pyobject_int {
     ($($t:ty)*) => {$(
         impl IntoPyObject for $t {
-            fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-                Ok(vm.ctx.new_int(self))
+            fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+                vm.ctx.new_int(self)
             }
         }
     )*};
@@ -121,7 +121,7 @@ fn inner_pow(int1: &BigInt, int2: &BigInt, vm: &VirtualMachine) -> PyResult {
     if int2.is_negative() {
         let v1 = try_float(int1, vm)?;
         let v2 = try_float(int2, vm)?;
-        objfloat::float_pow(v1, v2, vm).into_pyobject(vm)
+        objfloat::float_pow(v1, v2, vm).into_pyresult(vm)
     } else {
         Ok(if let Some(v2) = int2.to_u64() {
             vm.ctx.new_int(Pow::pow(int1, v2))

vm/src/obj/objnone.rs

@@ -18,16 +18,16 @@ impl PyValue for PyNone {
 // This allows a built-in function to not return a value, mapping to
 // Python's behavior of returning `None` in this situation.
 impl IntoPyObject for () {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.none())
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.none()
     }
 }
 
 impl<T: IntoPyObject> IntoPyObject for Option<T> {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
         match self {
             Some(x) => x.into_pyobject(vm),
-            None => Ok(vm.ctx.none()),
+            None => vm.ctx.none(),
         }
     }
 }

vm/src/obj/objstr.rs

@@ -953,7 +953,7 @@ impl PyString {
 
         let mut translated = String::new();
         for c in self.value.chars() {
-            match table.get_item(&(c as u32).into_pyobject(vm)?, vm) {
+            match table.get_item(&(c as u32).into_pyobject(vm), vm) {
                 Ok(value) => {
                     if let Some(text) = value.payload::<PyString>() {
                         translated.push_str(&text.value);
@@ -1000,7 +1000,7 @@ impl PyString {
                                 new_dict.set_item(vm.new_int(c as u32), vm.get_none(), vm)?;
                             }
                         }
-                        new_dict.into_pyobject(vm)
+                        Ok(new_dict.into_pyobject(vm))
                     } else {
                         Err(vm.new_value_error(
                             "the first two maketrans arguments must have equal length".to_owned(),
@@ -1019,14 +1019,14 @@ impl PyString {
                     for (key, val) in dict {
                         if let Some(num) = key.payload::<PyInt>() {
                             new_dict.set_item(
-                                num.as_bigint().to_i32().into_pyobject(vm)?,
+                                num.as_bigint().to_i32().into_pyobject(vm),
                                 val,
                                 vm,
                             )?;
                         } else if let Some(string) = key.payload::<PyString>() {
                             if string.len() == 1 {
                                 let num_value = string.value.chars().next().unwrap() as u32;
-                                new_dict.set_item(num_value.into_pyobject(vm)?, val, vm)?;
+                                new_dict.set_item(num_value.into_pyobject(vm), val, vm)?;
                             } else {
                                 return Err(vm.new_value_error(
                                     "string keys in translate table must be of length 1".to_owned(),
@@ -1034,7 +1034,7 @@ impl PyString {
                             }
                         }
                     }
-                    new_dict.into_pyobject(vm)
+                    Ok(new_dict.into_pyobject(vm))
                 }
                 _ => Err(vm.new_value_error(
                     "if you give only one argument to maketrans it must be a dict".to_owned(),
@@ -1100,20 +1100,20 @@ impl PyValue for PyString {
 }
 
 impl IntoPyObject for String {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_str(self))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_str(self)
     }
 }
 
 impl IntoPyObject for &str {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_str(self.to_owned()))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_str(self.to_owned())
     }
 }
 
 impl IntoPyObject for &String {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(vm.ctx.new_str(self.clone()))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        vm.ctx.new_str(self.clone())
     }
 }
 

vm/src/obj/objtuple.rs

@@ -45,8 +45,8 @@ impl PyValue for PyTuple {
 macro_rules! impl_intopyobj_tuple {
     ($(($T:ident, $idx:tt)),+) => {
         impl<$($T: IntoPyObject),*> IntoPyObject for ($($T,)*) {
-            fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-                Ok(vm.ctx.new_tuple(vec![$(self.$idx.into_pyobject(vm)?),*]))
+            fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+                vm.ctx.new_tuple(vec![$(self.$idx.into_pyobject(vm)),*])
             }
         }
     };

vm/src/pyobject.rs

@@ -965,15 +965,15 @@ where
     T: IntoPyObject,
 {
     fn get_item(&self, key: T, vm: &VirtualMachine) -> PyResult {
-        vm.call_method(self, "__getitem__", key.into_pyobject(vm)?)
+        vm.call_method(self, "__getitem__", key.into_pyobject(vm))
     }
 
     fn set_item(&self, key: T, value: PyObjectRef, vm: &VirtualMachine) -> PyResult {
-        vm.call_method(self, "__setitem__", vec![key.into_pyobject(vm)?, value])
+        vm.call_method(self, "__setitem__", vec![key.into_pyobject(vm), value])
     }
 
     fn del_item(&self, key: T, vm: &VirtualMachine) -> PyResult {
-        vm.call_method(self, "__delitem__", key.into_pyobject(vm)?)
+        vm.call_method(self, "__delitem__", key.into_pyobject(vm))
     }
 }
 
@@ -1151,45 +1151,36 @@ pub trait TryFromObject: Sized {
 /// and should be implemented by many primitive Rust types, allowing a built-in
 /// function to simply return a `bool` or a `usize` for example.
 pub trait IntoPyObject {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult;
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef;
 }
 
 impl<T> IntoPyObject for PyRef<T> {
-    fn into_pyobject(self, _vm: &VirtualMachine) -> PyResult {
-        Ok(self.obj)
+    fn into_pyobject(self, _vm: &VirtualMachine) -> PyObjectRef {
+        self.obj
     }
 }
 
 impl<T> IntoPyObject for &PyRef<T> {
-    fn into_pyobject(self, _vm: &VirtualMachine) -> PyResult {
-        Ok(self.obj.clone())
+    fn into_pyobject(self, _vm: &VirtualMachine) -> PyObjectRef {
+        self.obj.clone()
     }
 }
 
 impl IntoPyObject for PyCallable {
-    fn into_pyobject(self, _vm: &VirtualMachine) -> PyResult {
-        Ok(self.into_object())
+    fn into_pyobject(self, _vm: &VirtualMachine) -> PyObjectRef {
+        self.into_object()
     }
 }
 
 impl IntoPyObject for PyObjectRef {
-    fn into_pyobject(self, _vm: &VirtualMachine) -> PyResult {
-        Ok(self)
+    fn into_pyobject(self, _vm: &VirtualMachine) -> PyObjectRef {
+        self
     }
 }
 
 impl IntoPyObject for &PyObjectRef {
-    fn into_pyobject(self, _vm: &VirtualMachine) -> PyResult {
-        Ok(self.clone())
-    }
-}
-
-impl<T> IntoPyObject for PyResult<T>
-where
-    T: IntoPyObject,
-{
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        self.and_then(|res| T::into_pyobject(res, vm))
+    fn into_pyobject(self, _vm: &VirtualMachine) -> PyObjectRef {
+        self.clone()
     }
 }
 
@@ -1199,8 +1190,30 @@ impl<T> IntoPyObject for T
 where
     T: PyValue + Sized,
 {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
-        Ok(PyObject::new(self, T::class(vm), None))
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        PyObject::new(self, T::class(vm), None)
+    }
+}
+
+pub trait IntoPyResult {
+    fn into_pyresult(self, vm: &VirtualMachine) -> PyResult;
+}
+
+impl<T> IntoPyResult for T
+where
+    T: IntoPyObject,
+{
+    fn into_pyresult(self, vm: &VirtualMachine) -> PyResult {
+        Ok(self.into_pyobject(vm))
+    }
+}
+
+impl<T> IntoPyResult for PyResult<T>
+where
+    T: IntoPyObject,
+{
+    fn into_pyresult(self, vm: &VirtualMachine) -> PyResult {
+        self.map(|res| T::into_pyobject(res, vm))
     }
 }
 
@@ -1434,10 +1447,10 @@ impl<T> IntoPyObject for PyArithmaticValue<T>
 where
     T: IntoPyObject,
 {
-    fn into_pyobject(self, vm: &VirtualMachine) -> PyResult {
+    fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
         match self {
             PyArithmaticValue::Implemented(v) => v.into_pyobject(vm),
-            PyArithmaticValue::NotImplemented => Ok(vm.ctx.not_implemented()),
+            PyArithmaticValue::NotImplemented => vm.ctx.not_implemented(),
         }
     }
 }

vm/src/stdlib/array.rs

@@ -78,7 +78,7 @@ macro_rules! def_array_enum {
                 Ok(())
             }
 
-            fn pop(&mut self, i: usize, vm: &VirtualMachine) -> PyResult {
+            fn pop(&mut self, i: usize, vm: &VirtualMachine) -> PyObjectRef {
                 match self {
                     $(ArrayContentType::$n(v) => {
                         v.remove(i).into_pyobject(vm)
@@ -182,7 +182,7 @@ macro_rules! def_array_enum {
                 Ok(i)
             }
 
-            fn getitem_by_idx(&self, i: usize, vm: &VirtualMachine) -> Option<PyResult> {
+            fn getitem_by_idx(&self, i: usize, vm: &VirtualMachine) -> Option<PyObjectRef> {
                 match self {
                     $(ArrayContentType::$n(v) => v.get(i).map(|x| x.into_pyobject(vm)),)*
                 }
@@ -191,11 +191,9 @@ macro_rules! def_array_enum {
             fn getitem(&self, needle: Either<isize, PySliceRef>, vm: &VirtualMachine) -> PyResult {
                 match needle {
                     Either::A(i) => {
-                        let i = match self.idx(i, "array", vm) {
-                            Ok(v) => v,
-                            Err(e) => return Err(e),
-                        };
-                        self.getitem_by_idx(i, vm).unwrap()
+                        self.idx(i, "array", vm).map(|i| {
+                            self.getitem_by_idx(i, vm).unwrap()
+                        })
                     }
                     Either::B(_slice) => Err(vm.new_not_implemented_error("array slice is not implemented".to_owned())),
                 }
@@ -214,7 +212,7 @@ macro_rules! def_array_enum {
                 }
             }
 
-            fn iter<'a>(&'a self, vm: &'a VirtualMachine) -> impl Iterator<Item = PyResult> + 'a {
+            fn iter<'a>(&'a self, vm: &'a VirtualMachine) -> impl Iterator<Item = PyObjectRef> + 'a {
                 let mut i = 0;
                 std::iter::from_fn(move || {
                     let ret = self.getitem_by_idx(i, vm);
@@ -379,7 +377,7 @@ impl PyArray {
             Err(vm.new_index_error("pop from empty array".to_owned()))
         } else {
             let i = self.borrow_value().idx(i.unwrap_or(-1), "pop", vm)?;
-            self.borrow_value_mut().pop(i, vm)
+            Ok(self.borrow_value_mut().pop(i, vm))
         }
     }
 
@@ -393,7 +391,7 @@ impl PyArray {
         let array = self.borrow_value();
         let mut v = Vec::with_capacity(array.len());
         for obj in array.iter(vm) {
-            v.push(obj?);
+            v.push(obj);
         }
         Ok(vm.ctx.new_list(v))
     }
@@ -428,7 +426,7 @@ impl PyArray {
             Ok(vm.new_bool(false))
         } else {
             for (a, b) in lhs.iter(vm).zip(rhs.iter(vm)) {
-                let ne = objbool::boolval(vm, vm._ne(a?, b?)?)?;
+                let ne = objbool::boolval(vm, vm._ne(a, b)?)?;
                 if ne {
                     return Ok(vm.new_bool(false));
                 }
@@ -445,7 +443,7 @@ impl PyArray {
         let rhs = rhs.borrow_value();
 
         for (a, b) in lhs.iter(vm).zip(rhs.iter(vm)) {
-            let lt = objbool::boolval(vm, vm._lt(a?, b?)?)?;
+            let lt = objbool::boolval(vm, vm._lt(a, b)?)?;
 
             if lt {
                 return Ok(vm.new_bool(true));
@@ -463,7 +461,7 @@ impl PyArray {
         let rhs = rhs.borrow_value();
 
         for (a, b) in lhs.iter(vm).zip(rhs.iter(vm)) {
-            let le = objbool::boolval(vm, vm._le(a?, b?)?)?;
+            let le = objbool::boolval(vm, vm._le(a, b)?)?;
 
             if le {
                 return Ok(vm.new_bool(true));
@@ -481,7 +479,7 @@ impl PyArray {
         let rhs = rhs.borrow_value();
 
         for (a, b) in lhs.iter(vm).zip(rhs.iter(vm)) {
-            let gt = objbool::boolval(vm, vm._gt(a?, b?)?)?;
+            let gt = objbool::boolval(vm, vm._gt(a, b)?)?;
 
             if gt {
                 return Ok(vm.new_bool(true));
@@ -499,7 +497,7 @@ impl PyArray {
         let rhs = rhs.borrow_value();
 
         for (a, b) in lhs.iter(vm).zip(rhs.iter(vm)) {
-            let ge = objbool::boolval(vm, vm._ge(a?, b?)?)?;
+            let ge = objbool::boolval(vm, vm._ge(a, b)?)?;
 
             if ge {
                 return Ok(vm.new_bool(true));
@@ -542,7 +540,7 @@ impl PyArrayIter {
     fn next(&self, vm: &VirtualMachine) -> PyResult {
         let pos = self.position.fetch_add(1);
         if let Some(item) = self.array.borrow_value().getitem_by_idx(pos, vm) {
-            Ok(item?)
+            Ok(item)
         } else {
             Err(objiter::new_stop_iteration(vm))
         }

vm/src/stdlib/csv.rs

@@ -68,7 +68,7 @@ pub fn build_reader(
 ) -> PyResult {
     let config = ReaderOption::new(args, vm)?;
 
-    Reader::new(iterable, config).into_ref(vm).into_pyobject(vm)
+    Ok(Reader::new(iterable, config).into_ref(vm).into_pyobject(vm))
 }
 
 fn into_strings(iterable: &PyIterable<PyObjectRef>, vm: &VirtualMachine) -> PyResult<Vec<String>> {
@@ -152,7 +152,7 @@ impl Reader {
     #[pymethod(name = "__iter__")]
     fn iter(this: PyRef<Self>, vm: &VirtualMachine) -> PyResult {
         this.state.write().cast_to_reader(vm)?;
-        this.into_pyobject(vm)
+        Ok(this.into_pyobject(vm))
     }
 
     #[pymethod(name = "__next__")]
@@ -167,7 +167,7 @@ impl Reader {
                         let iter = records
                             .into_iter()
                             .map(|bytes| bytes.into_pyobject(vm))
-                            .collect::<PyResult<Vec<_>>>()?;
+                            .collect::<Vec<_>>();
                         Ok(vm.ctx.new_list(iter))
                     }
                     Err(_err) => {

vm/src/stdlib/socket.rs

@@ -551,7 +551,7 @@ fn socket_getaddrinfo(opts: GAIOptions, vm: &VirtualMachine) -> PyResult {
                         Some(s) => vm.new_str(s),
                         None => vm.get_none(),
                     },
-                    get_addr_tuple(ai.sockaddr).into_pyobject(vm).unwrap(),
+                    get_addr_tuple(ai.sockaddr).into_pyobject(vm),
                 ])
             })
         })

vm/src/stdlib/ssl.rs

@@ -770,7 +770,7 @@ pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {
         // Constants
         "OPENSSL_VERSION" => ctx.new_str(openssl::version::version().to_owned()),
         "OPENSSL_VERSION_NUMBER" => ctx.new_int(openssl::version::number()),
-        "OPENSSL_VERSION_INFO" => parse_version_info(openssl::version::number()).into_pyobject(vm).unwrap(),
+        "OPENSSL_VERSION_INFO" => parse_version_info(openssl::version::number()).into_pyobject(vm),
         "PROTOCOL_SSLv2" => ctx.new_int(SslVersion::Ssl2 as u32),
         "PROTOCOL_SSLv3" => ctx.new_int(SslVersion::Ssl3 as u32),
         "PROTOCOL_SSLv23" => ctx.new_int(SslVersion::Tls as u32),

vm/src/stdlib/string.rs

@@ -21,7 +21,7 @@ mod _string {
         format_spec: Option<String>,
         preconversion_spec: Option<char>,
         vm: &VirtualMachine,
-    ) -> PyResult {
+    ) -> PyObjectRef {
         let tuple = (
             literal,
             field_name,
@@ -51,7 +51,7 @@ mod _string {
                         Some(format_spec),
                         preconversion_spec,
                         vm,
-                    )?);
+                    ));
                 }
                 FormatPart::Literal(text) => literal.push_str(&text),
             }
@@ -63,7 +63,7 @@ mod _string {
                 None,
                 None,
                 vm,
-            )?);
+            ));
         }
         Ok(result.into())
     }
@@ -77,17 +77,17 @@ mod _string {
 
         let first = match field_name.field_type {
             FieldType::Auto => vm.new_str("".to_owned()),
-            FieldType::Index(index) => index.into_pyobject(vm)?,
-            FieldType::Keyword(attribute) => attribute.into_pyobject(vm)?,
+            FieldType::Index(index) => index.into_pyobject(vm),
+            FieldType::Keyword(attribute) => attribute.into_pyobject(vm),
         };
 
         let rest = field_name
             .parts
             .iter()
             .map(|p| match p {
-                FieldNamePart::Attribute(attribute) => (true, attribute).into_pyobject(vm).unwrap(),
-                FieldNamePart::StringIndex(index) => (false, index).into_pyobject(vm).unwrap(),
-                FieldNamePart::Index(index) => (false, *index).into_pyobject(vm).unwrap(),
+                FieldNamePart::Attribute(attribute) => (true, attribute).into_pyobject(vm),
+                FieldNamePart::StringIndex(index) => (false, index).into_pyobject(vm),
+                FieldNamePart::Index(index) => (false, *index).into_pyobject(vm),
             })
             .collect();
 

vm/src/sysmodule.rs

@@ -576,12 +576,8 @@ settrace() -- set the global debug tracing function
     module_names.push("sys".to_owned());
     module_names.push("builtins".to_owned());
     module_names.sort();
-    let builtin_module_names = ctx.new_tuple(
-        module_names
-            .iter()
-            .map(|v| v.into_pyobject(vm).unwrap())
-            .collect(),
-    );
+    let builtin_module_names =
+        ctx.new_tuple(module_names.iter().map(|v| v.into_pyobject(vm)).collect());
     let modules = ctx.new_dict();
 
     let prefix = option_env!("RUSTPYTHON_PREFIX").unwrap_or("/usr/local");