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Fixed a bug that results in incorrect (local) type evaluation of an instance variable with a declared type when assigned within a loop that uses an augmented assignment. This addresses #8090. (#8093)
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@ -117,6 +117,7 @@ export function validateBinaryOperation(
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): Type {
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const leftType = leftTypeResult.type;
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const rightType = rightTypeResult.type;
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const isIncomplete = !!leftTypeResult.isIncomplete || !!rightTypeResult.isIncomplete;
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let type: Type | undefined;
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let concreteLeftType = evaluator.makeTopLevelTypeVarsConcrete(leftType);
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@ -485,7 +486,8 @@ export function validateBinaryOperation(
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);
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}
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}
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return resultType;
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return resultType ?? UnknownType.create(isIncomplete);
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}
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);
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}
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@ -493,7 +495,7 @@ export function validateBinaryOperation(
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}
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}
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return type ?? UnknownType.create();
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return type ?? UnknownType.create(isIncomplete);
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}
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export function getTypeOfBinaryOperation(
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@ -738,7 +740,7 @@ export function getTypeOfBinaryOperation(
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// within a loop construct using __add__.
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const isTupleAddAllowed = !isUnion(leftType);
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let type = validateBinaryOperation(
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const type = validateBinaryOperation(
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evaluator,
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node.operator,
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{ type: leftType, isIncomplete: leftTypeResult.isIncomplete },
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@ -788,8 +790,6 @@ export function getTypeOfBinaryOperation(
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);
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}
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}
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type = UnknownType.create();
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}
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return { type, isIncomplete, typeErrors };
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@ -934,8 +934,6 @@ export function getTypeOfAugmentedAssignment(
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node
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);
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}
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type = UnknownType.create();
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}
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typeResult = { type, isIncomplete };
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@ -1073,7 +1071,7 @@ export function getTypeOfUnaryOperation(
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}
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}
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type = UnknownType.create();
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type = UnknownType.create(isIncomplete);
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}
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}
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}
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@ -26040,6 +26040,11 @@ export function createTypeEvaluator(
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// should be completely reworked once there has been a public discussion
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// about the correct behavior.
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// If the result is incomplete, do not attempt to narrow the type.
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if (assignedTypeResult.isIncomplete) {
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return assignedTypeResult;
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}
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const narrowedType = mapSubtypes(assignedTypeResult.type, (assignedSubtype) => {
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// Handle the special case where the assigned type is a literal type.
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// Some types include very large unions of literal types, and we don't
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24
packages/pyright-internal/src/tests/samples/loop48.py
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24
packages/pyright-internal/src/tests/samples/loop48.py
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@ -0,0 +1,24 @@
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# This sample tests a case where an instance variable is assigned within
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# a loop using its own value.
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# pyright: strict
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class ClassA:
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x: int | None
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def method1(self) -> None:
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self.x = 0
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for _ in range(1, 10):
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self.x = reveal_type(self.x, expected_text="int") + 1
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reveal_type(self.x, expected_text="int")
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def method2(self) -> None:
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self.x = 0
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for _ in range(1, 10):
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self.x += 1
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reveal_type(self.x, expected_text="int")
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@ -455,6 +455,12 @@ test('Loop47', () => {
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TestUtils.validateResults(analysisResults, 0);
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});
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test('Loop48', () => {
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const analysisResults = TestUtils.typeAnalyzeSampleFiles(['loop48.py']);
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TestUtils.validateResults(analysisResults, 0);
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});
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test('ForLoop1', () => {
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const analysisResults = TestUtils.typeAnalyzeSampleFiles(['forLoop1.py']);
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