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Code Issues Projects Releases Packages Wiki Activity Actions 3

Use Never instead of None for stores (#13984)

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## Summary

See:
https://github.com/astral-sh/ruff/pull/13981#issuecomment-2445472433
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Charlie Marsh 2024-10-30 12:03:50 -04:00 • committed by GitHub
parent 262c04f297
commit b1ce8a3949
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2 changed files with 14 additions and 22 deletions
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28
crates/red_knot_python_semantic/resources/mdtest/unpacking.md
View file

@ -81,8 +81,7 @@ reveal_type(b) # revealed: Literal[2]
```py
# TODO: Add diagnostic (need more values to unpack)
# TODO: Remove 'not-iterable' diagnostic
[a, *b, c, d] = (1, 2) # error: "Object of type `None` is not iterable"
[a, *b, c, d] = (1, 2)
reveal_type(a) # revealed: Literal[1]
# TODO: Should be list[Any] once support for assigning to starred expression is added
reveal_type(b) # revealed: @Todo
@ -93,7 +92,7 @@ reveal_type(d) # revealed: Unknown
### Starred expression (2)
```py
[a, *b, c] = (1, 2) # error: "Object of type `None` is not iterable"
[a, *b, c] = (1, 2)
reveal_type(a) # revealed: Literal[1]
# TODO: Should be list[Any] once support for assigning to starred expression is added
reveal_type(b) # revealed: @Todo
@ -103,8 +102,7 @@ reveal_type(c) # revealed: Literal[2]
### Starred expression (3)
```py
# TODO: Remove 'not-iterable' diagnostic
[a, *b, c] = (1, 2, 3) # error: "Object of type `None` is not iterable"
[a, *b, c] = (1, 2, 3)
reveal_type(a) # revealed: Literal[1]
# TODO: Should be list[int] once support for assigning to starred expression is added
reveal_type(b) # revealed: @Todo
@ -114,8 +112,7 @@ reveal_type(c) # revealed: Literal[3]
### Starred expression (4)
```py
# TODO: Remove 'not-iterable' diagnostic
[a, *b, c, d] = (1, 2, 3, 4, 5, 6) # error: "Object of type `None` is not iterable"
[a, *b, c, d] = (1, 2, 3, 4, 5, 6)
reveal_type(a) # revealed: Literal[1]
# TODO: Should be list[int] once support for assigning to starred expression is added
reveal_type(b) # revealed: @Todo
@ -126,8 +123,7 @@ reveal_type(d) # revealed: Literal[6]
### Starred expression (5)
```py
# TODO: Remove 'not-iterable' diagnostic
[a, b, *c] = (1, 2, 3, 4) # error: "Object of type `None` is not iterable"
[a, b, *c] = (1, 2, 3, 4)
reveal_type(a) # revealed: Literal[1]
reveal_type(b) # revealed: Literal[2]
# TODO: Should be list[int] once support for assigning to starred expression is added
@ -215,8 +211,7 @@ reveal_type(b) # revealed: LiteralString
```py
# TODO: Add diagnostic (need more values to unpack)
# TODO: Remove 'not-iterable' diagnostic
(a, *b, c, d) = "ab" # error: "Object of type `None` is not iterable"
(a, *b, c, d) = "ab"
reveal_type(a) # revealed: LiteralString
# TODO: Should be list[LiteralString] once support for assigning to starred expression is added
reveal_type(b) # revealed: @Todo
@ -227,7 +222,7 @@ reveal_type(d) # revealed: Unknown
### Starred expression (2)
```py
(a, *b, c) = "ab" # error: "Object of type `None` is not iterable"
(a, *b, c) = "ab"
reveal_type(a) # revealed: LiteralString
# TODO: Should be list[Any] once support for assigning to starred expression is added
reveal_type(b) # revealed: @Todo
@ -237,8 +232,7 @@ reveal_type(c) # revealed: LiteralString
### Starred expression (3)
```py
# TODO: Remove 'not-iterable' diagnostic
(a, *b, c) = "abc" # error: "Object of type `None` is not iterable"
(a, *b, c) = "abc"
reveal_type(a) # revealed: LiteralString
# TODO: Should be list[LiteralString] once support for assigning to starred expression is added
reveal_type(b) # revealed: @Todo
@ -248,8 +242,7 @@ reveal_type(c) # revealed: LiteralString
### Starred expression (4)
```py
# TODO: Remove 'not-iterable' diagnostic
(a, *b, c, d) = "abcdef" # error: "Object of type `None` is not iterable"
(a, *b, c, d) = "abcdef"
reveal_type(a) # revealed: LiteralString
# TODO: Should be list[LiteralString] once support for assigning to starred expression is added
reveal_type(b) # revealed: @Todo
@ -260,8 +253,7 @@ reveal_type(d) # revealed: LiteralString
### Starred expression (5)
```py
# TODO: Remove 'not-iterable' diagnostic
(a, b, *c) = "abcd" # error: "Object of type `None` is not iterable"
(a, b, *c) = "abcd"
reveal_type(a) # revealed: LiteralString
reveal_type(b) # revealed: LiteralString
# TODO: Should be list[int] once support for assigning to starred expression is added

8
crates/red_knot_python_semantic/src/types/infer.rs
View file

@ -1414,11 +1414,11 @@ impl<'db> TypeInferenceBuilder<'db> {
// Resolve the target type, assuming a load context.
let target_type = match &**target {
Expr::Name(name) => {
self.store_expression_type(target, Type::None);
self.store_expression_type(target, Type::Never);
self.infer_name_load(name)
}
Expr::Attribute(attr) => {
self.store_expression_type(target, Type::None);
self.store_expression_type(target, Type::Never);
self.infer_attribute_load(attr)
}
_ => self.infer_expression(target),
@ -2506,7 +2506,7 @@ impl<'db> TypeInferenceBuilder<'db> {
fn infer_name_expression(&mut self, name: &ast::ExprName) -> Type<'db> {
match name.ctx {
ExprContext::Load => self.infer_name_load(name),
ExprContext::Store | ExprContext::Del => Type::None,
ExprContext::Store | ExprContext::Del => Type::Never,
ExprContext::Invalid => Type::Unknown,
}
}
@ -2536,7 +2536,7 @@ impl<'db> TypeInferenceBuilder<'db> {
ExprContext::Load => self.infer_attribute_load(attribute),
ExprContext::Store | ExprContext::Del => {
self.infer_expression(value);
Type::None
Type::Never
}
ExprContext::Invalid => {
self.infer_expression(value);