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---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/err/named_expr_slice.py
---
## AST
```
Module(
ModModule {
node_index: NodeIndex(None),
range: 0..119,
body: [
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 80..92,
value: Subscript(
ExprSubscript {
node_index: NodeIndex(None),
range: 80..92,
value: Name(
ExprName {
node_index: NodeIndex(None),
range: 80..83,
id: Name("lst"),
ctx: Load,
},
),
slice: Slice(
ExprSlice {
node_index: NodeIndex(None),
range: 84..91,
lower: Some(
Named(
ExprNamed {
node_index: NodeIndex(None),
range: 84..88,
target: Name(
ExprName {
node_index: NodeIndex(None),
range: 84..85,
id: Name("x"),
ctx: Store,
},
),
value: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 87..88,
value: Int(
1,
),
},
),
},
),
),
upper: Some(
UnaryOp(
ExprUnaryOp {
node_index: NodeIndex(None),
range: 89..91,
op: USub,
operand: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 90..91,
value: Int(
1,
),
},
),
},
),
),
step: None,
},
),
ctx: Load,
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 93..100,
value: Subscript(
ExprSubscript {
node_index: NodeIndex(None),
range: 93..100,
value: Name(
ExprName {
node_index: NodeIndex(None),
range: 93..96,
id: Name("lst"),
ctx: Load,
},
),
slice: Slice(
ExprSlice {
node_index: NodeIndex(None),
range: 97..100,
lower: Some(
NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 97..98,
value: Int(
1,
),
},
),
),
upper: Some(
Name(
ExprName {
node_index: NodeIndex(None),
range: 99..100,
id: Name("x"),
ctx: Load,
},
),
),
step: None,
},
),
ctx: Load,
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 102..103,
value: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 102..103,
value: Int(
1,
),
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 105..114,
value: Subscript(
ExprSubscript {
node_index: NodeIndex(None),
range: 105..114,
value: Name(
ExprName {
node_index: NodeIndex(None),
range: 105..108,
id: Name("lst"),
ctx: Load,
},
),
slice: Slice(
ExprSlice {
node_index: NodeIndex(None),
range: 109..114,
lower: Some(
NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 109..110,
value: Int(
1,
),
},
),
),
upper: Some(
NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 111..112,
value: Int(
3,
),
},
),
),
step: Some(
Name(
ExprName {
node_index: NodeIndex(None),
range: 113..114,
id: Name("x"),
ctx: Load,
},
),
),
},
),
ctx: Load,
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 116..117,
value: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 116..117,
value: Int(
1,
),
},
),
},
),
],
},
)
```
## Errors
|
1 | # even after 3.9, an unparenthesized named expression is not allowed in a slice
2 | lst[x:=1:-1]
| ^^^^ Syntax Error: Unparenthesized named expression cannot be used here
3 | lst[1:x:=1]
4 | lst[1:3:x:=1]
|
|
1 | # even after 3.9, an unparenthesized named expression is not allowed in a slice
2 | lst[x:=1:-1]
3 | lst[1:x:=1]
| ^^ Syntax Error: Expected `]`, found `:=`
4 | lst[1:3:x:=1]
|
|
1 | # even after 3.9, an unparenthesized named expression is not allowed in a slice
2 | lst[x:=1:-1]
3 | lst[1:x:=1]
| ^ Syntax Error: Expected a statement
4 | lst[1:3:x:=1]
|
|
1 | # even after 3.9, an unparenthesized named expression is not allowed in a slice
2 | lst[x:=1:-1]
3 | lst[1:x:=1]
| ^ Syntax Error: Expected a statement
4 | lst[1:3:x:=1]
|
|
2 | lst[x:=1:-1]
3 | lst[1:x:=1]
4 | lst[1:3:x:=1]
| ^^ Syntax Error: Expected `]`, found `:=`
|
|
2 | lst[x:=1:-1]
3 | lst[1:x:=1]
4 | lst[1:3:x:=1]
| ^ Syntax Error: Expected a statement
|
|
2 | lst[x:=1:-1]
3 | lst[1:x:=1]
4 | lst[1:3:x:=1]
| ^ Syntax Error: Expected a statement
|