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---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/err/f_string_invalid_expression_start.py
---
## AST
```
Module(
ModModule {
node_index: NodeIndex(None),
range: 0..36,
body: [
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 0..6,
value: FString(
ExprFString {
node_index: NodeIndex(None),
range: 0..6,
value: FStringValue {
inner: Single(
FString {
range: 0..6,
node_index: NodeIndex(None),
elements: [
Interpolation(
InterpolatedElement {
range: 2..5,
node_index: NodeIndex(None),
expression: Attribute(
ExprAttribute {
node_index: NodeIndex(None),
range: 3..4,
value: Name(
ExprName {
node_index: NodeIndex(None),
range: 3..3,
id: Name(""),
ctx: Invalid,
},
),
attr: Identifier {
id: Name(""),
range: 4..4,
node_index: NodeIndex(None),
},
ctx: Load,
},
),
debug_text: None,
conversion: None,
format_spec: None,
runtime_str: None,
runtime_interpolation_format_spec: None,
runtime_formatted_value_format_spec: None,
},
),
],
flags: FStringFlags {
quote_style: Double,
prefix: Regular,
triple_quoted: false,
unclosed: false,
},
},
),
},
runtime_joined_str: None,
runtime_values: None,
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 7..15,
value: FString(
ExprFString {
node_index: NodeIndex(None),
range: 7..15,
value: FStringValue {
inner: Single(
FString {
range: 7..15,
node_index: NodeIndex(None),
elements: [
Interpolation(
InterpolatedElement {
range: 9..14,
node_index: NodeIndex(None),
expression: BinOp(
ExprBinOp {
node_index: NodeIndex(None),
range: 10..13,
left: Name(
ExprName {
node_index: NodeIndex(None),
range: 10..10,
id: Name(""),
ctx: Invalid,
},
),
op: Pow,
right: Name(
ExprName {
node_index: NodeIndex(None),
range: 12..13,
id: Name("x"),
ctx: Load,
},
),
},
),
debug_text: None,
conversion: None,
format_spec: None,
runtime_str: None,
runtime_interpolation_format_spec: None,
runtime_formatted_value_format_spec: None,
},
),
],
flags: FStringFlags {
quote_style: Double,
prefix: Regular,
triple_quoted: false,
unclosed: false,
},
},
),
},
runtime_joined_str: None,
runtime_values: None,
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 16..23,
value: FString(
ExprFString {
node_index: NodeIndex(None),
range: 16..23,
value: FStringValue {
inner: Single(
FString {
range: 16..23,
node_index: NodeIndex(None),
elements: [
Interpolation(
InterpolatedElement {
range: 18..20,
node_index: NodeIndex(None),
expression: UnaryOp(
ExprUnaryOp {
node_index: NodeIndex(None),
range: 19..20,
op: UAdd,
operand: Name(
ExprName {
node_index: NodeIndex(None),
range: 20..20,
id: Name(""),
ctx: Invalid,
},
),
},
),
debug_text: None,
conversion: None,
format_spec: None,
runtime_str: None,
runtime_interpolation_format_spec: None,
runtime_formatted_value_format_spec: None,
},
),
],
flags: FStringFlags {
quote_style: Double,
prefix: Regular,
triple_quoted: false,
unclosed: false,
},
},
),
},
runtime_joined_str: None,
runtime_values: None,
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 24..35,
value: TString(
ExprTString {
node_index: NodeIndex(None),
range: 24..35,
value: TStringValue {
inner: Single(
TString {
range: 24..35,
node_index: NodeIndex(None),
elements: [
Interpolation(
InterpolatedElement {
range: 26..34,
node_index: NodeIndex(None),
expression: Name(
ExprName {
node_index: NodeIndex(None),
range: 27..28,
id: Name("x"),
ctx: Load,
},
),
debug_text: None,
conversion: None,
format_spec: Some(
InterpolatedStringFormatSpec {
range: 29..33,
node_index: NodeIndex(None),
elements: [
Interpolation(
InterpolatedElement {
range: 29..33,
node_index: NodeIndex(None),
expression: BinOp(
ExprBinOp {
node_index: NodeIndex(None),
range: 30..32,
left: Name(
ExprName {
node_index: NodeIndex(None),
range: 30..30,
id: Name(""),
ctx: Invalid,
},
),
op: Div,
right: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 31..32,
value: Int(
5,
),
},
),
},
),
debug_text: None,
conversion: None,
format_spec: None,
runtime_str: None,
runtime_interpolation_format_spec: None,
runtime_formatted_value_format_spec: None,
},
),
],
},
),
runtime_str: None,
runtime_interpolation_format_spec: None,
runtime_formatted_value_format_spec: None,
},
),
],
flags: TStringFlags {
quote_style: Double,
prefix: Regular,
triple_quoted: false,
unclosed: false,
},
},
),
},
runtime_template_str: None,
runtime_values: None,
},
),
},
),
],
runtime_body: None,
},
)
```
## Errors
|
1 | f"{.}"
| ^ Syntax Error: f-string: expecting a valid expression after '{'
2 | f"{**x}"
3 | f"{+;}"
|
|
1 | f"{.}"
| ^ Syntax Error: invalid syntax
2 | f"{**x}"
3 | f"{+;}"
|
|
1 | f"{.}"
| ^ Syntax Error: invalid syntax
2 | f"{**x}"
3 | f"{+;}"
|
|
1 | f"{.}"
2 | f"{**x}"
| ^^ Syntax Error: f-string: expecting a valid expression after '{'
3 | f"{+;}"
4 | t"{x:{/5}}"
|
|
1 | f"{.}"
2 | f"{**x}"
| ^^ Syntax Error: invalid syntax
3 | f"{+;}"
4 | t"{x:{/5}}"
|
|
1 | f"{.}"
2 | f"{**x}"
3 | f"{+;}"
| ^ Syntax Error: f-string: expecting a valid expression after '{'
4 | t"{x:{/5}}"
|
|
1 | f"{.}"
2 | f"{**x}"
3 | f"{+;}"
| ^ Syntax Error: invalid syntax
4 | t"{x:{/5}}"
|
|
1 | f"{.}"
2 | f"{**x}"
3 | f"{+;}"
| ^ Syntax Error: expected an element of or the end of the f-string
4 | t"{x:{/5}}"
|
|
2 | f"{**x}"
3 | f"{+;}"
4 | t"{x:{/5}}"
| ^ Syntax Error: t-string: expecting a valid expression after '{'
|
2 | f"{**x}"
3 | f"{+;}"
4 | t"{x:{/5}}"
| ^ Syntax Error: invalid syntax