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---
source: crates/ruff_python_parser/src/lexer.rs
expression: lex_source(source)
---
## Tokens
```
[
(
FStringStart,
0..2,
TokenFlags(
DOUBLE_QUOTES | F_STRING,
),
),
(
Lbrace,
2..3,
),
(
Name(
Name("x"),
),
3..4,
),
(
Exclamation,
4..5,
),
(
Name(
Name("s"),
),
5..6,
),
(
Rbrace,
6..7,
),
(
InterpolatedStringMiddle(
" ",
),
7..8,
TokenFlags(
DOUBLE_QUOTES | F_STRING,
),
),
(
Lbrace,
8..9,
),
(
Name(
Name("x"),
),
9..10,
),
(
Equal,
10..11,
),
(
Exclamation,
11..12,
),
(
Name(
Name("r"),
),
12..13,
),
(
Rbrace,
13..14,
),
(
InterpolatedStringMiddle(
" ",
),
14..15,
TokenFlags(
DOUBLE_QUOTES | F_STRING,
),
),
(
Lbrace,
15..16,
),
(
Name(
Name("x"),
),
16..17,
),
(
Colon,
17..18,
),
(
InterpolatedStringMiddle(
".3f!r",
),
18..23,
TokenFlags(
DOUBLE_QUOTES | F_STRING,
),
),
(
Rbrace,
23..24,
),
(
InterpolatedStringMiddle(
" {x!r}",
),
24..32,
TokenFlags(
DOUBLE_QUOTES | F_STRING,
),
),
(
FStringEnd,
32..33,
TokenFlags(
DOUBLE_QUOTES | F_STRING,
),
),
(
Newline,
33..33,
),
]
```