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[pylint] Update missing-maxsplit-arg docs and error to suggest proper usage (PLC0207) #18949

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Jul 8, 2025
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[pylint] Update missing-maxsplit-arg docs and error to suggest proper usage (PLC0207) #18949

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3680ae7
update docs and error message to clarify accessing last element with …
junhsonjb Jun 26, 2025
970a74e
build error msg based on function call and index
junhsonjb Jun 30, 2025
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update docs
junhsonjb Jun 30, 2025
82c3b77
slight update to error message
junhsonjb Jun 30, 2025
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update snapshots
junhsonjb Jun 30, 2025
a14a518
format, lint, and pre-commit
junhsonjb Jun 30, 2025
2755044
better variable names
junhsonjb Jul 1, 2025
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use SliceBoundary enum instead of i64 to represent slice index
junhsonjb Jul 2, 2025
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40 changes: 34 additions & 6 deletions crates/ruff_linter/src/rules/pylint/rules/missing_maxsplit_arg.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,11 +10,11 @@ use crate::Violation;
use crate::checkers::ast::Checker;

/// ## What it does
/// Checks for access to the first or last element of `str.split()` without
/// Checks for access to the first or last element of `str.split()` or `str.rsplit()` without
/// `maxsplit=1`
///
/// ## Why is this bad?
/// Calling `str.split()` without `maxsplit` set splits on every delimiter in the
/// Calling `str.split()` or `str.rsplit()` without passing `maxsplit=1` splits on every delimiter in the
/// string. When accessing only the first or last element of the result, it
/// would be more efficient to only split once.
///
Expand All @@ -29,14 +29,36 @@ use crate::checkers::ast::Checker;
/// url = "www.example.com"
/// prefix = url.split(".", maxsplit=1)[0]
/// ```
///
/// To access the last element, use `str.rsplit()` instead of `str.split()`:
/// ```python
/// url = "www.example.com"
/// suffix = url.rsplit(".", maxsplit=1)[-1]
/// ```
#[derive(ViolationMetadata)]
pub(crate) struct MissingMaxsplitArg;
pub(crate) struct MissingMaxsplitArg {
index: i64,
function: String,
}

impl Violation for MissingMaxsplitArg {
#[derive_message_formats]
fn message(&self) -> String {
"Accessing only the first or last element of `str.split()` without setting `maxsplit=1`"
.to_string()
let MissingMaxsplitArg { index, function } = self;

let correct_function = match index {
0 => "split",
-1 => "rsplit",
_ => "", // We should never hit this case
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@MeGaGiGaGon MeGaGiGaGon Jun 30, 2025

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This should probably be an unreachable! instead, since if that case is hit it should cause a failure instead of a silent issue.

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@ntBre ntBre Jul 1, 2025

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I think we should probably define a simple enum instead of using an i64. That way we can check for known values up front and bail out of the whole diagnostic. Then we can match exhaustively here.

};

if function == correct_function {
format!("Pass `maxsplit=1` into `str.{function}()`")
} else {
format!(
"Instead of `str.{function}()`, call `str.{correct_function}()` and pass `maxsplit=1`",
)
}
}
}

Expand Down Expand Up @@ -129,5 +151,11 @@ pub(crate) fn missing_maxsplit_arg(checker: &Checker, value: &Expr, slice: &Expr
}
}

checker.report_diagnostic(MissingMaxsplitArg, expr.range());
checker.report_diagnostic(
MissingMaxsplitArg {
index: index.expect("Invalid slice index"),
function: attr.to_string(),
},
expr.range(),
);
}
68 changes: 34 additions & 34 deletions .../pylint/snapshots/ruff_linter__rules__pylint__tests__PLC0207_missing_maxsplit_arg.py.snap
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
---
source: crates/ruff_linter/src/rules/pylint/mod.rs
---
missing_maxsplit_arg.py:14:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:14:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
12 | # Errors
13 | ## Test split called directly on string literal
Expand All @@ -11,7 +11,7 @@ missing_maxsplit_arg.py:14:1: PLC0207 Accessing only the first or last element o
16 | "1,2,3".rsplit(",")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:15:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:15:1: PLC0207 Instead of `str.split()`, call `str.rsplit()` and pass `maxsplit=1`
|
13 | ## Test split called directly on string literal
14 | "1,2,3".split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -21,7 +21,7 @@ missing_maxsplit_arg.py:15:1: PLC0207 Accessing only the first or last element o
17 | "1,2,3".rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:16:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:16:1: PLC0207 Instead of `str.rsplit()`, call `str.split()` and pass `maxsplit=1`
|
14 | "1,2,3".split(",")[0] # [missing-maxsplit-arg]
15 | "1,2,3".split(",")[-1] # [missing-maxsplit-arg]
Expand All @@ -30,7 +30,7 @@ missing_maxsplit_arg.py:16:1: PLC0207 Accessing only the first or last element o
17 | "1,2,3".rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:17:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:17:1: PLC0207 Pass `maxsplit=1` into `str.rsplit()`
|
15 | "1,2,3".split(",")[-1] # [missing-maxsplit-arg]
16 | "1,2,3".rsplit(",")[0] # [missing-maxsplit-arg]
Expand All @@ -40,7 +40,7 @@ missing_maxsplit_arg.py:17:1: PLC0207 Accessing only the first or last element o
19 | ## Test split called on string variable
|

missing_maxsplit_arg.py:20:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:20:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
19 | ## Test split called on string variable
20 | SEQ.split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -49,7 +49,7 @@ missing_maxsplit_arg.py:20:1: PLC0207 Accessing only the first or last element o
22 | SEQ.rsplit(",")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:21:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:21:1: PLC0207 Instead of `str.split()`, call `str.rsplit()` and pass `maxsplit=1`
|
19 | ## Test split called on string variable
20 | SEQ.split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -59,7 +59,7 @@ missing_maxsplit_arg.py:21:1: PLC0207 Accessing only the first or last element o
23 | SEQ.rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:22:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:22:1: PLC0207 Instead of `str.rsplit()`, call `str.split()` and pass `maxsplit=1`
|
20 | SEQ.split(",")[0] # [missing-maxsplit-arg]
21 | SEQ.split(",")[-1] # [missing-maxsplit-arg]
Expand All @@ -68,7 +68,7 @@ missing_maxsplit_arg.py:22:1: PLC0207 Accessing only the first or last element o
23 | SEQ.rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:23:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:23:1: PLC0207 Pass `maxsplit=1` into `str.rsplit()`
|
21 | SEQ.split(",")[-1] # [missing-maxsplit-arg]
22 | SEQ.rsplit(",")[0] # [missing-maxsplit-arg]
Expand All @@ -78,7 +78,7 @@ missing_maxsplit_arg.py:23:1: PLC0207 Accessing only the first or last element o
25 | ## Test split called on class attribute
|

missing_maxsplit_arg.py:26:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:26:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
25 | ## Test split called on class attribute
26 | Foo.class_str.split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -87,7 +87,7 @@ missing_maxsplit_arg.py:26:1: PLC0207 Accessing only the first or last element o
28 | Foo.class_str.rsplit(",")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:27:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:27:1: PLC0207 Instead of `str.split()`, call `str.rsplit()` and pass `maxsplit=1`
|
25 | ## Test split called on class attribute
26 | Foo.class_str.split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -97,7 +97,7 @@ missing_maxsplit_arg.py:27:1: PLC0207 Accessing only the first or last element o
29 | Foo.class_str.rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:28:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:28:1: PLC0207 Instead of `str.rsplit()`, call `str.split()` and pass `maxsplit=1`
|
26 | Foo.class_str.split(",")[0] # [missing-maxsplit-arg]
27 | Foo.class_str.split(",")[-1] # [missing-maxsplit-arg]
Expand All @@ -106,7 +106,7 @@ missing_maxsplit_arg.py:28:1: PLC0207 Accessing only the first or last element o
29 | Foo.class_str.rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:29:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:29:1: PLC0207 Pass `maxsplit=1` into `str.rsplit()`
|
27 | Foo.class_str.split(",")[-1] # [missing-maxsplit-arg]
28 | Foo.class_str.rsplit(",")[0] # [missing-maxsplit-arg]
Expand All @@ -116,7 +116,7 @@ missing_maxsplit_arg.py:29:1: PLC0207 Accessing only the first or last element o
31 | ## Test split called on sliced string
|

missing_maxsplit_arg.py:32:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:32:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
31 | ## Test split called on sliced string
32 | "1,2,3"[::-1].split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -125,7 +125,7 @@ missing_maxsplit_arg.py:32:1: PLC0207 Accessing only the first or last element o
34 | SEQ[:3].split(",")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:33:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:33:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
31 | ## Test split called on sliced string
32 | "1,2,3"[::-1].split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -135,7 +135,7 @@ missing_maxsplit_arg.py:33:1: PLC0207 Accessing only the first or last element o
35 | Foo.class_str[1:3].split(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:34:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:34:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
32 | "1,2,3"[::-1].split(",")[0] # [missing-maxsplit-arg]
33 | "1,2,3"[::-1][::-1].split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -145,7 +145,7 @@ missing_maxsplit_arg.py:34:1: PLC0207 Accessing only the first or last element o
36 | "1,2,3"[::-1].rsplit(",")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:35:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:35:1: PLC0207 Instead of `str.split()`, call `str.rsplit()` and pass `maxsplit=1`
|
33 | "1,2,3"[::-1][::-1].split(",")[0] # [missing-maxsplit-arg]
34 | SEQ[:3].split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -155,7 +155,7 @@ missing_maxsplit_arg.py:35:1: PLC0207 Accessing only the first or last element o
37 | SEQ[:3].rsplit(",")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:36:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:36:1: PLC0207 Instead of `str.rsplit()`, call `str.split()` and pass `maxsplit=1`
|
34 | SEQ[:3].split(",")[0] # [missing-maxsplit-arg]
35 | Foo.class_str[1:3].split(",")[-1] # [missing-maxsplit-arg]
Expand All @@ -165,7 +165,7 @@ missing_maxsplit_arg.py:36:1: PLC0207 Accessing only the first or last element o
38 | Foo.class_str[1:3].rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:37:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:37:1: PLC0207 Instead of `str.rsplit()`, call `str.split()` and pass `maxsplit=1`
|
35 | Foo.class_str[1:3].split(",")[-1] # [missing-maxsplit-arg]
36 | "1,2,3"[::-1].rsplit(",")[0] # [missing-maxsplit-arg]
Expand All @@ -174,7 +174,7 @@ missing_maxsplit_arg.py:37:1: PLC0207 Accessing only the first or last element o
38 | Foo.class_str[1:3].rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:38:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:38:1: PLC0207 Pass `maxsplit=1` into `str.rsplit()`
|
36 | "1,2,3"[::-1].rsplit(",")[0] # [missing-maxsplit-arg]
37 | SEQ[:3].rsplit(",")[0] # [missing-maxsplit-arg]
Expand All @@ -184,7 +184,7 @@ missing_maxsplit_arg.py:38:1: PLC0207 Accessing only the first or last element o
40 | ## Test sep given as named argument
|

missing_maxsplit_arg.py:41:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:41:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
40 | ## Test sep given as named argument
41 | "1,2,3".split(sep=",")[0] # [missing-maxsplit-arg]
Expand All @@ -193,7 +193,7 @@ missing_maxsplit_arg.py:41:1: PLC0207 Accessing only the first or last element o
43 | "1,2,3".rsplit(sep=",")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:42:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:42:1: PLC0207 Instead of `str.split()`, call `str.rsplit()` and pass `maxsplit=1`
|
40 | ## Test sep given as named argument
41 | "1,2,3".split(sep=",")[0] # [missing-maxsplit-arg]
Expand All @@ -203,7 +203,7 @@ missing_maxsplit_arg.py:42:1: PLC0207 Accessing only the first or last element o
44 | "1,2,3".rsplit(sep=",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:43:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:43:1: PLC0207 Instead of `str.rsplit()`, call `str.split()` and pass `maxsplit=1`
|
41 | "1,2,3".split(sep=",")[0] # [missing-maxsplit-arg]
42 | "1,2,3".split(sep=",")[-1] # [missing-maxsplit-arg]
Expand All @@ -212,7 +212,7 @@ missing_maxsplit_arg.py:43:1: PLC0207 Accessing only the first or last element o
44 | "1,2,3".rsplit(sep=",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:44:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:44:1: PLC0207 Pass `maxsplit=1` into `str.rsplit()`
|
42 | "1,2,3".split(sep=",")[-1] # [missing-maxsplit-arg]
43 | "1,2,3".rsplit(sep=",")[0] # [missing-maxsplit-arg]
Expand All @@ -222,7 +222,7 @@ missing_maxsplit_arg.py:44:1: PLC0207 Accessing only the first or last element o
46 | ## Special cases
|

missing_maxsplit_arg.py:47:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:47:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
46 | ## Special cases
47 | "1,2,3".split("\n")[0] # [missing-maxsplit-arg]
Expand All @@ -231,7 +231,7 @@ missing_maxsplit_arg.py:47:1: PLC0207 Accessing only the first or last element o
49 | "1,2,3".rsplit("rsplit")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:48:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:48:1: PLC0207 Instead of `str.split()`, call `str.rsplit()` and pass `maxsplit=1`
|
46 | ## Special cases
47 | "1,2,3".split("\n")[0] # [missing-maxsplit-arg]
Expand All @@ -240,7 +240,7 @@ missing_maxsplit_arg.py:48:1: PLC0207 Accessing only the first or last element o
49 | "1,2,3".rsplit("rsplit")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:49:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:49:1: PLC0207 Instead of `str.rsplit()`, call `str.split()` and pass `maxsplit=1`
|
47 | "1,2,3".split("\n")[0] # [missing-maxsplit-arg]
48 | "1,2,3".split("split")[-1] # [missing-maxsplit-arg]
Expand All @@ -250,7 +250,7 @@ missing_maxsplit_arg.py:49:1: PLC0207 Accessing only the first or last element o
51 | ## Test class attribute named split
|

missing_maxsplit_arg.py:52:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:52:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
51 | ## Test class attribute named split
52 | Bar.split.split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -259,7 +259,7 @@ missing_maxsplit_arg.py:52:1: PLC0207 Accessing only the first or last element o
54 | Bar.split.rsplit(",")[0] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:53:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:53:1: PLC0207 Instead of `str.split()`, call `str.rsplit()` and pass `maxsplit=1`
|
51 | ## Test class attribute named split
52 | Bar.split.split(",")[0] # [missing-maxsplit-arg]
Expand All @@ -269,7 +269,7 @@ missing_maxsplit_arg.py:53:1: PLC0207 Accessing only the first or last element o
55 | Bar.split.rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:54:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:54:1: PLC0207 Instead of `str.rsplit()`, call `str.split()` and pass `maxsplit=1`
|
52 | Bar.split.split(",")[0] # [missing-maxsplit-arg]
53 | Bar.split.split(",")[-1] # [missing-maxsplit-arg]
Expand All @@ -278,7 +278,7 @@ missing_maxsplit_arg.py:54:1: PLC0207 Accessing only the first or last element o
55 | Bar.split.rsplit(",")[-1] # [missing-maxsplit-arg]
|

missing_maxsplit_arg.py:55:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:55:1: PLC0207 Pass `maxsplit=1` into `str.rsplit()`
|
53 | Bar.split.split(",")[-1] # [missing-maxsplit-arg]
54 | Bar.split.rsplit(",")[0] # [missing-maxsplit-arg]
Expand All @@ -288,14 +288,14 @@ missing_maxsplit_arg.py:55:1: PLC0207 Accessing only the first or last element o
57 | ## Test unpacked dict literal kwargs
|

missing_maxsplit_arg.py:58:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:58:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
57 | ## Test unpacked dict literal kwargs
58 | "1,2,3".split(**{"sep": ","})[0] # [missing-maxsplit-arg]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ PLC0207
|

missing_maxsplit_arg.py:179:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:179:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
177 | # Errors
178 | kwargs_without_maxsplit = {"seq": ","}
Expand All @@ -305,7 +305,7 @@ missing_maxsplit_arg.py:179:1: PLC0207 Accessing only the first or last element
181 | kwargs_with_maxsplit = {"maxsplit": 1}
|

missing_maxsplit_arg.py:182:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:182:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
180 | # OK
181 | kwargs_with_maxsplit = {"maxsplit": 1}
Expand All @@ -315,7 +315,7 @@ missing_maxsplit_arg.py:182:1: PLC0207 Accessing only the first or last element
184 | "1,2,3".split(**kwargs_with_maxsplit)[0] # TODO: false positive
|

missing_maxsplit_arg.py:184:1: PLC0207 Accessing only the first or last element of `str.split()` without setting `maxsplit=1`
missing_maxsplit_arg.py:184:1: PLC0207 Pass `maxsplit=1` into `str.split()`
|
182 | "1,2,3".split(",", **kwargs_with_maxsplit)[0] # TODO: false positive
183 | kwargs_with_maxsplit = {"sep": ",", "maxsplit": 1}
Expand Down
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