autofixes for PD003, PD004, PD008, PD009 and PD011

README.md

@@ -1322,13 +1322,13 @@ For more, see [pandas-vet](https://pypi.org/project/pandas-vet/) on PyPI.
 | Code | Name | Message | Fix |
 | ---- | ---- | ------- | --- |
 | PD002 | use-of-inplace-argument | `inplace=True` should be avoided; it has inconsistent behavior | 🛠 |
-| PD003 | use-of-dot-is-null | `.isna` is preferred to `.isnull`; functionality is equivalent |  |
-| PD004 | use-of-dot-not-null | `.notna` is preferred to `.notnull`; functionality is equivalent |  |
+| PD003 | use-of-dot-is-null | `.isna` is preferred to `.isnull`; functionality is equivalent | 🛠 |
+| PD004 | use-of-dot-not-null | `.notna` is preferred to `.notnull`; functionality is equivalent | 🛠 |
 | PD007 | use-of-dot-ix | `.ix` is deprecated; use more explicit `.loc` or `.iloc` |  |
-| PD008 | use-of-dot-at | Use `.loc` instead of `.at`.  If speed is important, use numpy. |  |
-| PD009 | use-of-dot-iat | Use `.iloc` instead of `.iat`.  If speed is important, use numpy. |  |
+| PD008 | use-of-dot-at | Use `.loc` instead of `.at`.  If speed is important, use numpy. | 🛠 |
+| PD009 | use-of-dot-iat | Use `.iloc` instead of `.iat`.  If speed is important, use numpy. | 🛠 |
 | PD010 | use-of-dot-pivot-or-unstack | `.pivot_table` is preferred to `.pivot` or `.unstack`; provides same functionality |  |
-| PD011 | use-of-dot-values | Use `.to_numpy()` instead of `.values` |  |
+| PD011 | use-of-dot-values | Use `.to_numpy()` instead of `.values` | 🛠 |
 | PD012 | use-of-dot-read-table | `.read_csv` is preferred to `.read_table`; provides same functionality |  |
 | PD013 | use-of-dot-stack | `.melt` is preferred to `.stack`; provides same functionality |  |
 | PD015 | use-of-pd-merge | Use `.merge` method instead of `pd.merge` function. They have equivalent functionality. |  |

crates/ruff/resources/test/fixtures/pandas_vet/fixes.py

@@ -0,0 +1,14 @@
+import pandas as pd 
+
+df = pd.DataFrame()
+
+df.isnull()
+df.isna()
+df.notnull()
+df.notna()
+df.at[1]
+df.loc[1]
+df.iat[1]
+df.iloc[1]
+df.values
+df.to_numpy()

crates/ruff/src/rules/pandas_vet/fixes.rs

@@ -1,11 +1,11 @@
-use rustpython_parser::ast::{Expr, ExprKind, Keyword, Location};
+use rustpython_parser::ast::{Expr, ExprContext, ExprKind, Keyword, Location};
 
 use crate::ast::helpers;
 use crate::ast::types::Range;
 use crate::autofix::apply_fix;
 use crate::autofix::helpers::remove_argument;
 use crate::fix::Fix;
-use crate::source_code::Locator;
+use crate::source_code::{Locator, Stylist};
 
 fn match_name(expr: &Expr) -> Option<&str> {
     if let ExprKind::Call { func, .. } = &expr.node {
@@ -70,3 +70,17 @@ pub fn fix_inplace_argument(
         None
     }
 }
+
+/// Replace attribute with `attr`
+pub fn fix_attr(attr: &str, value: &Expr, stylist: &Stylist) -> String {
+    let stmt = Expr::new(
+        Location::default(),
+        Location::default(),
+        ExprKind::Attribute {
+            value: Box::new(value.clone()),
+            attr: attr.to_string(),
+            ctx: ExprContext::Store,
+        },
+    );
+    helpers::unparse_expr(&stmt, stylist)
+}

crates/ruff/src/rules/pandas_vet/mod.rs

@@ -250,6 +250,11 @@ mod tests {
     }
 
     #[test_case(Rule::UseOfInplaceArgument, Path::new("PD002.py"); "PD002")]
+    #[test_case(Rule::UseOfDotIsNull, Path::new("fixes.py"); "PD003")]
+    #[test_case(Rule::UseOfDotNotNull, Path::new("fixes.py"); "PD004")]
+    #[test_case(Rule::UseOfDotAt, Path::new("fixes.py"); "PD008")]
+    #[test_case(Rule::UseOfDotIat, Path::new("fixes.py"); "PD009")]
+    #[test_case(Rule::UseOfDotValues, Path::new("fixes.py"); "PD011")]
     fn rules(rule_code: Rule, path: &Path) -> Result<()> {
         let snapshot = format!("{}_{}", rule_code.code(), path.to_string_lossy());
         let diagnostics = test_path(

crates/ruff/src/rules/pandas_vet/rules/check_attr.rs

@@ -3,9 +3,11 @@ use rustpython_parser::ast::{ExprKind, Located};
 
 use crate::ast::types::{BindingKind, Range};
 use crate::checkers::ast::Checker;
+use crate::fix::Fix;
 use crate::registry::{Diagnostic, DiagnosticKind, Rule};
+use crate::rules::pandas_vet::fixes::fix_attr;
 use crate::rules::pandas_vet::helpers::is_dataframe_candidate;
-use crate::violation::Violation;
+use crate::violation::{AlwaysAutofixableViolation, Violation};
 
 define_violation!(
     pub struct UseOfDotIx;
@@ -20,31 +22,43 @@ impl Violation for UseOfDotIx {
 define_violation!(
     pub struct UseOfDotAt;
 );
-impl Violation for UseOfDotAt {
+impl AlwaysAutofixableViolation for UseOfDotAt {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("Use `.loc` instead of `.at`.  If speed is important, use numpy.")
     }
+
+    fn autofix_title(&self) -> String {
+        format!("Replace `.at` with `.loc`")
+    }
 }
 
 define_violation!(
     pub struct UseOfDotIat;
 );
-impl Violation for UseOfDotIat {
+impl AlwaysAutofixableViolation for UseOfDotIat {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("Use `.iloc` instead of `.iat`.  If speed is important, use numpy.")
     }
+
+    fn autofix_title(&self) -> String {
+        format!("Replace `.iat` with `.iloc`")
+    }
 }
 
 define_violation!(
     pub struct UseOfDotValues;
 );
-impl Violation for UseOfDotValues {
+impl AlwaysAutofixableViolation for UseOfDotValues {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("Use `.to_numpy()` instead of `.values`")
     }
+
+    fn autofix_title(&self) -> String {
+        format!("Replace `.values` with `.to_numpy()`")
+    }
 }
 
 pub fn check_attr(
@@ -94,7 +108,22 @@ pub fn check_attr(
         }
     }
 
-    checker
-        .diagnostics
-        .push(Diagnostic::new(violation, Range::from_located(attr_expr)));
+    let mut diagnostic = Diagnostic::new(violation, Range::from_located(attr_expr));
+    if checker.patch(diagnostic.kind.rule()) {
+        let replacement = match *diagnostic.kind.rule() {
+            Rule::UseOfDotAt => Some("loc"),
+            Rule::UseOfDotIat => Some("iloc"),
+            Rule::UseOfDotValues => Some("to_numpy()"),
+            _ => None,
+        };
+        if let Some(replacement) = replacement {
+            diagnostic.amend(Fix::replacement(
+                fix_attr(replacement, value, checker.stylist),
+                attr_expr.location,
+                attr_expr.end_location.unwrap(),
+            ));
+        }
+    }
+
+    checker.diagnostics.push(diagnostic);
 }

crates/ruff/src/rules/pandas_vet/rules/check_call.rs

@@ -3,28 +3,38 @@ use rustpython_parser::ast::{ExprKind, Located};
 
 use crate::ast::types::{BindingKind, Range};
 use crate::checkers::ast::Checker;
+use crate::fix::Fix;
 use crate::registry::{Diagnostic, DiagnosticKind, Rule};
+use crate::rules::pandas_vet::fixes::fix_attr;
 use crate::rules::pandas_vet::helpers::is_dataframe_candidate;
-use crate::violation::Violation;
+use crate::violation::{AlwaysAutofixableViolation, Violation};
 
 define_violation!(
     pub struct UseOfDotIsNull;
 );
-impl Violation for UseOfDotIsNull {
+impl AlwaysAutofixableViolation for UseOfDotIsNull {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("`.isna` is preferred to `.isnull`; functionality is equivalent")
     }
+
+    fn autofix_title(&self) -> String {
+        format!("Replace `.isnull` with `.isna`")
+    }
 }
 
 define_violation!(
     pub struct UseOfDotNotNull;
 );
-impl Violation for UseOfDotNotNull {
+impl AlwaysAutofixableViolation for UseOfDotNotNull {
     #[derive_message_formats]
     fn message(&self) -> String {
         format!("`.notna` is preferred to `.notnull`; functionality is equivalent")
     }
+
+    fn autofix_title(&self) -> String {
+        format!("Replace `.notnull` with `.notna`")
+    }
 }
 
 define_violation!(
@@ -102,7 +112,21 @@ pub fn check_call(checker: &mut Checker, func: &Located<ExprKind>) {
         }
     }
 
-    checker
-        .diagnostics
-        .push(Diagnostic::new(violation, Range::from_located(func)));
+    let mut diagnostic = Diagnostic::new(violation, Range::from_located(func));
+    if checker.patch(diagnostic.kind.rule()) {
+        let replacement = match *diagnostic.kind.rule() {
+            Rule::UseOfDotIsNull => Some("isna"),
+            Rule::UseOfDotNotNull => Some("notna"),
+            _ => None,
+        };
+        if let Some(replacement) = replacement {
+            diagnostic.amend(Fix::replacement(
+                fix_attr(replacement, value, checker.stylist),
+                func.location,
+                func.end_location.unwrap(),
+            ));
+        }
+    }
+
+    checker.diagnostics.push(diagnostic);
 }

crates/ruff/src/rules/pandas_vet/snapshots/ruff__rules__pandas_vet__tests__PD003_fixes.py.snap

@@ -0,0 +1,23 @@
+---
+source: crates/ruff/src/rules/pandas_vet/mod.rs
+expression: diagnostics
+---
+- kind:
+    UseOfDotIsNull: ~
+  location:
+    row: 5
+    column: 0
+  end_location:
+    row: 5
+    column: 9
+  fix:
+    content:
+      - df.isna
+    location:
+      row: 5
+      column: 0
+    end_location:
+      row: 5
+      column: 9
+  parent: ~
+

crates/ruff/src/rules/pandas_vet/snapshots/ruff__rules__pandas_vet__tests__PD004_fixes.py.snap

@@ -0,0 +1,23 @@
+---
+source: crates/ruff/src/rules/pandas_vet/mod.rs
+expression: diagnostics
+---
+- kind:
+    UseOfDotNotNull: ~
+  location:
+    row: 7
+    column: 0
+  end_location:
+    row: 7
+    column: 10
+  fix:
+    content:
+      - df.notna
+    location:
+      row: 7
+      column: 0
+    end_location:
+      row: 7
+      column: 10
+  parent: ~
+

crates/ruff/src/rules/pandas_vet/snapshots/ruff__rules__pandas_vet__tests__PD008_fixes.py.snap

@@ -0,0 +1,23 @@
+---
+source: crates/ruff/src/rules/pandas_vet/mod.rs
+expression: diagnostics
+---
+- kind:
+    UseOfDotAt: ~
+  location:
+    row: 9
+    column: 0
+  end_location:
+    row: 9
+    column: 5
+  fix:
+    content:
+      - df.loc
+    location:
+      row: 9
+      column: 0
+    end_location:
+      row: 9
+      column: 5
+  parent: ~
+

crates/ruff/src/rules/pandas_vet/snapshots/ruff__rules__pandas_vet__tests__PD009_fixes.py.snap

@@ -0,0 +1,23 @@
+---
+source: crates/ruff/src/rules/pandas_vet/mod.rs
+expression: diagnostics
+---
+- kind:
+    UseOfDotIat: ~
+  location:
+    row: 11
+    column: 0
+  end_location:
+    row: 11
+    column: 6
+  fix:
+    content:
+      - df.iloc
+    location:
+      row: 11
+      column: 0
+    end_location:
+      row: 11
+      column: 6
+  parent: ~
+

crates/ruff/src/rules/pandas_vet/snapshots/ruff__rules__pandas_vet__tests__PD011_fixes.py.snap

@@ -0,0 +1,23 @@
+---
+source: crates/ruff/src/rules/pandas_vet/mod.rs
+expression: diagnostics
+---
+- kind:
+    UseOfDotValues: ~
+  location:
+    row: 13
+    column: 0
+  end_location:
+    row: 13
+    column: 9
+  fix:
+    content:
+      - df.to_numpy()
+    location:
+      row: 13
+      column: 0
+    end_location:
+      row: 13
+      column: 9
+  parent: ~
+