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Do not fix NamedTuple calls containing both a list of fields and keywords #5799

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merged 7 commits into from
Jul 17, 2023
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Do not fix NamedTuple calls containing both a list of fields and keywords #5799

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7bdd8a8
Do not fix NamedTuple calls containing both a list of fields and keyw…
harupy Jul 16, 2023
37b9696
Keywords example
harupy Jul 16, 2023
25294a5
Fix test cases
harupy Jul 16, 2023
b136b46
Support keywords
harupy Jul 16, 2023
451d7a6
Fix comment
harupy Jul 16, 2023
a036ec7
Update snapshot
harupy Jul 16, 2023
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Truncate
charliermarsh Jul 17, 2023
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21 changes: 7 additions & 14 deletions crates/ruff/resources/test/fixtures/pyupgrade/UP014.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,23 +4,9 @@
# with complex annotations
MyType = NamedTuple("MyType", [("a", int), ("b", tuple[str, ...])])

# with default values as list
MyType = NamedTuple(
"MyType",
[("a", int), ("b", str), ("c", list[bool])],
defaults=["foo", [True]],
)

Comment on lines -7 to -13
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Removed NamedTuple calls that cause a runtime error.

# with namespace
MyType = typing.NamedTuple("MyType", [("a", int), ("b", str)])

# too many default values (OK)
MyType = NamedTuple(
"MyType",
[("a", int), ("b", str)],
defaults=[1, "bar", "baz"],
)

# invalid identifiers (OK)
MyType = NamedTuple("MyType", [("x-y", int), ("b", tuple[str, ...])])

Expand All @@ -29,3 +15,10 @@

# empty fields
MyType = typing.NamedTuple("MyType", [])

# keywords
MyType = typing.NamedTuple("MyType", a=int, b=tuple[str, ...])

# unfixable
MyType = typing.NamedTuple("MyType", [("a", int)], [("b", str)])
MyType = typing.NamedTuple("MyType", [("a", int)], b=str)
97 changes: 46 additions & 51 deletions crates/ruff/src/rules/pyupgrade/rules/convert_named_tuple_functional_to_class.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -93,11 +93,7 @@ fn match_named_tuple_assign<'a>(

/// Generate a `Stmt::AnnAssign` representing the provided property
/// definition.
fn create_property_assignment_stmt(
property: &str,
annotation: &Expr,
value: Option<&Expr>,
) -> Stmt {
fn create_property_assignment_stmt(property: &str, annotation: &Expr) -> Stmt {
ast::StmtAnnAssign {
target: Box::new(
ast::ExprName {
Expand All @@ -108,40 +104,15 @@ fn create_property_assignment_stmt(
.into(),
),
annotation: Box::new(annotation.clone()),
value: value.map(|value| Box::new(value.clone())),
value: None,
simple: true,
range: TextRange::default(),
}
.into()
}

/// Match the `defaults` keyword in a `NamedTuple(...)` call.
fn match_defaults(keywords: &[Keyword]) -> Result<&[Expr]> {
let defaults = keywords.iter().find(|keyword| {
if let Some(arg) = &keyword.arg {
arg == "defaults"
} else {
false
}
});
match defaults {
Some(defaults) => match &defaults.value {
Expr::List(ast::ExprList { elts, .. }) => Ok(elts),
Expr::Tuple(ast::ExprTuple { elts, .. }) => Ok(elts),
_ => bail!("Expected defaults to be `Expr::List` | `Expr::Tuple`"),
},
None => Ok(&[]),
}
}

/// Create a list of property assignments from the `NamedTuple` arguments.
fn create_properties_from_args(args: &[Expr], defaults: &[Expr]) -> Result<Vec<Stmt>> {
let Some(fields) = args.get(1) else {
let node = Stmt::Pass(ast::StmtPass {
range: TextRange::default(),
});
return Ok(vec![node]);
};
/// Create a list of property assignments from the `NamedTuple` fields argument.
fn create_properties_from_fields_arg(fields: &Expr) -> Result<Vec<Stmt>> {
let Expr::List(ast::ExprList { elts, .. }) = &fields else {
bail!("Expected argument to be `Expr::List`");
};
Expand All @@ -151,16 +122,8 @@ fn create_properties_from_args(args: &[Expr], defaults: &[Expr]) -> Result<Vec<S
});
return Ok(vec![node]);
}
let padded_defaults = if elts.len() >= defaults.len() {
std::iter::repeat(None)
.take(elts.len() - defaults.len())
.chain(defaults.iter().map(Some))
} else {
bail!("Defaults must be `None` or an iterable of at least the number of fields")
};
elts.iter()
.zip(padded_defaults)
.map(|(field, default)| {
.map(|field| {
let Expr::Tuple(ast::ExprTuple { elts, .. }) = &field else {
bail!("Expected `field` to be `Expr::Tuple`")
};
Expand All @@ -180,9 +143,21 @@ fn create_properties_from_args(args: &[Expr], defaults: &[Expr]) -> Result<Vec<S
if is_dunder(property) {
bail!("Cannot use dunder property name: {}", property)
}
Ok(create_property_assignment_stmt(
property, annotation, default,
))
Ok(create_property_assignment_stmt(property, annotation))
})
.collect()
}

/// Create a list of property assignments from the `NamedTuple` keyword arguments.
fn create_properties_from_keywords(keywords: &[Keyword]) -> Result<Vec<Stmt>> {
keywords
.iter()
.map(|keyword| {
let Keyword { arg, value, .. } = keyword;
let Some(arg) = arg else {
bail!("Expected `keyword` to have an `arg`")
};
Ok(create_property_assignment_stmt(arg.as_str(), value))
})
.collect()
}
Expand Down Expand Up @@ -228,12 +203,32 @@ pub(crate) fn convert_named_tuple_functional_to_class(
return;
};

let properties = match match_defaults(keywords)
.and_then(|defaults| create_properties_from_args(args, defaults))
{
Ok(properties) => properties,
Err(err) => {
debug!("Skipping `NamedTuple` \"{typename}\": {err}");
let properties = match (&args[1..], keywords) {
// Ex) NamedTuple("MyType")
([], []) => vec![Stmt::Pass(ast::StmtPass {
range: TextRange::default(),
})],
// Ex) NamedTuple("MyType", [("a", int), ("b", str)])
([fields], []) => {
if let Ok(properties) = create_properties_from_fields_arg(fields) {
properties
} else {
debug!("Skipping `NamedTuple` \"{typename}\": unable to parse fields");
return;
}
}
// Ex) NamedTuple("MyType", a=int, b=str)
([], keywords) => {
if let Ok(properties) = create_properties_from_keywords(keywords) {
properties
} else {
debug!("Skipping `NamedTuple` \"{typename}\": unable to parse keywords");
return;
}
}
// Unfixable
_ => {
debug!("Skipping `NamedTuple` \"{typename}\": mixed fields and keywords");
return;
}
};
Expand Down
126 changes: 61 additions & 65 deletions crates/ruff/src/rules/pyupgrade/snapshots/ruff__rules__pyupgrade__tests__UP014.py.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ UP014.py:5:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class s
5 | MyType = NamedTuple("MyType", [("a", int), ("b", tuple[str, ...])])
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP014
6 |
7 | # with default values as list
7 | # with namespace
|
= help: Convert `MyType` to class syntax

Expand All @@ -20,97 +20,93 @@ UP014.py:5:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class s
6 |+ a: int
7 |+ b: tuple[str, ...]
6 8 |
7 9 | # with default values as list
8 10 | MyType = NamedTuple(
7 9 | # with namespace
8 10 | MyType = typing.NamedTuple("MyType", [("a", int), ("b", str)])

UP014.py:8:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class syntax
|
7 | # with default values as list
8 | / MyType = NamedTuple(
9 | | "MyType",
10 | | [("a", int), ("b", str), ("c", list[bool])],
11 | | defaults=["foo", [True]],
12 | | )
| |_^ UP014
13 |
14 | # with namespace
7 | # with namespace
8 | MyType = typing.NamedTuple("MyType", [("a", int), ("b", str)])
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP014
9 |
10 | # invalid identifiers (OK)
|
= help: Convert `MyType` to class syntax

ℹ Suggested fix
5 5 | MyType = NamedTuple("MyType", [("a", int), ("b", tuple[str, ...])])
6 6 |
7 7 | # with default values as list
8 |-MyType = NamedTuple(
9 |- "MyType",
10 |- [("a", int), ("b", str), ("c", list[bool])],
11 |- defaults=["foo", [True]],
12 |-)
8 |+class MyType(NamedTuple):
7 7 | # with namespace
8 |-MyType = typing.NamedTuple("MyType", [("a", int), ("b", str)])
8 |+class MyType(typing.NamedTuple):
9 |+ a: int
10 |+ b: str = "foo"
11 |+ c: list[bool] = [True]
13 12 |
14 13 | # with namespace
15 14 | MyType = typing.NamedTuple("MyType", [("a", int), ("b", str)])
10 |+ b: str
9 11 |
10 12 | # invalid identifiers (OK)
11 13 | MyType = NamedTuple("MyType", [("x-y", int), ("b", tuple[str, ...])])

UP014.py:15:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class syntax
UP014.py:14:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class syntax
|
14 | # with namespace
15 | MyType = typing.NamedTuple("MyType", [("a", int), ("b", str)])
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP014
16 |
17 | # too many default values (OK)
13 | # no fields
14 | MyType = typing.NamedTuple("MyType")
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP014
15 |
16 | # empty fields
|
= help: Convert `MyType` to class syntax

ℹ Suggested fix
12 12 | )
13 13 |
14 14 | # with namespace
15 |-MyType = typing.NamedTuple("MyType", [("a", int), ("b", str)])
15 |+class MyType(typing.NamedTuple):
16 |+ a: int
17 |+ b: str
16 18 |
17 19 | # too many default values (OK)
18 20 | MyType = NamedTuple(
11 11 | MyType = NamedTuple("MyType", [("x-y", int), ("b", tuple[str, ...])])
12 12 |
13 13 | # no fields
14 |-MyType = typing.NamedTuple("MyType")
14 |+class MyType(typing.NamedTuple):
15 |+ pass
15 16 |
16 17 | # empty fields
17 18 | MyType = typing.NamedTuple("MyType", [])

UP014.py:28:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class syntax
UP014.py:17:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class syntax
|
27 | # no fields
28 | MyType = typing.NamedTuple("MyType")
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP014
29 |
30 | # empty fields
16 | # empty fields
17 | MyType = typing.NamedTuple("MyType", [])
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP014
18 |
19 | # keywords
|
= help: Convert `MyType` to class syntax

ℹ Suggested fix
25 25 | MyType = NamedTuple("MyType", [("x-y", int), ("b", tuple[str, ...])])
26 26 |
27 27 | # no fields
28 |-MyType = typing.NamedTuple("MyType")
28 |+class MyType(typing.NamedTuple):
29 |+ pass
29 30 |
30 31 | # empty fields
31 32 | MyType = typing.NamedTuple("MyType", [])
14 14 | MyType = typing.NamedTuple("MyType")
15 15 |
16 16 | # empty fields
17 |-MyType = typing.NamedTuple("MyType", [])
17 |+class MyType(typing.NamedTuple):
18 |+ pass
18 19 |
19 20 | # keywords
20 21 | MyType = typing.NamedTuple("MyType", a=int, b=tuple[str, ...])

UP014.py:31:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class syntax
UP014.py:20:1: UP014 [*] Convert `MyType` from `NamedTuple` functional to class syntax
|
30 | # empty fields
31 | MyType = typing.NamedTuple("MyType", [])
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP014
19 | # keywords
20 | MyType = typing.NamedTuple("MyType", a=int, b=tuple[str, ...])
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ UP014
21 |
22 | # unfixable
|
= help: Convert `MyType` to class syntax

ℹ Suggested fix
28 28 | MyType = typing.NamedTuple("MyType")
29 29 |
30 30 | # empty fields
31 |-MyType = typing.NamedTuple("MyType", [])
31 |+class MyType(typing.NamedTuple):
32 |+ pass
17 17 | MyType = typing.NamedTuple("MyType", [])
18 18 |
19 19 | # keywords
20 |-MyType = typing.NamedTuple("MyType", a=int, b=tuple[str, ...])
20 |+class MyType(typing.NamedTuple):
21 |+ a: int
22 |+ b: tuple[str, ...]
21 23 |
22 24 | # unfixable
23 25 | MyType = typing.NamedTuple("MyType", [("a", int)], [("b", str)])


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