tests/structured_conf: default_factory for mutable dataclass args

python3.11 no longer supports the use of mutable default arguments in
dataclasses. https://docs.python.org/3/whatsnew/3.11.html#dataclasses

tests/__init__.py

@@ -108,7 +108,7 @@ class ConcretePlugin(Plugin):
     class FoobarParams:
         foo: int = 10
 
-    params: FoobarParams = FoobarParams()
+    params: FoobarParams = field(default_factory=FoobarParams)
 
 
 @dataclass
@@ -117,7 +117,7 @@ class NestedInterpolationToMissing:
     class BazParams:
         baz: str = "${..name}"
 
-    subcfg: BazParams = BazParams()
+    subcfg: BazParams = field(default_factory=BazParams)
     name: str = MISSING
 
 

tests/examples/test_dataclass_example.py

@@ -161,7 +161,9 @@ class Group:
     admin: User = User  # type: ignore
 
     # You can also specify different defaults for nested classes
-    manager: User = User(name="manager", height=Height.TALL)
+    manager: User = field(
+        default_factory=lambda: User(name="manager", height=Height.TALL)
+    )
 
 
 def test_nesting() -> None:
@@ -343,7 +345,7 @@ def test_merge() -> None:
     @dataclass
     class Config:
         num: int = 10
-        user: User = User(name=MISSING, height=MISSING)
+        user: User = field(default_factory=lambda: User(name=MISSING, height=MISSING))
         domains: Dict[str, Domain] = field(default_factory=dict)
 
     yaml = """
@@ -385,8 +387,8 @@ class Log:
 
     @dataclass
     class MyConfig:
-        server: Server = Server()
-        log: Log = Log()
+        server: Server = field(default_factory=Server)
+        log: Log = field(default_factory=Log)
         users: List[str] = field(default_factory=list)
         numbers: List[int] = field(default_factory=list)
 

tests/structured_conf/data/dataclasses.py

@@ -34,7 +34,7 @@ class TypedDictSubclass(TypedDict):
 
 @dataclass
 class StructuredWithInvalidField:
-    bar: NotStructuredConfig = NotStructuredConfig()
+    bar: NotStructuredConfig = field(default_factory=NotStructuredConfig)
 
 
 @dataclass
@@ -75,7 +75,7 @@ class OptionalUser:
 
 @dataclass
 class InterpolationToUser:
-    user: User = User("Bond", 7)
+    user: User = field(default_factory=lambda: User("Bond", 7))
     admin: User = II("user")
 
 
@@ -251,14 +251,16 @@ class NestedConfig:
     default_value: Nested
 
     # with default value
-    user_provided_default: Nested = Nested(with_default=42)
+    user_provided_default: Nested = field(
+        default_factory=lambda: Nested(with_default=42)
+    )
 
     value_at_root: int = 1000
 
 
 @dataclass
 class NestedWithAny:
-    var: Any = Nested()
+    var: Any = field(default_factory=Nested)
 
 
 @dataclass
@@ -349,14 +351,14 @@ class RecursiveDict:
 
 @dataclass
 class StructuredOptional:
-    with_default: Optional[Nested] = Nested()
+    with_default: Optional[Nested] = field(default_factory=Nested)
     as_none: Optional[Nested] = None
-    not_optional: Nested = Nested()
+    not_optional: Nested = field(default_factory=Nested)
 
 
 @dataclass(frozen=True)
 class FrozenClass:
-    user: User = User(name="Bart", age=10)
+    user: User = field(default_factory=lambda: User(name="Bart", age=10))
     x: int = 10
     list: List[int] = field(default_factory=lambda: [1, 2, 3])
 
@@ -522,7 +524,7 @@ class Str2IntWithStrField(Dict[str, int]):
 
     @dataclass
     class Str2UserWithField(Dict[str, User]):
-        foo: User = User("Bond", 7)
+        foo: User = field(default_factory=lambda: User("Bond", 7))
 
     class Error:
         @dataclass
@@ -544,7 +546,7 @@ class ConcretePlugin(Plugin):
     class FoobarParams:
         foo: int = 10
 
-    params: FoobarParams = FoobarParams()
+    params: FoobarParams = field(default_factory=FoobarParams)
 
 
 @dataclass
@@ -563,8 +565,8 @@ class FaultyPlugin:
 class PluginHolder:
     none: Optional[Plugin] = None
     missing: Plugin = MISSING
-    plugin: Plugin = Plugin()
-    plugin2: Plugin = ConcretePlugin()
+    plugin: Plugin = field(default_factory=Plugin)
+    plugin2: Plugin = field(default_factory=ConcretePlugin)
 
 
 @dataclass
@@ -585,7 +587,9 @@ class Missing1:
 
     @dataclass
     class Missing2:
-        head: LinkedList = LinkedList(next=MISSING, value=1)
+        head: LinkedList = field(
+            default_factory=lambda: LinkedList(next=MISSING, value=1)
+        )
 
 
 @dataclass

tests/test_utils.py

@@ -300,7 +300,7 @@ class _TestAttrsClass:
 
 @dataclass
 class _TestDataclassIllegalValue:
-    x: Any = IllegalType()
+    x: Any = field(default_factory=IllegalType)
 
 
 @attr.s(auto_attribs=True)