update deps

pyproject.toml

@@ -35,8 +35,8 @@ classifiers = [
 dependencies = [
     'importlib-metadata; python_version<"3.9"',
     'packaging',
-    'pydantic',
-    'runtype'
+    'frozendict',
+    'typeguard'
 ]
 dynamic = ["version"]
 

src/dabmodel/__init__.py

@@ -12,6 +12,7 @@ Main module __init__ file.
 
 from .__metadata__ import __version__, __Summuary__, __Name__
 from .model import (
+    DABFieldInfo,
     BaseAppliance,
     BaseFeature,
     DABModelException,
@@ -24,4 +25,6 @@ from .model import (
     InvalidFieldValue,
     InvalidFieldAnnotation,
     IncompletelyAnnotatedField,
+    ImportForbidden,
+    FunctionForbidden,
 )

src/dabmodel/model.py

@@ -1,10 +1,10 @@
 from typing import Optional, TypeVar, Generic, Union, get_origin, get_args, List, Dict, Any, Tuple, Set, Annotated, FrozenSet
-from types import UnionType
+from types import UnionType, FunctionType, SimpleNamespace
 from frozendict import deepfreeze
 from copy import deepcopy, copy
 from pprint import pprint
-
 from typeguard import check_type, TypeCheckError, CollectionCheckStrategy
+import math
 
 ALLOWED_ANNOTATIONS = {
     "Union": Union,
@@ -55,6 +55,9 @@ class NewFieldForbidden(DABModelException): ...
 class InvalidFieldAnnotation(DABModelException): ...
 
 
+class InvalidInitializerType(DABModelException): ...
+
+
 class NotAnnotatedField(InvalidFieldAnnotation): ...
 
 
@@ -67,6 +70,67 @@ class ReadOnlyFieldAnnotation(DABModelException): ...
 class InvalidFieldValue(DABModelException): ...
 
 
+class NonExistingField(DABModelException): ...
+
+
+class ImportForbidden(DABModelException): ...
+
+
+class FunctionForbidden(DABModelException): ...
+
+
+ALLOWED_HELPERS_MATH = SimpleNamespace(
+    sqrt=math.sqrt,
+    floor=math.floor,
+    ceil=math.ceil,
+    trunc=math.trunc,
+    fabs=math.fabs,
+    copysign=math.copysign,
+    hypot=math.hypot,
+    exp=math.exp,
+    log=math.log,
+    log10=math.log10,
+    sin=math.sin,
+    cos=math.cos,
+    tan=math.tan,
+    atan2=math.atan2,
+    radians=math.radians,
+    degrees=math.degrees,
+)
+
+ALLOWED_HELPERS_DEFAULT = {
+    "math": ALLOWED_HELPERS_MATH,
+    "print": print,
+    # Numbers & reducers (pure, deterministic)
+    "abs": abs,
+    "round": round,
+    "min": min,
+    "max": max,
+    "sum": sum,
+    # Introspection-free basics
+    "len": len,
+    "sorted": sorted,
+    # Basic constructors (for copy-on-write patterns)
+    "tuple": tuple,
+    "list": list,
+    "dict": dict,
+    "set": set,
+    # Simple casts if they need to normalize types
+    "int": int,
+    "float": float,
+    "str": str,
+    "bool": bool,
+    "bytes": bytes,
+    "complex": complex,
+    # Easy iteration helpers (optional but handy)
+    "range": range,
+}
+
+
+def _blocked_import(*args, **kwargs):
+    raise ImportForbidden("imports disabled in __initializer")
+
+
 def _resolve_annotation(ann):
     if isinstance(ann, str):
         # Safe eval against a **whitelist** only
@@ -88,36 +152,50 @@ def _peel_annotated(t: Any) -> Any:
             return t
 
 
-def __check_annotation_definition__(_type) -> bool:
+def _check_annotation_definition(_type) -> bool:
     _type = _peel_annotated(_type)
     # handle Optional[] and Union[None,...]
     if (get_origin(_type) is Union or get_origin(_type) is UnionType) and type(None) in get_args(_type):
-        return all([__check_annotation_definition__(_) for _ in get_args(_type) if _ is not type(None)])
+        return all([_check_annotation_definition(_) for _ in get_args(_type) if _ is not type(None)])
 
     # handle other Union[...]
     if get_origin(_type) is Union or get_origin(_type) is UnionType:
-        return all([__check_annotation_definition__(_) for _ in get_args(_type)])
+        return all([_check_annotation_definition(_) for _ in get_args(_type)])
 
     # handle Dict[...]
     if get_origin(_type) is dict:
         inner = get_args(_type)
         if len(inner) != 2:
             raise IncompletelyAnnotatedField(f"Dict Annotation requires 2 inner definitions: {_type}")
-        return _peel_annotated(inner[0]) in ALLOWED_MODEL_FIELDS_TYPES and __check_annotation_definition__(inner[1])
+        return _peel_annotated(inner[0]) in ALLOWED_MODEL_FIELDS_TYPES and _check_annotation_definition(inner[1])
+
+    # handle Tuple[]
+    if get_origin(_type) in [tuple]:
+        inner_types = get_args(_type)
+        if len(inner_types) == 0:
+            raise IncompletelyAnnotatedField(f"Annotation requires inner definition: {_type}")
+        if len(inner_types) == 2 and inner_types[1] is Ellipsis:
+            return _check_annotation_definition(inner_types[0])
+        return all([_check_annotation_definition(_) for _ in inner_types])
 
     # handle Set[],Tuple[],FrozenSet[],List[]
     if get_origin(_type) in [set, frozenset, tuple, list]:
         inner_types = get_args(_type)
         if len(inner_types) == 0:
             raise IncompletelyAnnotatedField(f"Annotation requires inner definition: {_type}")
-        return all([__check_annotation_definition__(_) for _ in inner_types])
+        return all([_check_annotation_definition(_) for _ in inner_types])
 
     if _type in ALLOWED_MODEL_FIELDS_TYPES:
         return True
     return False
 
 
-class Constraint: ...
+class BaseConstraint(Generic[TV_ALLOWED_MODEL_FIELDS_TYPES]):
+    _bound_type: type
+
+    def __init__(self): ...
+
+    def check(self, value: TV_ALLOWED_MODEL_FIELDS_TYPES) -> bool: ...
 
 
 def _deepfreeze(value):
@@ -132,38 +210,136 @@ def _deepfreeze(value):
     return value
 
 
+class DABFieldInfo:
+    def __init__(self, *, doc: str = "", constraints: list[BaseConstraint] = []):
+        self._doc: str = doc
+        self._constraints: list[BaseConstraint] = constraints
+
+    @property
+    def doc(self):
+        return self._doc
+
+    @property
+    def constraints(self):
+        return self._constraints
+
+
 class DABField(Generic[TV_ALLOWED_MODEL_FIELDS_TYPES]):
-    def __init__(self, name: str, v: Optional[TV_ALLOWED_MODEL_FIELDS_TYPES], a: Any):
-        self._constraints: List[Constraint] = []
+    def __init__(self, name: str, v: Optional[TV_ALLOWED_MODEL_FIELDS_TYPES], a: Any, i: str):
         self._name: str = name
         self._source: Optional[type] = None
         self._default_value: Optional[TV_ALLOWED_MODEL_FIELDS_TYPES] = v
         self._value: Optional[TV_ALLOWED_MODEL_FIELDS_TYPES] = v
         self._annotations: Any = a
-        self._documentation: str = ""
-
-    def add_documentation(self, d: str) -> None:
-        self._documentation = d
+        self._info: DABFieldInfo = i
+        self._constraints: List[BaseConstraint] = i.constraints
 
     def add_source(self, s: type) -> None:
         self._source = s
 
-    def add_constraint(self, c: Constraint) -> None:
+    @property
+    def doc(self):
+        return self._info.doc
+
+    def add_constraint(self, c: BaseConstraint) -> None:
         self._constraints.append(c)
 
+    @property
+    def constraints(self) -> list[BaseConstraint]:
+        return self._info.constraints
+
+    @property
+    def default_value(self):
+        return _deepfreeze(self._default_value)
+
     def update_value(self, v: Optional[TV_ALLOWED_MODEL_FIELDS_TYPES] = None) -> None:
         self._value = v
 
-    def render(self) -> TV_ALLOWED_MODEL_FIELDS_TYPES:
+    @property
+    def value(self):
         return _deepfreeze(self._value)
 
-    def render_default(self) -> TV_ALLOWED_MODEL_FIELDS_TYPES:
-        return _deepfreeze(self._default_value)
+    @property
+    def raw_value(self):
+        return self._value
 
-    def get_annotation(self) -> Any:
+    @property
+    def annotations(self) -> Any:
         return self._annotations
 
 
+class FrozenDABField(Generic[TV_ALLOWED_MODEL_FIELDS_TYPES]):
+    def __init__(self, inner_field: DABField):
+        self._inner_field = inner_field
+
+    @property
+    def doc(self):
+        return self._inner_field.doc
+
+    @property
+    def constraints(self):
+        return _deepfreeze(self._inner_field.constraints)
+
+    @property
+    def default_value(self):
+        return self._inner_field.default_value
+
+    @property
+    def value(self):
+        return self._inner_field.value
+
+    @property
+    def annotations(self) -> Any:
+        return _deepfreeze(self._inner_field.annotations)
+
+
+class ModelSpecView:
+    __slots__ = ("_vals", "_types", "_touched", "_name", "_module")
+
+    def __init__(self, values: dict, types_map: dict[str, type], name, module):
+        object.__setattr__(self, "_vals", dict(values))
+        object.__setattr__(self, "_types", types_map)
+        object.__setattr__(self, "_touched", set())
+        object.__setattr__(self, "_name", name)
+        object.__setattr__(self, "_module", module)
+
+    @property
+    def __name__(self) -> str:
+        return self._name
+
+    @property
+    def __module__(self) -> str:
+        return self._module
+
+    def __getattr__(self, name):
+        if name not in self._types:
+            raise AttributeError(f"Unknown field {name}")
+        return self._vals[name]
+
+    def __setattr__(self, name, value):
+        if name not in self._types:
+            raise NonExistingField(f"Cannot set unknown field {name}")
+        T = self._types[name]
+
+        try:
+            check_type(
+                value,
+                T,
+                collection_check_strategy=CollectionCheckStrategy.ALL_ITEMS,
+            )
+        except TypeCheckError as exp:
+            raise InvalidFieldValue(f"Field <{name}> value is not of expected type {T}.") from exp
+
+        self._vals[name] = value
+        self._touched.add(name)
+
+    def export(self) -> dict:
+        return dict(self._vals)
+
+    def diff(self) -> dict:
+        return {k: self._vals[k] for k in self._touched}
+
+
 class BaseMeta(type):
     def __new__(mcls, name, bases, namespace):
         # print("__NEW__ Defining:", name, "with keys:", list(namespace))
@@ -187,23 +363,30 @@ class BaseMeta(type):
         # iterating new and modified fields
         modified_field: Dict[str, Any] = {}
         new_fields: Dict[str, DABField] = {}
+        initializer: Optional[type] = None
+        initializer_name: Optional[str] = None
         for _fname, _fvalue in namespace.items():
-            if _fname.startswith("__"):
+            if _fname == f"_{name}__initializer" or (name.startswith("_") and _fname == "__initializer"):
+                if not isinstance(_fvalue, classmethod):
+                    raise InvalidInitializerType()
+                initializer = _fvalue.__func__
+                if name.startswith("_"):
+                    initializer_name = "__initializer"
+                else:
+                    initializer_name = f"_{name}__initializer"
+            elif _fname.startswith("__"):
                 pass
-            elif _fname == "Constraints" and type(_fvalue) is type:
-                ...
-                # print("FOUND Constraints")
             else:
                 # print(f"Parsing Field: {_fname} / {_fvalue}")
                 # Modified fields
                 if len(bases) == 1 and _fname in namespace["__DABSchema__"].keys():
                     # print(f"Modified field: {_fname}")
-                    if _fname in namespace["__annotations__"]:
+                    if "__annotations__" in namespace and _fname in namespace["__annotations__"]:
                         raise ReadOnlyFieldAnnotation("annotations cannot be modified on derived classes")
                     try:
                         check_type(
                             _fvalue,
-                            namespace["__DABSchema__"][_fname].get_annotation(),
+                            namespace["__DABSchema__"][_fname].annotations,
                             collection_check_strategy=CollectionCheckStrategy.ALL_ITEMS,
                         )
                     except TypeCheckError as exp:
@@ -225,9 +408,22 @@ class BaseMeta(type):
                     if isinstance(namespace["__annotations__"][_fname], str):
                         namespace["__annotations__"][_fname] = _resolve_annotation(namespace["__annotations__"][_fname])
 
-                    if not __check_annotation_definition__(namespace["__annotations__"][_fname]):
+                    if not _check_annotation_definition(namespace["__annotations__"][_fname]):
                         raise InvalidFieldAnnotation(f"Field <{_fname}> has not an allowed or valid annotation.")
 
+                    _finfo: Optional[DABFieldInfo] = DABFieldInfo()
+                    origin = get_origin(namespace["__annotations__"][_fname])
+                    tname = getattr(origin, "__name__", "") or getattr(origin, "__qualname__", "") or str(origin)
+                    if "Annotated" in tname:
+                        args = get_args(namespace["__annotations__"][_fname])
+                        if args:
+                            if len(args) > 2:
+                                raise InvalidFieldAnnotation(f"Field <{_fname}> had invalid Annotated value.")
+                            if len(args) == 2 and not isinstance(args[1], DABFieldInfo):
+                                raise InvalidFieldAnnotation(f"Only DABFieldInfo object is allowed as Annotated data.")
+
+                            _finfo = args[1]
+
                     # print(f"annotation is: {namespace['__annotations__'][_fname]}")
                     # check if value is valid
                     try:
@@ -238,14 +434,15 @@ class BaseMeta(type):
                         raise InvalidFieldValue(
                             f"Value of Field <{_fname}> is not of expected type {namespace['__annotations__'][_fname]}."
                         ) from exp
-                    new_fields[_fname] = DABField(_fname, _fvalue, namespace["__annotations__"][_fname])
-                    # namespace[_fname].add_documentation()
+                    new_fields[_fname] = DABField(_fname, _fvalue, namespace["__annotations__"][_fname], _finfo)
 
         # removing modified fields from class (will add them back later)
         for _fname in new_fields.keys():
             del namespace[_fname]
         for _fname in modified_field.keys():
             del namespace[_fname]
+        if initializer is not None:
+            del namespace[initializer_name]
 
         orig_setattr = namespace.get("__setattr__", object.__setattr__)
 
@@ -273,15 +470,44 @@ class BaseMeta(type):
             _fvalue.add_source(cls)
             cls.__DABSchema__[_fname] = _fvalue
 
+        if initializer is not None:
+            init_fieldvalues = dict()
+            init_fieldtypes = dict()
+            for _fname, _fvalue in cls.__DABSchema__.items():
+                init_fieldvalues[_fname] = deepcopy(_fvalue.raw_value)
+                init_fieldtypes[_fname] = _fvalue.annotations
+            fakecls = ModelSpecView(init_fieldvalues, init_fieldtypes, cls.__name__, cls.__module__)
+            safe_globals = {"__builtins__": {"__import__": _blocked_import}, **ALLOWED_HELPERS_DEFAULT}
+            if initializer.__code__.co_freevars:
+                raise FunctionForbidden("__initializer must not use closures")
+            safe_initializer = FunctionType(
+                initializer.__code__,
+                safe_globals,
+                name=initializer.__name__,
+                argdefs=initializer.__defaults__,
+                closure=None,
+            )
+            safe_initializer(fakecls)
+            print(fakecls.diff())
+            for _fname, _fvalue in fakecls.export().items():
+                try:
+                    check_type(_fvalue, cls.__DABSchema__[_fname].annotations, collection_check_strategy=CollectionCheckStrategy.ALL_ITEMS)
+                except TypeCheckError as exp:
+                    raise InvalidFieldValue(
+                        f"Value of Field <{_fname}> is not of expected type {namespace['__annotations__'][_fname]}."
+                    ) from exp
+                cls.__DABSchema__[_fname].update_value(_fvalue)
         return cls
 
     def __call__(cls, *args, **kw):
         obj = super().__call__(*args, **kw)
 
         for _fname in cls.__DABSchema__.keys():
-            setattr(obj, _fname, cls.__DABSchema__[_fname].render())
-        # obj.__DABSchema__ = deepfreeze(obj.__DABSchema__)
-        # setattr(obj, "__DABSchema__", deepfreeze(obj.__DABSchema__))
+            setattr(obj, _fname, cls.__DABSchema__[_fname].value)
+        inst_schema = dict()
+        for _fname, _fvalue in cls.__DABSchema__.items():
+            inst_schema[_fname] = FrozenDABField(_fvalue)
+        setattr(obj, "__DABSchema__", inst_schema)
         return obj
 
 

test/test_model.py

@@ -26,6 +26,10 @@ testdir_path = Path(__file__).parent.resolve()
 chdir(testdir_path.parent.resolve())
 
 
+def test_initializer_safe_testfc():
+    eval("print('hi')")
+
+
 class TestConfigWithoutEnabledFlag(unittest.TestCase):
     def setUp(self):
         print("\n->", unittest.TestCase.id(self))
@@ -175,13 +179,6 @@ class TestConfigWithoutEnabledFlag(unittest.TestCase):
             class _(dm.BaseAppliance):
                 _ = "default value"
 
-    def test_annotated(self):
-        """Testing first appliance level, and Field types (annotated one)"""
-
-        # class can be created if annotation is a string
-        class Appliance1(dm.BaseAppliance):
-            StrVar: Annotated[str, "my string"] = "default value"
-
     def test_optionnal(self):
         """Testing first appliance level, and Field types (Optionnal annotations)"""
 
@@ -492,6 +489,7 @@ class TestConfigWithoutEnabledFlag(unittest.TestCase):
             testVar4: "Tuple[str,...]" = ("a", "c")
             testVar5: tuple[str, ...] = ("a", "b")
             testVar6: "tuple[str,...]" = ("a", "b")
+            testVar7: Tuple[int, str] = (1, "b")
             # testVar7: Tuple[Union[int, str]] = (1, 2, 3, "one", "two", "three")
 
         app1 = Appliance1()
@@ -502,7 +500,7 @@ class TestConfigWithoutEnabledFlag(unittest.TestCase):
         self.immutable_vars__test_field(app1, "testVar4", ("a", "c"), ("h", "e"))
         self.immutable_vars__test_field(app1, "testVar5", ("a", "b"), ("h", "c"))
         self.immutable_vars__test_field(app1, "testVar6", ("a", "b"), ("h", "c"))
-        # self.immutable_vars__test_field(app1, "testVar7", (1, 2, 3, "one", "two", "three"), ("h", "c"))
+        self.immutable_vars__test_field(app1, "testVar7", (1, "b"), (7, "h"))
 
         # must work
         sorted(app1.testVar)
@@ -527,6 +525,653 @@ class TestConfigWithoutEnabledFlag(unittest.TestCase):
             class _(dm.BaseAppliance):
                 _: "Tuple" = (1, 2)
 
+        with self.assertRaises(dm.InvalidFieldValue):
+
+            class _(dm.BaseAppliance):
+                _: "Tuple[int,...]" = (1, "a")
+
+        with self.assertRaises(dm.InvalidFieldValue):
+
+            class _(dm.BaseAppliance):
+                _: "tuple[int,...]" = (1, "a")
+
+    def check_immutable_fields_schema(
+        self, appliance: dm.BaseAppliance, field_name: str, expected_value: str, expected_default_value: str, expected_type: type
+    ):
+        self.assertIn(field_name, appliance.__DABSchema__)
+        self.assertIn("doc", dir(appliance.__DABSchema__[field_name]))
+        self.assertEqual(appliance.__DABSchema__[field_name].doc, "")
+        self.assertIn("annotations", dir(appliance.__DABSchema__[field_name]))
+        self.assertEqual(appliance.__DABSchema__[field_name].annotations, expected_type)
+        self.assertIn("value", dir(appliance.__DABSchema__[field_name]))
+        self.assertEqual(appliance.__DABSchema__[field_name].value, expected_value)
+        self.assertIn("default_value", dir(appliance.__DABSchema__[field_name]))
+        self.assertEqual(appliance.__DABSchema__[field_name].default_value, expected_default_value)
+        self.assertIn("constraints", dir(appliance.__DABSchema__[field_name]))
+        self.assertEqual(appliance.__DABSchema__[field_name].constraints, ())
+
+    def test_immutable_fields_schema(self):
+        """Testing first appliance level, and Field types (annotated)"""
+
+        # class can be created
+        class Appliance1(dm.BaseAppliance):
+            StrVar: "str" = "default value"
+            StrVar2: "str" = "default value2"
+            VarInt: "int" = 12
+            VarInt2: "int" = 21
+            VarFloat: "float" = 12.1
+            VarFloat2: "float" = 21.2
+            VarComplex: "complex" = complex(3, 5)
+            VarComplex2: "complex" = complex(8, 6)
+            VarBool: "bool" = True
+            VarBool2: "bool" = False
+            VarBytes: "bytes" = bytes.fromhex("2Ef0 F1f2  ")
+            VarBytes2: "bytes" = bytes.fromhex("2ff0 F7f2  ")
+
+        app1 = Appliance1()
+
+        self.assertIn("__DABSchema__", dir(app1))
+        self.assertIn("__DABSchema__", app1.__dict__)
+
+        self.check_immutable_fields_schema(app1, "StrVar", "default value", "default value", str)
+        self.check_immutable_fields_schema(app1, "StrVar2", "default value2", "default value2", str)
+        self.check_immutable_fields_schema(app1, "VarInt", 12, 12, int)
+        self.check_immutable_fields_schema(app1, "VarInt2", 21, 21, int)
+        self.check_immutable_fields_schema(app1, "VarFloat", 12.1, 12.1, float)
+        self.check_immutable_fields_schema(app1, "VarFloat2", 21.2, 21.2, float)
+        self.check_immutable_fields_schema(app1, "VarComplex", complex(3, 5), complex(3, 5), complex)
+        self.check_immutable_fields_schema(app1, "VarComplex2", complex(8, 6), complex(8, 6), complex)
+        self.check_immutable_fields_schema(app1, "VarBool", True, True, bool)
+        self.check_immutable_fields_schema(app1, "VarBool2", False, False, bool)
+        self.check_immutable_fields_schema(app1, "VarBytes", bytes.fromhex("2Ef0 F1f2  "), bytes.fromhex("2Ef0 F1f2  "), bytes)
+        self.check_immutable_fields_schema(app1, "VarBytes2", bytes.fromhex("2ff0 F7f2  "), bytes.fromhex("2ff0 F7f2  "), bytes)
+
+    def test_container_field_schema(self):
+        """Testing first appliance level, and Field types (annotated)"""
+
+        # class can be created
+        class Appliance1(dm.BaseAppliance):
+            ListStr: list[str] = ["val1", "val2"]
+            ListStr2: "list[str]" = ["val3", "val4"]
+            Dict1: dict[int, float] = {1: 1.1, 4: 7.6, 91: 23.6}
+            Dict2: "dict[str, str]" = {"1": "1.1", "4": "7.6", "91": "23.6"}
+            Tuple1: "tuple[str,...]" = ("a", "c")
+            Tuple2: tuple[str, ...] = ("a", "b")
+            FrozenSet1: frozenset[int] = frozenset({1, 2})
+            FrozenSet2: "frozenset[int]" = frozenset({1, 2})
+            Set1: set[int] = set({1, 2})
+            Set2: "set[int]" = set({1, 2})
+
+        app1 = Appliance1()
+
+        self.assertIn("__DABSchema__", dir(app1))
+        self.assertIn("__DABSchema__", app1.__dict__)
+
+        self.check_immutable_fields_schema(app1, "ListStr", ("val1", "val2"), ("val1", "val2"), list[str])
+        self.check_immutable_fields_schema(app1, "ListStr2", ("val3", "val4"), ("val3", "val4"), list[str])
+        self.check_immutable_fields_schema(app1, "Dict1", {1: 1.1, 4: 7.6, 91: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6}, dict[int, float])
+        self.check_immutable_fields_schema(
+            app1, "Dict2", {"1": "1.1", "4": "7.6", "91": "23.6"}, {"1": "1.1", "4": "7.6", "91": "23.6"}, dict[str, str]
+        )
+        self.check_immutable_fields_schema(app1, "Tuple1", ("a", "c"), ("a", "c"), tuple[str, ...])
+        self.check_immutable_fields_schema(app1, "Tuple2", ("a", "b"), ("a", "b"), tuple[str, ...])
+        self.check_immutable_fields_schema(app1, "FrozenSet1", frozenset({1, 2}), frozenset({1, 2}), frozenset[int])
+        self.check_immutable_fields_schema(app1, "FrozenSet2", frozenset({1, 2}), frozenset({1, 2}), frozenset[int])
+        self.check_immutable_fields_schema(app1, "Set1", frozenset({1, 2}), frozenset({1, 2}), set[int])
+        self.check_immutable_fields_schema(app1, "Set2", frozenset({1, 2}), frozenset({1, 2}), set[int])
+
+        # same test with Typing types (list -> List ...)
+        # class can be created
+        class Appliance1(dm.BaseAppliance):
+            ListStr: List[str] = ["val1", "val2"]
+            ListStr2: "List[str]" = ["val3", "val4"]
+            Dict1: Dict[int, float] = {1: 1.1, 4: 7.6, 91: 23.6}
+            Dict2: "Dict[str, str]" = {"1": "1.1", "4": "7.6", "91": "23.6"}
+            Tuple1: "Tuple[str,...]" = ("a", "c")
+            Tuple2: Tuple[str, ...] = ("a", "b")
+            FrozenSet1: FrozenSet[int] = frozenset({1, 2})
+            FrozenSet2: "FrozenSet[int]" = frozenset({1, 2})
+            Set1: Set[int] = set({1, 2})
+            Set2: "Set[int]" = set({1, 2})
+
+        app1 = Appliance1()
+
+        self.assertIn("__DABSchema__", dir(app1))
+        self.assertIn("__DABSchema__", app1.__dict__)
+
+        self.check_immutable_fields_schema(app1, "ListStr", ("val1", "val2"), ("val1", "val2"), List[str])
+        self.check_immutable_fields_schema(app1, "ListStr2", ("val3", "val4"), ("val3", "val4"), List[str])
+        self.check_immutable_fields_schema(app1, "Dict1", {1: 1.1, 4: 7.6, 91: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6}, Dict[int, float])
+        self.check_immutable_fields_schema(
+            app1, "Dict2", {"1": "1.1", "4": "7.6", "91": "23.6"}, {"1": "1.1", "4": "7.6", "91": "23.6"}, Dict[str, str]
+        )
+        self.check_immutable_fields_schema(app1, "Tuple1", ("a", "c"), ("a", "c"), Tuple[str, ...])
+        self.check_immutable_fields_schema(app1, "Tuple2", ("a", "b"), ("a", "b"), Tuple[str, ...])
+        self.check_immutable_fields_schema(app1, "FrozenSet1", frozenset({1, 2}), frozenset({1, 2}), FrozenSet[int])
+        self.check_immutable_fields_schema(app1, "FrozenSet2", frozenset({1, 2}), frozenset({1, 2}), FrozenSet[int])
+        self.check_immutable_fields_schema(app1, "Set1", frozenset({1, 2}), frozenset({1, 2}), Set[int])
+        self.check_immutable_fields_schema(app1, "Set2", frozenset({1, 2}), frozenset({1, 2}), Set[int])
+
+    def test_immutable_fields_annotated(self):
+        """Testing first appliance level, and Field types (annotated)"""
+
+        # class can be created
+        class Appliance1(dm.BaseAppliance):
+            StrVar: Annotated[str, dm.DABFieldInfo(doc="foo1")] = "default value"
+            StrVar2: Annotated[str, dm.DABFieldInfo(doc="foo2")] = "default value2"
+            VarInt: Annotated[int, dm.DABFieldInfo(doc="foo3")] = 12
+            VarInt2: Annotated[int, dm.DABFieldInfo(doc="foo4")] = 21
+            VarFloat: Annotated[float, dm.DABFieldInfo(doc="foo5")] = 12.1
+            VarFloat2: Annotated[float, dm.DABFieldInfo(doc="foo6")] = 21.2
+            VarComplex: Annotated[complex, dm.DABFieldInfo(doc="foo7")] = complex(3, 5)
+            VarComplex2: Annotated[complex, dm.DABFieldInfo(doc="foo8")] = complex(8, 6)
+            VarBool: Annotated[bool, dm.DABFieldInfo(doc="foo9")] = True
+            VarBool2: Annotated[bool, dm.DABFieldInfo(doc="foo10")] = False
+            VarBytes: Annotated[bytes, dm.DABFieldInfo(doc="foo11")] = bytes.fromhex("2Ef0 F1f2  ")
+            VarBytes2: Annotated[bytes, dm.DABFieldInfo(doc="foo12")] = bytes.fromhex("2ff0 F7f2  ")
+
+        app1 = Appliance1()
+
+        self.immutable_vars__test_field(app1, "StrVar", "default value", "test")
+        self.assertEqual(app1.__DABSchema__["StrVar"].doc, "foo1")
+        self.immutable_vars__test_field(app1, "StrVar2", "default value2", "test2")
+        self.assertEqual(app1.__DABSchema__["StrVar2"].doc, "foo2")
+        self.immutable_vars__test_field(app1, "VarInt", 12, 13)
+        self.assertEqual(app1.__DABSchema__["VarInt"].doc, "foo3")
+        self.immutable_vars__test_field(app1, "VarInt2", 21, 22)
+        self.assertEqual(app1.__DABSchema__["VarInt2"].doc, "foo4")
+        self.immutable_vars__test_field(app1, "VarFloat", 12.1, 32)
+        self.assertEqual(app1.__DABSchema__["VarFloat"].doc, "foo5")
+        self.immutable_vars__test_field(app1, "VarFloat2", 21.2, 42)
+        self.assertEqual(app1.__DABSchema__["VarFloat2"].doc, "foo6")
+        self.immutable_vars__test_field(app1, "VarComplex", complex(3, 5), complex(1, 2))
+        self.assertEqual(app1.__DABSchema__["VarComplex"].doc, "foo7")
+        self.immutable_vars__test_field(app1, "VarComplex2", complex(8, 6), complex(3, 2))
+        self.assertEqual(app1.__DABSchema__["VarComplex2"].doc, "foo8")
+        self.immutable_vars__test_field(app1, "VarBool", True, False)
+        self.assertEqual(app1.__DABSchema__["VarBool"].doc, "foo9")
+        self.immutable_vars__test_field(app1, "VarBool2", False, True)
+        self.assertEqual(app1.__DABSchema__["VarBool2"].doc, "foo10")
+        self.immutable_vars__test_field(app1, "VarBytes", bytes.fromhex("2Ef0 F1f2  "), bytes.fromhex("11f0 F1f2  "))
+        self.assertEqual(app1.__DABSchema__["VarBytes"].doc, "foo11")
+        self.immutable_vars__test_field(app1, "VarBytes2", bytes.fromhex("2ff0 F7f2  "), bytes.fromhex("11f0 F1e2  "))
+        self.assertEqual(app1.__DABSchema__["VarBytes2"].doc, "foo12")
+
+        with self.assertRaises(dm.InvalidFieldAnnotation):
+
+            class _(dm.BaseAppliance):
+                _: Annotated[str, "foo2"] = "default value2"
+
+        # annotation is parsed before the library can do anything, so the exception can only be TypeError
+        with self.assertRaises(TypeError):
+
+            class _(dm.BaseAppliance):
+                _: Annotated[str] = "default value2"
+
+    def test_immutable_fields_inheritance(self):
+        """Testing first appliance level, and Field types (simple)"""
+
+        # class can be created
+        class Appliance1(dm.BaseAppliance):
+            StrVar: str = "default value"
+            StrVar2: str = "default value2"
+            VarInt: int = 12
+            VarInt2: int = 21
+            VarFloat: float = 12.1
+            VarFloat2: float = 21.2
+            VarComplex: complex = complex(3, 5)
+            VarComplex2: complex = complex(8, 6)
+            VarBool: bool = True
+            VarBool2: bool = False
+            VarBytes: bytes = bytes.fromhex("2Ef0 F1f2  ")
+            VarBytes2: bytes = bytes.fromhex("2ff0 F7f2  ")
+
+        class Appliance2(Appliance1):
+            StrVar = "moded value"
+            StrVar2 = "moded value2"
+            VarInt = 54
+            VarInt2 = 23
+            VarFloat = 2.6
+            VarFloat2 = 1.5
+            VarComplex = complex(7, 1)
+            VarComplex2 = complex(3, 0)
+            VarBool = False
+            VarBool2 = True
+            VarBytes = bytes.fromhex("21f0 e1f2  ")
+            VarBytes2 = bytes.fromhex("2df0 F672  ")
+
+        app1 = Appliance1()
+
+        self.immutable_vars__test_field(app1, "StrVar", "default value", "test")
+        self.immutable_vars__test_field(app1, "StrVar2", "default value2", "test2")
+        self.immutable_vars__test_field(app1, "VarInt", 12, 13)
+        self.immutable_vars__test_field(app1, "VarInt2", 21, 22)
+        self.immutable_vars__test_field(app1, "VarFloat", 12.1, 32)
+        self.immutable_vars__test_field(app1, "VarFloat2", 21.2, 42)
+        self.immutable_vars__test_field(app1, "VarComplex", complex(3, 5), complex(1, 2))
+        self.immutable_vars__test_field(app1, "VarComplex2", complex(8, 6), complex(3, 2))
+        self.immutable_vars__test_field(app1, "VarBool", True, False)
+        self.immutable_vars__test_field(app1, "VarBool2", False, True)
+        self.immutable_vars__test_field(app1, "VarBytes", bytes.fromhex("2Ef0 F1f2  "), bytes.fromhex("11f0 F1f2  "))
+        self.immutable_vars__test_field(app1, "VarBytes2", bytes.fromhex("2ff0 F7f2  "), bytes.fromhex("11f0 F1e2  "))
+
+        self.check_immutable_fields_schema(app1, "StrVar", "default value", "default value", str)
+        self.check_immutable_fields_schema(app1, "StrVar2", "default value2", "default value2", str)
+        self.check_immutable_fields_schema(app1, "VarInt", 12, 12, int)
+        self.check_immutable_fields_schema(app1, "VarInt2", 21, 21, int)
+        self.check_immutable_fields_schema(app1, "VarFloat", 12.1, 12.1, float)
+        self.check_immutable_fields_schema(app1, "VarFloat2", 21.2, 21.2, float)
+        self.check_immutable_fields_schema(app1, "VarComplex", complex(3, 5), complex(3, 5), complex)
+        self.check_immutable_fields_schema(app1, "VarComplex2", complex(8, 6), complex(8, 6), complex)
+        self.check_immutable_fields_schema(app1, "VarBool", True, True, bool)
+        self.check_immutable_fields_schema(app1, "VarBool2", False, False, bool)
+        self.check_immutable_fields_schema(app1, "VarBytes", bytes.fromhex("2Ef0 F1f2  "), bytes.fromhex("2Ef0 F1f2  "), bytes)
+        self.check_immutable_fields_schema(app1, "VarBytes2", bytes.fromhex("2ff0 F7f2  "), bytes.fromhex("2ff0 F7f2  "), bytes)
+
+        app2 = Appliance2()
+
+        self.immutable_vars__test_field(app2, "StrVar", "moded value", "test")
+        self.immutable_vars__test_field(app2, "StrVar2", "moded value2", "test2")
+        self.immutable_vars__test_field(app2, "VarInt", 54, 13)
+        self.immutable_vars__test_field(app2, "VarInt2", 23, 22)
+        self.immutable_vars__test_field(app2, "VarFloat", 2.6, 32)
+        self.immutable_vars__test_field(app2, "VarFloat2", 1.5, 42)
+        self.immutable_vars__test_field(app2, "VarComplex", complex(7, 1), complex(1, 2))
+        self.immutable_vars__test_field(app2, "VarComplex2", complex(3, 0), complex(3, 2))
+        self.immutable_vars__test_field(app2, "VarBool", False, False)
+        self.immutable_vars__test_field(app2, "VarBool2", True, True)
+        self.immutable_vars__test_field(app2, "VarBytes", bytes.fromhex("21f0 e1f2  "), bytes.fromhex("11f0 F1f2  "))
+        self.immutable_vars__test_field(app2, "VarBytes2", bytes.fromhex("2df0 F672  "), bytes.fromhex("11f0 F1e2  "))
+
+        self.check_immutable_fields_schema(app2, "StrVar", "moded value", "default value", str)
+        self.check_immutable_fields_schema(app2, "StrVar2", "moded value2", "default value2", str)
+        self.check_immutable_fields_schema(app2, "VarInt", 54, 12, int)
+        self.check_immutable_fields_schema(app2, "VarInt2", 23, 21, int)
+        self.check_immutable_fields_schema(app2, "VarFloat", 2.6, 12.1, float)
+        self.check_immutable_fields_schema(app2, "VarFloat2", 1.5, 21.2, float)
+        self.check_immutable_fields_schema(app2, "VarComplex", complex(7, 1), complex(3, 5), complex)
+        self.check_immutable_fields_schema(app2, "VarComplex2", complex(3, 0), complex(8, 6), complex)
+        self.check_immutable_fields_schema(app2, "VarBool", False, True, bool)
+        self.check_immutable_fields_schema(app2, "VarBool2", True, False, bool)
+        self.check_immutable_fields_schema(app2, "VarBytes", bytes.fromhex("21f0 e1f2  "), bytes.fromhex("2Ef0 F1f2  "), bytes)
+        self.check_immutable_fields_schema(app2, "VarBytes2", bytes.fromhex("2df0 F672  "), bytes.fromhex("2ff0 F7f2  "), bytes)
+
+        class Appliance3(Appliance2):
+            NewValue: str = "newval"
+
+        self.assertNotIn("NewValue", Appliance2.__DABSchema__)
+        self.assertNotIn("NewValue", app2.__DABSchema__)
+        self.assertNotIn("NewValue", Appliance1.__DABSchema__)
+        self.assertNotIn("NewValue", app1.__DABSchema__)
+
+        app3 = Appliance3()
+        self.immutable_vars__test_field(app3, "StrVar", "moded value", "test")
+        self.immutable_vars__test_field(app3, "StrVar2", "moded value2", "test2")
+        self.immutable_vars__test_field(app3, "VarInt", 54, 13)
+        self.immutable_vars__test_field(app3, "VarInt2", 23, 22)
+        self.immutable_vars__test_field(app3, "VarFloat", 2.6, 32)
+        self.immutable_vars__test_field(app3, "VarFloat2", 1.5, 42)
+        self.immutable_vars__test_field(app3, "VarComplex", complex(7, 1), complex(1, 2))
+        self.immutable_vars__test_field(app3, "VarComplex2", complex(3, 0), complex(3, 2))
+        self.immutable_vars__test_field(app3, "VarBool", False, False)
+        self.immutable_vars__test_field(app3, "VarBool2", True, True)
+        self.immutable_vars__test_field(app3, "VarBytes", bytes.fromhex("21f0 e1f2  "), bytes.fromhex("11f0 F1f2  "))
+        self.immutable_vars__test_field(app3, "VarBytes2", bytes.fromhex("2df0 F672  "), bytes.fromhex("11f0 F1e2  "))
+        self.immutable_vars__test_field(app3, "NewValue", "newval", "test")
+
+        self.check_immutable_fields_schema(app3, "StrVar", "moded value", "default value", str)
+        self.check_immutable_fields_schema(app3, "StrVar2", "moded value2", "default value2", str)
+        self.check_immutable_fields_schema(app3, "VarInt", 54, 12, int)
+        self.check_immutable_fields_schema(app3, "VarInt2", 23, 21, int)
+        self.check_immutable_fields_schema(app3, "VarFloat", 2.6, 12.1, float)
+        self.check_immutable_fields_schema(app3, "VarFloat2", 1.5, 21.2, float)
+        self.check_immutable_fields_schema(app3, "VarComplex", complex(7, 1), complex(3, 5), complex)
+        self.check_immutable_fields_schema(app3, "VarComplex2", complex(3, 0), complex(8, 6), complex)
+        self.check_immutable_fields_schema(app3, "VarBool", False, True, bool)
+        self.check_immutable_fields_schema(app3, "VarBool2", True, False, bool)
+        self.check_immutable_fields_schema(app3, "VarBytes", bytes.fromhex("21f0 e1f2  "), bytes.fromhex("2Ef0 F1f2  "), bytes)
+        self.check_immutable_fields_schema(app3, "VarBytes2", bytes.fromhex("2df0 F672  "), bytes.fromhex("2ff0 F7f2  "), bytes)
+        self.check_immutable_fields_schema(app3, "NewValue", "newval", "newval", str)
+
+        self.immutable_vars__test_field(app1, "StrVar", "default value", "test")
+        self.immutable_vars__test_field(app1, "StrVar2", "default value2", "test2")
+        self.immutable_vars__test_field(app1, "VarInt", 12, 13)
+        self.immutable_vars__test_field(app1, "VarInt2", 21, 22)
+        self.immutable_vars__test_field(app1, "VarFloat", 12.1, 32)
+        self.immutable_vars__test_field(app1, "VarFloat2", 21.2, 42)
+        self.immutable_vars__test_field(app1, "VarComplex", complex(3, 5), complex(1, 2))
+        self.immutable_vars__test_field(app1, "VarComplex2", complex(8, 6), complex(3, 2))
+        self.immutable_vars__test_field(app1, "VarBool", True, False)
+        self.immutable_vars__test_field(app1, "VarBool2", False, True)
+        self.immutable_vars__test_field(app1, "VarBytes", bytes.fromhex("2Ef0 F1f2  "), bytes.fromhex("11f0 F1f2  "))
+        self.immutable_vars__test_field(app1, "VarBytes2", bytes.fromhex("2ff0 F7f2  "), bytes.fromhex("11f0 F1e2  "))
+
+        self.check_immutable_fields_schema(app1, "StrVar", "default value", "default value", str)
+        self.check_immutable_fields_schema(app1, "StrVar2", "default value2", "default value2", str)
+        self.check_immutable_fields_schema(app1, "VarInt", 12, 12, int)
+        self.check_immutable_fields_schema(app1, "VarInt2", 21, 21, int)
+        self.check_immutable_fields_schema(app1, "VarFloat", 12.1, 12.1, float)
+        self.check_immutable_fields_schema(app1, "VarFloat2", 21.2, 21.2, float)
+        self.check_immutable_fields_schema(app1, "VarComplex", complex(3, 5), complex(3, 5), complex)
+        self.check_immutable_fields_schema(app1, "VarComplex2", complex(8, 6), complex(8, 6), complex)
+        self.check_immutable_fields_schema(app1, "VarBool", True, True, bool)
+        self.check_immutable_fields_schema(app1, "VarBool2", False, False, bool)
+        self.check_immutable_fields_schema(app1, "VarBytes", bytes.fromhex("2Ef0 F1f2  "), bytes.fromhex("2Ef0 F1f2  "), bytes)
+        self.check_immutable_fields_schema(app1, "VarBytes2", bytes.fromhex("2ff0 F7f2  "), bytes.fromhex("2ff0 F7f2  "), bytes)
+
+        self.immutable_vars__test_field(app2, "StrVar", "moded value", "test")
+        self.immutable_vars__test_field(app2, "StrVar2", "moded value2", "test2")
+        self.immutable_vars__test_field(app2, "VarInt", 54, 13)
+        self.immutable_vars__test_field(app2, "VarInt2", 23, 22)
+        self.immutable_vars__test_field(app2, "VarFloat", 2.6, 32)
+        self.immutable_vars__test_field(app2, "VarFloat2", 1.5, 42)
+        self.immutable_vars__test_field(app2, "VarComplex", complex(7, 1), complex(1, 2))
+        self.immutable_vars__test_field(app2, "VarComplex2", complex(3, 0), complex(3, 2))
+        self.immutable_vars__test_field(app2, "VarBool", False, False)
+        self.immutable_vars__test_field(app2, "VarBool2", True, True)
+        self.immutable_vars__test_field(app2, "VarBytes", bytes.fromhex("21f0 e1f2  "), bytes.fromhex("11f0 F1f2  "))
+        self.immutable_vars__test_field(app2, "VarBytes2", bytes.fromhex("2df0 F672  "), bytes.fromhex("11f0 F1e2  "))
+
+        self.check_immutable_fields_schema(app2, "StrVar", "moded value", "default value", str)
+        self.check_immutable_fields_schema(app2, "StrVar2", "moded value2", "default value2", str)
+        self.check_immutable_fields_schema(app2, "VarInt", 54, 12, int)
+        self.check_immutable_fields_schema(app2, "VarInt2", 23, 21, int)
+        self.check_immutable_fields_schema(app2, "VarFloat", 2.6, 12.1, float)
+        self.check_immutable_fields_schema(app2, "VarFloat2", 1.5, 21.2, float)
+        self.check_immutable_fields_schema(app2, "VarComplex", complex(7, 1), complex(3, 5), complex)
+        self.check_immutable_fields_schema(app2, "VarComplex2", complex(3, 0), complex(8, 6), complex)
+        self.check_immutable_fields_schema(app2, "VarBool", False, True, bool)
+        self.check_immutable_fields_schema(app2, "VarBool2", True, False, bool)
+        self.check_immutable_fields_schema(app2, "VarBytes", bytes.fromhex("21f0 e1f2  "), bytes.fromhex("2Ef0 F1f2  "), bytes)
+        self.check_immutable_fields_schema(app2, "VarBytes2", bytes.fromhex("2df0 F672  "), bytes.fromhex("2ff0 F7f2  "), bytes)
+
+        with self.assertRaises(dm.ReadOnlyFieldAnnotation):
+
+            class _(Appliance1):
+                StrVar: int = 12
+
+        with self.assertRaises(dm.ReadOnlyFieldAnnotation):
+
+            class _(Appliance3):
+                NewValue: int = 12
+
+        with self.assertRaises(dm.ReadOnlyFieldAnnotation):
+
+            class _(Appliance3):
+                StrVar: int = 12
+
+    def test_containers_field_inheritance(self):
+        """Testing first appliance level, and Field types (annotated)"""
+
+        # class can be created
+        class Appliance1(dm.BaseAppliance):
+            ListStr: list[str] = ["val1", "val2"]
+            Dict1: dict[int, float] = {1: 1.1, 4: 7.6, 91: 23.6}
+            Tuple1: "tuple[str,...]" = ("a", "c")
+            FrozenSet1: frozenset[int] = frozenset({1, 2})
+            Set1: set[int] = set({1, 2})
+
+        # class can be created
+        class Appliance2(Appliance1):
+            ListStr = ["mod val1", "mod val2"]
+            Dict1 = {4: 1.1, 9: 7.6, 51: 23.6}
+            Tuple1 = ("aa", "cc")
+            FrozenSet1 = frozenset({14, 27})
+            Set1 = set({1, 20})
+
+        app1 = Appliance1()
+
+        self.immutable_vars__test_field(app1, "ListStr", ("val1", "val2"), ["val2", "val3"])
+        self.immutable_vars__test_field(app1, "Dict1", {1: 1.1, 4: 7.6, 91: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6})
+        self.immutable_vars__test_field(app1, "Tuple1", ("a", "c"), ("h", "r"))
+        self.immutable_vars__test_field(app1, "FrozenSet1", frozenset({1, 2}), frozenset({4, 0}))
+        self.immutable_vars__test_field(app1, "Set1", frozenset({1, 2}), set({4, 0}))
+
+        self.check_immutable_fields_schema(app1, "ListStr", ("val1", "val2"), ("val1", "val2"), list[str])
+        self.check_immutable_fields_schema(app1, "Dict1", {1: 1.1, 4: 7.6, 91: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6}, dict[int, float])
+        self.check_immutable_fields_schema(app1, "Tuple1", ("a", "c"), ("a", "c"), tuple[str, ...])
+        self.check_immutable_fields_schema(app1, "FrozenSet1", frozenset({1, 2}), frozenset({1, 2}), frozenset[int])
+        self.check_immutable_fields_schema(app1, "Set1", frozenset({1, 2}), frozenset({1, 2}), set[int])
+
+        app2 = Appliance2()
+
+        self.immutable_vars__test_field(app2, "ListStr", ("mod val1", "mod val2"), ["val2", "val3"])
+        self.immutable_vars__test_field(app2, "Dict1", {4: 1.1, 9: 7.6, 51: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6})
+        self.immutable_vars__test_field(app2, "Tuple1", ("aa", "cc"), ("h", "r"))
+        self.immutable_vars__test_field(app2, "FrozenSet1", frozenset({14, 27}), frozenset({4, 0}))
+        self.immutable_vars__test_field(app2, "Set1", frozenset({1, 20}), set({4, 0}))
+
+        self.check_immutable_fields_schema(app2, "ListStr", ("mod val1", "mod val2"), ("val1", "val2"), list[str])
+        self.check_immutable_fields_schema(app2, "Dict1", {4: 1.1, 9: 7.6, 51: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6}, dict[int, float])
+        self.check_immutable_fields_schema(app2, "Tuple1", ("aa", "cc"), ("a", "c"), tuple[str, ...])
+        self.check_immutable_fields_schema(app2, "FrozenSet1", frozenset({14, 27}), frozenset({1, 2}), frozenset[int])
+        self.check_immutable_fields_schema(app2, "Set1", frozenset({1, 20}), frozenset({1, 2}), set[int])
+
+        self.immutable_vars__test_field(app1, "ListStr", ("val1", "val2"), ["val2", "val3"])
+        self.immutable_vars__test_field(app1, "Dict1", {1: 1.1, 4: 7.6, 91: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6})
+        self.immutable_vars__test_field(app1, "Tuple1", ("a", "c"), ("h", "r"))
+        self.immutable_vars__test_field(app1, "FrozenSet1", frozenset({1, 2}), frozenset({4, 0}))
+        self.immutable_vars__test_field(app1, "Set1", frozenset({1, 2}), set({4, 0}))
+
+        self.check_immutable_fields_schema(app1, "ListStr", ("val1", "val2"), ("val1", "val2"), list[str])
+        self.check_immutable_fields_schema(app1, "Dict1", {1: 1.1, 4: 7.6, 91: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6}, dict[int, float])
+        self.check_immutable_fields_schema(app1, "Tuple1", ("a", "c"), ("a", "c"), tuple[str, ...])
+        self.check_immutable_fields_schema(app1, "FrozenSet1", frozenset({1, 2}), frozenset({1, 2}), frozenset[int])
+        self.check_immutable_fields_schema(app1, "Set1", frozenset({1, 2}), frozenset({1, 2}), set[int])
+
+        # class can be created
+        class Appliance3(Appliance2):
+            ListStr2: list[str] = ["mod val3", "mod val3"]
+            Dict2: dict[int, float] = {9: 8.1, 5: 98.6, 551: 3.6}
+            Tuple2: "tuple[str,...]" = ("aaa", "ccc")
+            FrozenSet2: frozenset[int] = frozenset({114, 127})
+            Set2: set[int] = set({10, 250})
+
+        app3 = Appliance3()
+
+        self.immutable_vars__test_field(app3, "ListStr", ("mod val1", "mod val2"), ["val2", "val3"])
+        self.immutable_vars__test_field(app3, "Dict1", {4: 1.1, 9: 7.6, 51: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6})
+        self.immutable_vars__test_field(app3, "Tuple1", ("aa", "cc"), ("h", "r"))
+        self.immutable_vars__test_field(app3, "FrozenSet1", frozenset({14, 27}), frozenset({4, 0}))
+        self.immutable_vars__test_field(app3, "Set1", frozenset({1, 20}), set({4, 0}))
+
+        self.immutable_vars__test_field(app3, "ListStr2", ("mod val3", "mod val3"), ["mod val3", "mod val3"])
+        self.immutable_vars__test_field(app3, "Dict2", {9: 8.1, 5: 98.6, 551: 3.6}, {9: 8.1, 5: 98.6, 551: 3.6})
+        self.immutable_vars__test_field(app3, "Tuple2", ("aaa", "ccc"), ("aaa", "ccc"))
+        self.immutable_vars__test_field(app3, "FrozenSet2", frozenset({114, 127}), frozenset({114, 127}))
+        self.immutable_vars__test_field(app3, "Set2", frozenset({10, 250}), set({10, 250}))
+
+        self.check_immutable_fields_schema(app3, "ListStr", ("mod val1", "mod val2"), ("val1", "val2"), list[str])
+        self.check_immutable_fields_schema(app3, "Dict1", {4: 1.1, 9: 7.6, 51: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6}, dict[int, float])
+        self.check_immutable_fields_schema(app3, "Tuple1", ("aa", "cc"), ("a", "c"), tuple[str, ...])
+        self.check_immutable_fields_schema(app3, "FrozenSet1", frozenset({14, 27}), frozenset({1, 2}), frozenset[int])
+        self.check_immutable_fields_schema(app3, "Set1", frozenset({1, 20}), frozenset({1, 2}), set[int])
+
+        self.check_immutable_fields_schema(app3, "ListStr2", ("mod val3", "mod val3"), ("mod val3", "mod val3"), list[str])
+        self.check_immutable_fields_schema(app3, "Dict2", {9: 8.1, 5: 98.6, 551: 3.6}, {9: 8.1, 5: 98.6, 551: 3.6}, dict[int, float])
+        self.check_immutable_fields_schema(app3, "Tuple2", ("aaa", "ccc"), ("aaa", "ccc"), tuple[str, ...])
+        self.check_immutable_fields_schema(app3, "FrozenSet2", frozenset({114, 127}), frozenset({114, 127}), frozenset[int])
+        self.check_immutable_fields_schema(app3, "Set2", frozenset({10, 250}), frozenset({10, 250}), set[int])
+
+        self.immutable_vars__test_field(app2, "ListStr", ("mod val1", "mod val2"), ["val2", "val3"])
+        self.immutable_vars__test_field(app2, "Dict1", {4: 1.1, 9: 7.6, 51: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6})
+        self.immutable_vars__test_field(app2, "Tuple1", ("aa", "cc"), ("h", "r"))
+        self.immutable_vars__test_field(app2, "FrozenSet1", frozenset({14, 27}), frozenset({4, 0}))
+        self.immutable_vars__test_field(app2, "Set1", frozenset({1, 20}), set({4, 0}))
+
+        self.check_immutable_fields_schema(app2, "ListStr", ("mod val1", "mod val2"), ("val1", "val2"), list[str])
+        self.check_immutable_fields_schema(app2, "Dict1", {4: 1.1, 9: 7.6, 51: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6}, dict[int, float])
+        self.check_immutable_fields_schema(app2, "Tuple1", ("aa", "cc"), ("a", "c"), tuple[str, ...])
+        self.check_immutable_fields_schema(app2, "FrozenSet1", frozenset({14, 27}), frozenset({1, 2}), frozenset[int])
+        self.check_immutable_fields_schema(app2, "Set1", frozenset({1, 20}), frozenset({1, 2}), set[int])
+
+        self.immutable_vars__test_field(app1, "ListStr", ("val1", "val2"), ["val2", "val3"])
+        self.immutable_vars__test_field(app1, "Dict1", {1: 1.1, 4: 7.6, 91: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6})
+        self.immutable_vars__test_field(app1, "Tuple1", ("a", "c"), ("h", "r"))
+        self.immutable_vars__test_field(app1, "FrozenSet1", frozenset({1, 2}), frozenset({4, 0}))
+        self.immutable_vars__test_field(app1, "Set1", frozenset({1, 2}), set({4, 0}))
+
+        self.check_immutable_fields_schema(app1, "ListStr", ("val1", "val2"), ("val1", "val2"), list[str])
+        self.check_immutable_fields_schema(app1, "Dict1", {1: 1.1, 4: 7.6, 91: 23.6}, {1: 1.1, 4: 7.6, 91: 23.6}, dict[int, float])
+        self.check_immutable_fields_schema(app1, "Tuple1", ("a", "c"), ("a", "c"), tuple[str, ...])
+        self.check_immutable_fields_schema(app1, "FrozenSet1", frozenset({1, 2}), frozenset({1, 2}), frozenset[int])
+        self.check_immutable_fields_schema(app1, "Set1", frozenset({1, 2}), frozenset({1, 2}), set[int])
+
+    def test_initializer(self):
+        """Testing first appliance level, and Field types (simple)"""
+
+        # class can be created
+        class Appliance1(dm.BaseAppliance):
+            VarInt: int = 12
+            VarInt2: int = 21
+            list1: list[int] = [1]
+            set1: set[float] = {1.43}
+            set2: set[float] = {5.43}
+            VarStr1: str = "abcd"
+
+            @classmethod
+            def __initializer(cls):
+
+                cls.VarInt2 = cls.VarInt + 1
+                cls.list1.append(2)
+                cls.set2 = cls.set1 | {1234}
+                cls.set1 = {0}
+                cls.VarStr1 = cls.VarStr1.upper()
+
+        app1 = Appliance1()
+
+        self.assertEquals(app1.VarInt, 12)
+        self.assertEquals(app1.VarInt2, 13)
+        self.assertEquals(app1.set1, frozenset({0}))
+        self.assertEquals(app1.set2, frozenset((1.43, 1234)))
+        self.assertEquals(app1.VarStr1, "ABCD")
+
+        # class can be created
+        class _(dm.BaseAppliance):
+            VarInt: int = 41
+
+            @classmethod
+            def __initializer(cls):
+
+                cls.VarInt = cls.VarInt + 1
+
+        app2 = _()
+        self.assertEquals(app2.VarInt, 42)
+
+    def test_initializer_safe(self):
+
+        with self.assertRaises(dm.ImportForbidden):
+
+            class test(dm.BaseAppliance):
+                _: int = 0
+
+                @classmethod
+                def __initializer(cls):
+                    import pprint
+
+        with self.assertRaises(NameError):
+
+            class _(dm.BaseAppliance):
+                _: int = 0
+
+                @classmethod
+                def __initializer(cls):
+                    eval("2 ** 8")
+
+        with self.assertRaises(NameError):
+
+            class _(dm.BaseAppliance):
+                _: int = 0
+
+                @classmethod
+                def __initializer(cls):
+                    open("foo")
+
+        with self.assertRaises(NameError):
+
+            class _(dm.BaseAppliance):
+                _: int = 0
+
+                @classmethod
+                def __initializer(cls):
+                    exec("exit()")
+
+        with self.assertRaises(NameError):
+
+            class _(dm.BaseAppliance):
+                _: int = 0
+
+                @classmethod
+                def __initializer(cls):
+                    compile("print(55)", "test", "eval")
+
+        with self.assertRaises(NameError):
+
+            class _(dm.BaseAppliance):
+                _: int = 0
+
+                @classmethod
+                def __initializer(cls):
+                    compile("print(55)", "test", "eval")
+
+        with self.assertRaises(dm.FunctionForbidden):
+
+            def testfc():
+                eval("print('test')")
+
+            class _(dm.BaseAppliance):
+                _: int = 0
+
+                @classmethod
+                def __initializer(cls):
+                    testfc()
+
+        # class can be created
+        class Appliance2(dm.BaseAppliance):
+            VarInt: int = -56
+            VarInt2: int = 0
+            VarInt3: int = 0
+            VarInt4: int = 0
+            VarInt5: int = 0
+            VarFloat: float = 1.23
+            list1: list[int] = [1, 2, 0, 4]
+            list2: Optional[list[int]] = None
+            list3: Optional[list[int]] = None
+            set1: set[float] = {1.43}
+            set2: set[float] = {5.43}
+
+            @classmethod
+            def __initializer(cls):
+                cls.VarInt2 = abs(cls.VarInt)
+                cls.VarFloat = round(cls.VarFloat)
+                cls.VarInt = min(cls.list1)
+                cls.VarInt3 = max(cls.list1)
+                cls.VarInt4 = sum(cls.list1)
+                cls.VarInt5 = len(cls.list1)
+                cls.list2 = sorted(cls.list1)
+                cls.list3 = []
+                for i in range(5):
+                    cls.list3.append(i)
+                cls.set2 = {math.ceil(list(cls.set1)[0])}
+
+        app2 = Appliance2()
+        self.assertEquals(app2.VarInt2, 56)
+        self.assertEquals(app2.VarFloat, 1)
+        self.assertEquals(app2.VarInt, 0)
+        self.assertEquals(app2.VarInt3, 4)
+        self.assertEquals(app2.VarInt4, 7)
+        self.assertEquals(app2.VarInt5, 4)
+        self.assertEquals(app2.list2, (0, 1, 2, 4))
+        self.assertEquals(app2.list3, (0, 1, 2, 3, 4))
+        self.assertEquals(app2.set2, {2})
+
+        class _(dm.BaseAppliance):
+            _: int = 0
+
+            @classmethod
+            def __initializer(cls):
+                test_initializer_safe_testfc()
+
 
 # ---------- main ----------