Change default target python version to 3.8 (#2061)

* Change default target python version to 3.8

* Fix format

datamodel_code_generator/__init__.py

@@ -236,7 +236,7 @@ def generate(
     input_file_type: InputFileType = InputFileType.Auto,
     output: Optional[Path] = None,
     output_model_type: DataModelType = DataModelType.PydanticBaseModel,
-    target_python_version: PythonVersion = PythonVersion.PY_37,
+    target_python_version: PythonVersion = PythonVersion.PY_38,
     base_class: str = '',
     additional_imports: Optional[List[str]] = None,
     custom_template_dir: Optional[Path] = None,

datamodel_code_generator/__main__.py

@@ -248,7 +248,7 @@ def validate_root(cls, values: Any) -> Any:
     output: Optional[Path] = None
     debug: bool = False
     disable_warnings: bool = False
-    target_python_version: PythonVersion = PythonVersion.PY_37
+    target_python_version: PythonVersion = PythonVersion.PY_38
     base_class: str = ''
     additional_imports: Optional[List[str]] = (None,)
     custom_template_dir: Optional[Path] = None

datamodel_code_generator/arguments.py

@@ -157,7 +157,7 @@ def start_section(self, heading: Optional[str]) -> None:
 )
 model_options.add_argument(
     '--target-python-version',
-    help='target python version (default: 3.7)',
+    help='target python version (default: 3.8)',
     choices=[v.value for v in PythonVersion],
 )
 model_options.add_argument(

datamodel_code_generator/model/pydantic/types.py

@@ -151,7 +151,7 @@ class DataTypeManager(_DataTypeManager):
 
     def __init__(
         self,
-        python_version: PythonVersion = PythonVersion.PY_37,
+        python_version: PythonVersion = PythonVersion.PY_38,
         use_standard_collections: bool = False,
         use_generic_container_types: bool = False,
         strict_types: Optional[Sequence[StrictTypes]] = None,

datamodel_code_generator/model/pydantic_v2/base_model.py

@@ -1,7 +1,6 @@
 import re
 from pathlib import Path
 from typing import (
-    TYPE_CHECKING,
     Any,
     ClassVar,
     DefaultDict,
@@ -13,6 +12,7 @@
 )
 
 from pydantic import Field
+from typing_extensions import Literal
 
 from datamodel_code_generator.model.base import UNDEFINED, DataModelFieldBase
 from datamodel_code_generator.model.pydantic.base_model import (
@@ -28,14 +28,6 @@
 from datamodel_code_generator.reference import Reference
 from datamodel_code_generator.util import field_validator, model_validator
 
-if TYPE_CHECKING:
-    from typing_extensions import Literal
-else:
-    try:
-        from typing import Literal
-    except ImportError:  # pragma: no cover
-        from typing_extensions import Literal
-
 
 class Constraints(_Constraints):
     # To override existing pattern alias

datamodel_code_generator/model/pydantic_v2/root_model.py

@@ -1,12 +1,9 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Any, ClassVar, Optional
+from typing import Any, ClassVar, Literal, Optional
 
 from datamodel_code_generator.model.pydantic_v2.base_model import BaseModel
 
-if TYPE_CHECKING:
-    from typing_extensions import Literal
-
 
 class RootModel(BaseModel):
     TEMPLATE_FILE_PATH: ClassVar[str] = 'pydantic_v2/RootModel.jinja2'

datamodel_code_generator/model/types.py

@@ -52,7 +52,7 @@ def type_map_factory(
 class DataTypeManager(_DataTypeManager):
     def __init__(
         self,
-        python_version: PythonVersion = PythonVersion.PY_37,
+        python_version: PythonVersion = PythonVersion.PY_38,
         use_standard_collections: bool = False,
         use_generic_container_types: bool = False,
         strict_types: Optional[Sequence[StrictTypes]] = None,

datamodel_code_generator/parser/base.py

@@ -342,7 +342,7 @@ def __init__(
         additional_imports: Optional[List[str]] = None,
         custom_template_dir: Optional[Path] = None,
         extra_template_data: Optional[DefaultDict[str, Dict[str, Any]]] = None,
-        target_python_version: PythonVersion = PythonVersion.PY_37,
+        target_python_version: PythonVersion = PythonVersion.PY_38,
         dump_resolve_reference_action: Optional[Callable[[Iterable[str]], str]] = None,
         validation: bool = False,
         field_constraints: bool = False,

datamodel_code_generator/parser/graphql.py

@@ -98,7 +98,7 @@ def __init__(
         additional_imports: Optional[List[str]] = None,
         custom_template_dir: Optional[Path] = None,
         extra_template_data: Optional[DefaultDict[str, Dict[str, Any]]] = None,
-        target_python_version: PythonVersion = PythonVersion.PY_37,
+        target_python_version: PythonVersion = PythonVersion.PY_38,
         dump_resolve_reference_action: Optional[Callable[[Iterable[str]], str]] = None,
         validation: bool = False,
         field_constraints: bool = False,

datamodel_code_generator/parser/jsonschema.py

@@ -384,7 +384,7 @@ def __init__(
         additional_imports: Optional[List[str]] = None,
         custom_template_dir: Optional[Path] = None,
         extra_template_data: Optional[DefaultDict[str, Dict[str, Any]]] = None,
-        target_python_version: PythonVersion = PythonVersion.PY_37,
+        target_python_version: PythonVersion = PythonVersion.PY_38,
         dump_resolve_reference_action: Optional[Callable[[Iterable[str]], str]] = None,
         validation: bool = False,
         field_constraints: bool = False,

datamodel_code_generator/parser/openapi.py

@@ -165,7 +165,7 @@ def __init__(
         additional_imports: Optional[List[str]] = None,
         custom_template_dir: Optional[Path] = None,
         extra_template_data: Optional[DefaultDict[str, Dict[str, Any]]] = None,
-        target_python_version: PythonVersion = PythonVersion.PY_37,
+        target_python_version: PythonVersion = PythonVersion.PY_38,
         dump_resolve_reference_action: Optional[Callable[[Iterable[str]], str]] = None,
         validation: bool = False,
         field_constraints: bool = False,

datamodel_code_generator/types.py

@@ -261,7 +261,7 @@ class Config:
     is_func: bool = False
     kwargs: Optional[Dict[str, Any]] = None
     import_: Optional[Import] = None
-    python_version: PythonVersion = PythonVersion.PY_37
+    python_version: PythonVersion = PythonVersion.PY_38
     is_optional: bool = False
     is_dict: bool = False
     is_list: bool = False
@@ -567,7 +567,7 @@ class Types(Enum):
 class DataTypeManager(ABC):
     def __init__(
         self,
-        python_version: PythonVersion = PythonVersion.PY_37,
+        python_version: PythonVersion = PythonVersion.PY_38,
         use_standard_collections: bool = False,
         use_generic_container_types: bool = False,
         strict_types: Optional[Sequence[StrictTypes]] = None,

datamodel_code_generator/util.py

@@ -24,7 +24,8 @@
 PYDANTIC_V2: bool = PYDANTIC_VERSION >= version.parse('2.0b3')
 
 if TYPE_CHECKING:
-    from typing_extensions import Literal
+    from typing import Literal
+
     from yaml import SafeLoader
 
     def load_toml(path: Path) -> Dict[str, Any]: ...

tests/data/expected/main/graphql/additional_imports_isort4.py

@@ -5,10 +5,9 @@
 from __future__ import annotations
 
 from datetime import date, datetime
-from typing import Optional, TypeAlias
+from typing import Literal, Optional, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 from mymodule.myclass import MyCustomPythonClass
 

tests/data/expected/main/graphql/additional_imports_isort5.py

@@ -5,11 +5,10 @@
 from __future__ import annotations
 
 from datetime import date, datetime
-from typing import Optional, TypeAlias
+from typing import Literal, Optional, TypeAlias
 
 from mymodule.myclass import MyCustomPythonClass
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/annotated.py

@@ -4,10 +4,10 @@
 
 from __future__ import annotations
 
-from typing import List, Optional, TypeAlias
+from typing import List, Literal, Optional, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Annotated, Literal
+from typing_extensions import Annotated
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/custom_formatters.py

@@ -5,10 +5,9 @@
 # a comment
 from __future__ import annotations
 
-from typing import Optional, TypeAlias
+from typing import Literal, Optional, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/custom_scalar_types.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import Optional, TypeAlias
+from typing import Literal, Optional, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/different_types_of_fields.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import List, Optional, TypeAlias
+from typing import List, Literal, Optional, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/field_aliases.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import Optional, TypeAlias
+from typing import Literal, Optional, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/github_api.py

@@ -6,10 +6,9 @@
 
 from datetime import date, datetime
 from enum import Enum
-from typing import List, Optional, TypeAlias, Union
+from typing import List, Literal, Optional, TypeAlias, Union
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Base64String: TypeAlias = str
 """

tests/data/expected/main/graphql/simple_star_wars.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import List, Optional, TypeAlias
+from typing import List, Literal, Optional, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/simple_star_wars_dataclass.py

@@ -5,9 +5,7 @@
 from __future__ import annotations
 
 from dataclasses import dataclass
-from typing import List, Optional, TypeAlias
-
-from typing_extensions import Literal
+from typing import List, Literal, Optional, TypeAlias
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/union.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import Optional, TypeAlias, Union
+from typing import Literal, Optional, TypeAlias, Union
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/use_standard_collections.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import Optional, TypeAlias
+from typing import Literal, Optional, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/graphql/use_union_operator.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import List, TypeAlias
+from typing import List, Literal, TypeAlias
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 Boolean: TypeAlias = bool
 """

tests/data/expected/main/jsonschema/discriminator_literals.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import Union
+from typing import Literal, Union
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 
 class Type1(BaseModel):

tests/data/expected/main/jsonschema/discriminator_with_external_reference.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import Optional, Union
+from typing import Literal, Optional, Union
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 
 class Type1(BaseModel):

tests/data/expected/main/jsonschema/discriminator_with_external_references_folder/inner_folder/artificial_folder/type_1.py

@@ -4,8 +4,9 @@
 
 from __future__ import annotations
 
+from typing import Literal
+
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 
 class Type1(BaseModel):

tests/data/expected/main/jsonschema/discriminator_with_external_references_folder/inner_folder/schema.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import Union
+from typing import Literal, Union
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 from .. import type_4
 from ..subfolder import type_5

tests/data/expected/main/jsonschema/discriminator_with_external_references_folder/inner_folder/type_2.py

@@ -4,10 +4,9 @@
 
 from __future__ import annotations
 
-from typing import Optional
+from typing import Literal, Optional
 
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 from .artificial_folder import type_1
 

tests/data/expected/main/jsonschema/discriminator_with_external_references_folder/subfolder/type_5.py

@@ -4,8 +4,9 @@
 
 from __future__ import annotations
 
+from typing import Literal
+
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 
 class Type5(BaseModel):

tests/data/expected/main/jsonschema/discriminator_with_external_references_folder/type_4.py

@@ -4,8 +4,9 @@
 
 from __future__ import annotations
 
+from typing import Literal
+
 from pydantic import BaseModel, Field
-from typing_extensions import Literal
 
 
 class Type4(BaseModel):