Use --no-implicit-optional for type checking

This makes type checking PEP 484 compliant (as of 2018).
mypy will change its defaults soon.

See:
python/mypy#9091
python/mypy#13401

pydantic/class_validators.py

@@ -55,7 +55,7 @@ def validator(
     each_item: bool = False,
     always: bool = False,
     check_fields: bool = True,
-    whole: bool = None,
+    whole: Optional[bool] = None,
     allow_reuse: bool = False,
 ) -> Callable[[AnyCallable], 'AnyClassMethod']:
     """

pydantic/env_settings.py

@@ -316,7 +316,7 @@ def __repr__(self) -> str:
 
 
 def read_env_file(
-    file_path: StrPath, *, encoding: str = None, case_sensitive: bool = False
+    file_path: StrPath, *, encoding: Optional[str] = None, case_sensitive: bool = False
 ) -> Dict[str, Optional[str]]:
     try:
         from dotenv import dotenv_values

pydantic/fields.py

@@ -220,27 +220,27 @@ def Field(
     default: Any = Undefined,
     *,
     default_factory: Optional[NoArgAnyCallable] = None,
-    alias: str = None,
-    title: str = None,
-    description: str = None,
+    alias: Optional[str] = None,
+    title: Optional[str] = None,
+    description: Optional[str] = None,
     exclude: Union['AbstractSetIntStr', 'MappingIntStrAny', Any] = None,
     include: Union['AbstractSetIntStr', 'MappingIntStrAny', Any] = None,
-    const: bool = None,
-    gt: float = None,
-    ge: float = None,
-    lt: float = None,
-    le: float = None,
-    multiple_of: float = None,
-    max_digits: int = None,
-    decimal_places: int = None,
-    min_items: int = None,
-    max_items: int = None,
-    unique_items: bool = None,
-    min_length: int = None,
-    max_length: int = None,
+    const: Optional[bool] = None,
+    gt: Optional[float] = None,
+    ge: Optional[float] = None,
+    lt: Optional[float] = None,
+    le: Optional[float] = None,
+    multiple_of: Optional[float] = None,
+    max_digits: Optional[int] = None,
+    decimal_places: Optional[int] = None,
+    min_items: Optional[int] = None,
+    max_items: Optional[int] = None,
+    unique_items: Optional[bool] = None,
+    min_length: Optional[int] = None,
+    max_length: Optional[int] = None,
     allow_mutation: bool = True,
-    regex: str = None,
-    discriminator: str = None,
+    regex: Optional[str] = None,
+    discriminator: Optional[str] = None,
     repr: bool = True,
     **extra: Any,
 ) -> Any:
@@ -395,7 +395,7 @@ def __init__(
         default_factory: Optional[NoArgAnyCallable] = None,
         required: 'BoolUndefined' = Undefined,
         final: bool = False,
-        alias: str = None,
+        alias: Optional[str] = None,
         field_info: Optional[FieldInfo] = None,
     ) -> None:
 

pydantic/main.py

@@ -522,9 +522,9 @@ def parse_raw(
         cls: Type['Model'],
         b: StrBytes,
         *,
-        content_type: str = None,
+        content_type: Optional[str] = None,
         encoding: str = 'utf8',
-        proto: Protocol = None,
+        proto: Optional[Protocol] = None,
         allow_pickle: bool = False,
     ) -> 'Model':
         try:
@@ -545,9 +545,9 @@ def parse_file(
         cls: Type['Model'],
         path: Union[str, Path],
         *,
-        content_type: str = None,
+        content_type: Optional[str] = None,
         encoding: str = 'utf8',
-        proto: Protocol = None,
+        proto: Optional[Protocol] = None,
         allow_pickle: bool = False,
     ) -> 'Model':
         obj = load_file(
@@ -920,8 +920,8 @@ def create_model(
     __config__: Optional[Type[BaseConfig]] = None,
     __base__: None = None,
     __module__: str = __name__,
-    __validators__: Dict[str, 'AnyClassMethod'] = None,
-    __cls_kwargs__: Dict[str, Any] = None,
+    __validators__: Optional[Dict[str, 'AnyClassMethod']] = None,
+    __cls_kwargs__: Optional[Dict[str, Any]] = None,
     **field_definitions: Any,
 ) -> Type['BaseModel']:
     ...
@@ -934,8 +934,8 @@ def create_model(
     __config__: Optional[Type[BaseConfig]] = None,
     __base__: Union[Type['Model'], Tuple[Type['Model'], ...]],
     __module__: str = __name__,
-    __validators__: Dict[str, 'AnyClassMethod'] = None,
-    __cls_kwargs__: Dict[str, Any] = None,
+    __validators__: Optional[Dict[str, 'AnyClassMethod']] = None,
+    __cls_kwargs__: Optional[Dict[str, Any]] = None,
     **field_definitions: Any,
 ) -> Type['Model']:
     ...
@@ -947,8 +947,8 @@ def create_model(
     __config__: Optional[Type[BaseConfig]] = None,
     __base__: Union[None, Type['Model'], Tuple[Type['Model'], ...]] = None,
     __module__: str = __name__,
-    __validators__: Dict[str, 'AnyClassMethod'] = None,
-    __cls_kwargs__: Dict[str, Any] = None,
+    __validators__: Optional[Dict[str, 'AnyClassMethod']] = None,
+    __cls_kwargs__: Optional[Dict[str, Any]] = None,
     **field_definitions: Any,
 ) -> Type['Model']:
     """
@@ -1017,7 +1017,7 @@ def create_model(
 
 
 def validate_model(  # noqa: C901 (ignore complexity)
-    model: Type[BaseModel], input_data: 'DictStrAny', cls: 'ModelOrDc' = None
+    model: Type[BaseModel], input_data: 'DictStrAny', cls: Optional['ModelOrDc'] = None
 ) -> Tuple['DictStrAny', 'SetStr', Optional[ValidationError]]:
     """
     validate data against a model.

pydantic/parse.py

@@ -2,7 +2,7 @@
 import pickle
 from enum import Enum
 from pathlib import Path
-from typing import Any, Callable, Union
+from typing import Any, Callable, Optional, Union
 
 from .types import StrBytes
 
@@ -15,9 +15,9 @@ class Protocol(str, Enum):
 def load_str_bytes(
     b: StrBytes,
     *,
-    content_type: str = None,
+    content_type: Optional[str] = None,
     encoding: str = 'utf8',
-    proto: Protocol = None,
+    proto: Optional[Protocol] = None,
     allow_pickle: bool = False,
     json_loads: Callable[[str], Any] = json.loads,
 ) -> Any:
@@ -47,9 +47,9 @@ def load_str_bytes(
 def load_file(
     path: Union[str, Path],
     *,
-    content_type: str = None,
+    content_type: Optional[str] = None,
     encoding: str = 'utf8',
-    proto: Protocol = None,
+    proto: Optional[Protocol] = None,
     allow_pickle: bool = False,
     json_loads: Callable[[str], Any] = json.loads,
 ) -> Any:

pydantic/schema.py

@@ -224,7 +224,7 @@ def field_schema(
     model_name_map: Dict[TypeModelOrEnum, str],
     ref_prefix: Optional[str] = None,
     ref_template: str = default_ref_template,
-    known_models: TypeModelSet = None,
+    known_models: Optional[TypeModelSet] = None,
 ) -> Tuple[Dict[str, Any], Dict[str, Any], Set[str]]:
     """
     Process a Pydantic field and return a tuple with a JSON Schema for it as the first item.
@@ -344,7 +344,7 @@ def get_model_name_map(unique_models: TypeModelSet) -> Dict[TypeModelOrEnum, str
     return {v: k for k, v in name_model_map.items()}
 
 
-def get_flat_models_from_model(model: Type['BaseModel'], known_models: TypeModelSet = None) -> TypeModelSet:
+def get_flat_models_from_model(model: Type['BaseModel'], known_models: Optional[TypeModelSet] = None) -> TypeModelSet:
     """
     Take a single ``model`` and generate a set with itself and all the sub-models in the tree. I.e. if you pass
     model ``Foo`` (subclass of Pydantic ``BaseModel``) as ``model``, and it has a field of type ``Bar`` (also
@@ -553,7 +553,7 @@ def model_process_schema(
     model_name_map: Dict[TypeModelOrEnum, str],
     ref_prefix: Optional[str] = None,
     ref_template: str = default_ref_template,
-    known_models: TypeModelSet = None,
+    known_models: Optional[TypeModelSet] = None,
     field: Optional[ModelField] = None,
 ) -> Tuple[Dict[str, Any], Dict[str, Any], Set[str]]:
     """

pydantic/tools.py

@@ -42,9 +42,9 @@ def parse_file_as(
     type_: Type[T],
     path: Union[str, Path],
     *,
-    content_type: str = None,
+    content_type: Optional[str] = None,
     encoding: str = 'utf8',
-    proto: Protocol = None,
+    proto: Optional[Protocol] = None,
     allow_pickle: bool = False,
     json_loads: Callable[[str], Any] = json.loads,
     type_name: Optional[NameFactory] = None,
@@ -64,9 +64,9 @@ def parse_raw_as(
     type_: Type[T],
     b: StrBytes,
     *,
-    content_type: str = None,
+    content_type: Optional[str] = None,
     encoding: str = 'utf8',
-    proto: Protocol = None,
+    proto: Optional[Protocol] = None,
     allow_pickle: bool = False,
     json_loads: Callable[[str], Any] = json.loads,
     type_name: Optional[NameFactory] = None,

pydantic/types.py

@@ -224,7 +224,13 @@ def __get_validators__(cls) -> 'CallableGenerator':
 
 
 def conint(
-    *, strict: bool = False, gt: int = None, ge: int = None, lt: int = None, le: int = None, multiple_of: int = None
+    *,
+    strict: bool = False,
+    gt: Optional[int] = None,
+    ge: Optional[int] = None,
+    lt: Optional[int] = None,
+    le: Optional[int] = None,
+    multiple_of: Optional[int] = None,
 ) -> Type[int]:
     # use kwargs then define conf in a dict to aid with IDE type hinting
     namespace = dict(strict=strict, gt=gt, ge=ge, lt=lt, le=le, multiple_of=multiple_of)
@@ -296,11 +302,11 @@ def __get_validators__(cls) -> 'CallableGenerator':
 def confloat(
     *,
     strict: bool = False,
-    gt: float = None,
-    ge: float = None,
-    lt: float = None,
-    le: float = None,
-    multiple_of: float = None,
+    gt: Optional[float] = None,
+    ge: Optional[float] = None,
+    lt: Optional[float] = None,
+    le: Optional[float] = None,
+    multiple_of: Optional[float] = None,
 ) -> Type[float]:
     # use kwargs then define conf in a dict to aid with IDE type hinting
     namespace = dict(strict=strict, gt=gt, ge=ge, lt=lt, le=le, multiple_of=multiple_of)
@@ -360,8 +366,8 @@ def conbytes(
     strip_whitespace: bool = False,
     to_upper: bool = False,
     to_lower: bool = False,
-    min_length: int = None,
-    max_length: int = None,
+    min_length: Optional[int] = None,
+    max_length: Optional[int] = None,
     strict: bool = False,
 ) -> Type[bytes]:
     # use kwargs then define conf in a dict to aid with IDE type hinting
@@ -433,10 +439,10 @@ def constr(
     to_upper: bool = False,
     to_lower: bool = False,
     strict: bool = False,
-    min_length: int = None,
-    max_length: int = None,
-    curtail_length: int = None,
-    regex: str = None,
+    min_length: Optional[int] = None,
+    max_length: Optional[int] = None,
+    curtail_length: Optional[int] = None,
+    regex: Optional[str] = None,
 ) -> Type[str]:
     # use kwargs then define conf in a dict to aid with IDE type hinting
     namespace = dict(
@@ -497,7 +503,7 @@ def set_length_validator(cls, v: 'Optional[Set[T]]') -> 'Optional[Set[T]]':
         return v
 
 
-def conset(item_type: Type[T], *, min_items: int = None, max_items: int = None) -> Type[Set[T]]:
+def conset(item_type: Type[T], *, min_items: Optional[int] = None, max_items: Optional[int] = None) -> Type[Set[T]]:
     # __args__ is needed to conform to typing generics api
     namespace = {'min_items': min_items, 'max_items': max_items, 'item_type': item_type, '__args__': [item_type]}
     # We use new_class to be able to deal with Generic types
@@ -539,7 +545,9 @@ def frozenset_length_validator(cls, v: 'Optional[FrozenSet[T]]') -> 'Optional[Fr
         return v
 
 
-def confrozenset(item_type: Type[T], *, min_items: int = None, max_items: int = None) -> Type[FrozenSet[T]]:
+def confrozenset(
+    item_type: Type[T], *, min_items: Optional[int] = None, max_items: Optional[int] = None
+) -> Type[FrozenSet[T]]:
     # __args__ is needed to conform to typing generics api
     namespace = {'min_items': min_items, 'max_items': max_items, 'item_type': item_type, '__args__': [item_type]}
     # We use new_class to be able to deal with Generic types
@@ -595,7 +603,11 @@ def unique_items_validator(cls, v: 'List[T]') -> 'List[T]':
 
 
 def conlist(
-    item_type: Type[T], *, min_items: int = None, max_items: int = None, unique_items: bool = None
+    item_type: Type[T],
+    *,
+    min_items: Optional[int] = None,
+    max_items: Optional[int] = None,
+    unique_items: Optional[bool] = None,
 ) -> Type[List[T]]:
     # __args__ is needed to conform to typing generics api
     namespace = dict(
@@ -704,13 +716,13 @@ def validate(cls, value: Decimal) -> Decimal:
 
 def condecimal(
     *,
-    gt: Decimal = None,
-    ge: Decimal = None,
-    lt: Decimal = None,
-    le: Decimal = None,
-    max_digits: int = None,
-    decimal_places: int = None,
-    multiple_of: Decimal = None,
+    gt: Optional[Decimal] = None,
+    ge: Optional[Decimal] = None,
+    lt: Optional[Decimal] = None,
+    le: Optional[Decimal] = None,
+    max_digits: Optional[int] = None,
+    decimal_places: Optional[int] = None,
+    multiple_of: Optional[Decimal] = None,
 ) -> Type[Decimal]:
     # use kwargs then define conf in a dict to aid with IDE type hinting
     namespace = dict(
@@ -1165,10 +1177,10 @@ def __get_validators__(cls) -> 'CallableGenerator':
 
 def condate(
     *,
-    gt: date = None,
-    ge: date = None,
-    lt: date = None,
-    le: date = None,
+    gt: Optional[date] = None,
+    ge: Optional[date] = None,
+    lt: Optional[date] = None,
+    le: Optional[date] = None,
 ) -> Type[date]:
     # use kwargs then define conf in a dict to aid with IDE type hinting
     namespace = dict(gt=gt, ge=ge, lt=lt, le=le)

setup.cfg

@@ -66,12 +66,12 @@ disallow_subclassing_any = True
 disallow_incomplete_defs = True
 disallow_untyped_decorators = True
 disallow_untyped_calls = True
+no_implicit_optional = True
 
 # for strict mypy: (this is the tricky one :-))
 disallow_untyped_defs = True
 
 # remaining arguments from `mypy --strict` which cause errors
-;no_implicit_optional = True
 ;warn_return_any = True
 
 [mypy-email_validator]