Changed code to support older Python versions

venv/lib/python3.11/site-packages/fastapi/_compat/model_field.py

@@ -0,0 +1,53 @@
+from typing import (
+    Any,
+    Dict,
+    List,
+    Tuple,
+    Union,
+)
+
+from fastapi.types import IncEx
+from pydantic.fields import FieldInfo
+from typing_extensions import Literal, Protocol
+
+
+class ModelField(Protocol):
+    field_info: "FieldInfo"
+    name: str
+    mode: Literal["validation", "serialization"] = "validation"
+    _version: Literal["v1", "v2"] = "v1"
+
+    @property
+    def alias(self) -> str: ...
+
+    @property
+    def required(self) -> bool: ...
+
+    @property
+    def default(self) -> Any: ...
+
+    @property
+    def type_(self) -> Any: ...
+
+    def get_default(self) -> Any: ...
+
+    def validate(
+        self,
+        value: Any,
+        values: Dict[str, Any] = {},  # noqa: B006
+        *,
+        loc: Tuple[Union[int, str], ...] = (),
+    ) -> Tuple[Any, Union[List[Dict[str, Any]], None]]: ...
+
+    def serialize(
+        self,
+        value: Any,
+        *,
+        mode: Literal["json", "python"] = "json",
+        include: Union[IncEx, None] = None,
+        exclude: Union[IncEx, None] = None,
+        by_alias: bool = True,
+        exclude_unset: bool = False,
+        exclude_defaults: bool = False,
+        exclude_none: bool = False,
+    ) -> Any: ...