Fix compatibility issue with python <3.11 (#45)

python/demo/forms.py

@@ -1,8 +1,8 @@
 from __future__ import annotations as _annotations
 
+import enum
 from collections import defaultdict
 from datetime import date
-from enum import StrEnum
 from typing import Annotated, Literal, TypeAlias
 
 from fastapi import APIRouter, Request, UploadFile
@@ -123,7 +123,7 @@ async def login_form_post(form: Annotated[LoginForm, fastui_form(LoginForm)]) ->
     return FormResponse(event=GoToEvent(url='/'))
 
 
-class ToolEnum(StrEnum):
+class ToolEnum(str, enum.Enum):
     hammer = 'hammer'
     screwdriver = 'screwdriver'
     saw = 'saw'

python/fastui/components/display.py

@@ -4,14 +4,15 @@
 
 import annotated_types
 import pydantic
+import typing_extensions
 
 from .. import class_name as _class_name
 from .. import events
 
 __all__ = 'DisplayMode', 'DisplayLookup', 'Display', 'Details'
 
 
-class DisplayMode(enum.StrEnum):
+class DisplayMode(str, enum.Enum):
     """
     How to a value.
     """
@@ -64,7 +65,7 @@ class Details(pydantic.BaseModel, typing.Generic[DataModel], extra='forbid'):
     type: typing.Literal['Details'] = 'Details'
 
     @pydantic.model_validator(mode='after')
-    def fill_fields(self) -> typing.Self:
+    def fill_fields(self) -> typing_extensions.Self:
         if self.fields is None:
             self.fields = [
                 DisplayLookup(field=name, title=field.title) for name, field in self.data.model_fields.items()

python/fastui/json_schema.py

@@ -3,9 +3,10 @@
 import json
 import re
 import typing
-from typing import Iterable, Literal, Required, TypeAlias, TypedDict, TypeGuard, cast
+from typing import Iterable, Literal, TypeAlias, TypedDict, TypeGuard, cast
 
 from pydantic import BaseModel
+from typing_extensions import Required
 
 from .components.forms import (
     FormField,
@@ -31,9 +32,9 @@ def model_json_schema_to_fields(model: type[BaseModel]) -> list[FormField]:
     return list(json_schema_obj_to_fields(schema, [], [], defs))
 
 
-JsonSchemaInput: TypeAlias = (
-    'JsonSchemaString | JsonSchemaStringEnum | JsonSchemaFile | JsonSchemaInt | JsonSchemaNumber'
-)
+JsonSchemaInput: (
+    TypeAlias
+) = 'JsonSchemaString | JsonSchemaStringEnum | JsonSchemaFile | JsonSchemaInt | JsonSchemaNumber'
 JsonSchemaField: TypeAlias = 'JsonSchemaInput | JsonSchemaBool'
 JsonSchemaConcrete: TypeAlias = 'JsonSchemaField | JsonSchemaArray | JsonSchemaObject'
 JsonSchemaAny: TypeAlias = 'JsonSchemaConcrete | JsonSchemaAnyOf | JsonSchemaAllOf | JsonSchemaRef'