Fix compatibility issue with python <3.11

python/demo/forms.py

@@ -2,12 +2,12 @@
 
 from collections import defaultdict
 from datetime import date
-from enum import StrEnum
 from typing import Annotated, Literal, TypeAlias
 
 from fastapi import APIRouter, Request, UploadFile
 from fastui import AnyComponent, FastUI
 from fastui import components as c
+from fastui.enums import StrEnum
 from fastui.events import GoToEvent, PageEvent
 from fastui.forms import FormFile, FormResponse, SelectSearchResponse, fastui_form
 from httpx import AsyncClient

python/fastui/components/display.py

@@ -1,4 +1,3 @@
-import enum
 import typing
 from abc import ABC
 
@@ -7,11 +6,12 @@
 
 from .. import class_name as _class_name
 from .. import events
+from ..enums import StrEnum
 
 __all__ = 'DisplayMode', 'DisplayLookup', 'Display', 'Details'
 
 
-class DisplayMode(enum.StrEnum):
+class DisplayMode(StrEnum):
     """
     How to a value.
     """

python/fastui/enums.py

@@ -0,0 +1,34 @@
+from enum import Enum
+
+
+class StrEnum(str, Enum):
+    """
+    Enum where members are also (and must be) strings
+    """
+
+    def __new__(cls, *values):
+        if len(values) > 3:
+            raise TypeError(f'too many arguments for str(): {values!r}')
+
+        if len(values) == 1:
+            # it must be a string
+            if not isinstance(values[0], str):
+                raise TypeError(f'{values[0]!r} is not a string')
+        if len(values) >= 2:
+            # check that encoding argument is a string
+            if not isinstance(values[1], str):
+                raise TypeError(f'encoding must be a string, not {values[1]!r}')
+        if len(values) == 3:
+            # check that errors argument is a string
+            if not isinstance(values[2], str):
+                raise TypeError(f'errors must be a string, not {values[2]!r}')
+        value = str(*values)
+        member = str.__new__(cls, value)
+        member._value_ = value
+        return member
+
+    def _generate_next_value_(name, start, count, last_values):
+        """
+        Return the lower-cased version of the member name.
+        """
+        return name.lower()