Add support for Python 3.9

Author: NMertsch

pyproject.toml

@@ -9,13 +9,16 @@ description = "All Discord-related things for the EuroPython conference"
 license = "MIT"
 license-files = ["LICENSE"]
 readme = "README.md"
-requires-python = ">=3.11"
+requires-python = ">=3.9"
 dependencies = [
     "discord-py>=2.3.1",
     "aiofiles>=24.1.0",
     "aiohttp>=3.11.16",
     "pydantic>=2.8.2",
     "unidecode>=1.3.8",
+    "tomli>=2.2.1; python_version < '3.11'",
+    "typing_extensions>=4.13.2; python_version < '3.11'",
+    "eval-type-backport>=0.2.2; python_version < '3.10'",
 ]
 
 [dependency-groups]

scripts/configure-guild.py

@@ -10,14 +10,19 @@
 import sys
 import textwrap
 from collections import defaultdict
-from typing import Annotated, Literal, Self, assert_never
+from typing import Annotated, Literal
 
 import discord
 from discord import VerificationLevel
 from discord.ext.commands import Bot
 from discord.utils import get as discord_get
 from pydantic import AfterValidator, BaseModel, Field, model_validator
 
+if sys.version_info >= (3, 11):
+    from typing import Self, assert_never
+else:
+    from typing_extensions import Self, assert_never
+
 logger = logging.getLogger(__name__)
 
 DESCRIPTION = """\

scripts/pretix-mock.py

@@ -1,5 +1,7 @@
 """Mock Pretix HTTP Server."""
 
+from __future__ import annotations
+
 import argparse
 import http.server
 import json

src/europython_discord/bot.py

@@ -5,7 +5,6 @@
 import logging
 import os
 import sys
-import tomllib
 from pathlib import Path
 from typing import Literal
 
@@ -20,6 +19,11 @@
 from europython_discord.registration.cog import RegistrationCog
 from europython_discord.registration.config import RegistrationConfig
 
+if sys.version_info >= (3, 11):
+    import tomllib
+else:
+    import tomli as tomllib
+
 # silence warning about missing discord voice support
 # https://github.com/Rapptz/discord.py/issues/1719#issuecomment-437703581
 discord.VoiceClient.warn_nacl = False

src/europython_discord/program_notifications/cog.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import logging
 
 from discord import Client, TextChannel

src/europython_discord/program_notifications/livestream_connector.py

@@ -1,9 +1,16 @@
+from __future__ import annotations
+
 import asyncio
 import logging
-import tomllib
+import sys
 from datetime import date
 from pathlib import Path
 
+if sys.version_info >= (3, 11):
+    import tomllib
+else:
+    import tomli as tomllib
+
 import aiofiles
 
 logger = logging.getLogger(__name__)

src/europython_discord/program_notifications/program_connector.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import asyncio
 import json
 import logging

src/europython_discord/program_notifications/session_to_embed.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import textwrap
 from datetime import datetime
 from enum import Enum

src/europython_discord/registration/pretix_connector.py

@@ -5,7 +5,7 @@
 import logging
 import time
 from collections import defaultdict
-from datetime import UTC, datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from pathlib import Path
 
 import aiofiles
@@ -57,7 +57,7 @@ async def fetch_pretix_data(self) -> None:
         # if called during an ongoing fetch, the caller waits until the fetch is done...
         async with self._fetch_lock:
             # ... but does not trigger a second fetch
-            now = datetime.now(tz=UTC)
+            now = datetime.now(tz=timezone.utc)
             if self._last_fetch and now - self._last_fetch < timedelta(minutes=2):
                 _logger.info(f"Skipping pretix fetch (last fetch was at {self._last_fetch})")
                 return

src/europython_discord/registration/ticket.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import string
 
 from pydantic import BaseModel, ConfigDict, computed_field