Improve structure

none_demo/plugins/weather/__init__.py

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+from none.command import Session, CommandGroup
+
+from . import expressions as expr
+
+w = CommandGroup('weather')
+
+
+@w.command('weather', aliases=('天气', '天气预报'))
+async def weather(session: Session):
+    city = session.require_arg('city', prompt_expr=expr.WHICH_CITY)
+    await session.send_expr(expr.REPORT, city=city)
+
+
+@weather.args_parser
+async def _(session: Session):
+    if session.current_key:
+        session.args[session.current_key] = session.current_arg_text.strip()
+
+
+@w.command('suggestion', aliases=('生活指数', '生活建议', '生活提示'))
+async def suggestion(session: Session):
+    await session.send('suggestion')

none_demo/plugins/weather/expressions.py

@@ -0,0 +1,12 @@
+WHICH_CITY = (
+    '你想知道哪个城市的天气呢？',
+    '你要查询的城市是哪个呢？',
+    '你要查询哪个城市呢？',
+    '哪个城市呢？',
+    '请告诉我你要查询的城市～',
+)
+
+REPORT = (
+    '你查询了{city}的天气',
+    '{city}的天气是……',
+)