Improve a lot

none/session.py

@@ -0,0 +1,24 @@
+from typing import Union, Callable, Dict, Any, List, Sequence
+
+from aiocqhttp import CQHttp
+
+from .helpers import send, send_expr
+
+
+class BaseSession:
+    __slots__ = ('bot', 'ctx')
+
+    def __init__(self, bot: CQHttp, ctx: Dict[str, Any]):
+        self.bot = bot
+        self.ctx = ctx
+
+    async def send(self,
+                   message: Union[str, Dict[str, Any], List[Dict[str, Any]]],
+                   *, ignore_failure: bool = True) -> None:
+        return await send(self.bot, self.ctx, message,
+                          ignore_failure=ignore_failure)
+
+    async def send_expr(self,
+                        expr: Union[str, Sequence[str], Callable],
+                        **kwargs):
+        return await send_expr(self.bot, self.ctx, expr, **kwargs)