Feature: 在加载 driver 引发 ImportError 时，使用 raise from e

nonebot/drivers/aiohttp.py

@@ -27,10 +27,10 @@
 
 try:
     import aiohttp
-except ImportError:  # pragma: no cover
+except ImportError as e:  # pragma: no cover
     raise ImportError(
         "Please install aiohttp first to use this driver. `pip install nonebot2[aiohttp]`"
-    ) from None
+    ) from e
 
 
 class Mixin(ForwardMixin):

nonebot/drivers/fastapi.py

@@ -37,10 +37,10 @@
     from fastapi.responses import Response
     from fastapi import FastAPI, Request, UploadFile, status
     from starlette.websockets import WebSocket, WebSocketState, WebSocketDisconnect
-except ImportError:  # pragma: no cover
+except ImportError as e:  # pragma: no cover
     raise ImportError(
         "Please install FastAPI by using `pip install nonebot2[fastapi]`"
-    ) from None
+    ) from e
 
 
 def catch_closed(func):

nonebot/drivers/httpx.py

@@ -31,10 +31,10 @@
 
 try:
     import httpx
-except ImportError:  # pragma: no cover
+except ImportError as e:  # pragma: no cover
     raise ImportError(
         "Please install httpx by using `pip install nonebot2[httpx]`"
-    ) from None
+    ) from e
 
 
 class Mixin(ForwardMixin):

nonebot/drivers/quart.py

@@ -37,10 +37,10 @@
     from quart import Quart, Request, Response
     from quart.datastructures import FileStorage
     from quart import Websocket as QuartWebSocket
-except ImportError:  # pragma: no cover
+except ImportError as e:  # pragma: no cover
     raise ImportError(
         "Please install Quart by using `pip install nonebot2[quart]`"
-    ) from None
+    ) from e
 
 _AsyncCallable = TypeVar("_AsyncCallable", bound=Callable[..., Coroutine])
 

nonebot/drivers/websockets.py

@@ -30,10 +30,10 @@
 try:
     from websockets.exceptions import ConnectionClosed
     from websockets.legacy.client import Connect, WebSocketClientProtocol
-except ImportError:  # pragma: no cover
+except ImportError as e:  # pragma: no cover
     raise ImportError(
         "Please install websockets by using `pip install nonebot2[websockets]`"
-    ) from None
+    ) from e
 
 logger = logging.Logger("websockets.client", "INFO")
 logger.addHandler(LoguruHandler())