[pre-commit.ci] auto fixes from pre-commit.com hooks

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src/aiida/engine/transports.py

@@ -13,7 +13,6 @@
 import contextvars
 import logging
 import traceback
-from datetime import datetime
 from typing import TYPE_CHECKING, Awaitable, Dict, Hashable, Iterator, Optional
 
 from aiida.common import timezone
@@ -32,13 +31,15 @@ def __init__(self):
         self.future: asyncio.Future = asyncio.Future()
         self.count = 0
 
+
 class TransportCloseRequest:
     """Information kept about close request for a transport object"""
 
     def __init__(self):
         self.future: asyncio.Future = asyncio.Future()
         self.count = 0
 
+
 class TransportQueue:
     """A queue to get transport objects from authinfo.  This class allows clients
     to register their interest in a transport object which will be provided at
@@ -121,7 +122,9 @@ def do_open():
 
                 else:
                     # Otherwise, wait only the difference required until the `safe_open_interval` is reached
-                    open_callback_handle = self._loop.call_later(safe_open_interval-close_timedelta, do_open, context=contextvars.Context())
+                    open_callback_handle = self._loop.call_later(
+                        safe_open_interval - close_timedelta, do_open, context=contextvars.Context()
+                    )
 
         try:
             transport_request.count += 1
@@ -140,7 +143,6 @@ def do_open():
             # Check if there are no longer any users that want the transport
             if transport_request.count == 0:
                 if transport_request.future.done():
-
                     _LOGGER.debug('Transport request closing transport for %s', authinfo)
                     transport_request.future.result().close()