Code cleanup

Author: kristjanvalur

redis/asyncio/connection.py

@@ -2,7 +2,6 @@
 import copy
 import enum
 import inspect
-import io
 import os
 import socket
 import ssl
@@ -183,7 +182,7 @@ def parse_error(self, response: str) -> ResponseError:
         """Parse an error response"""
         error_code = response.split(" ")[0]
         if error_code in self.EXCEPTION_CLASSES:
-            response = response[len(error_code) + 1:]
+            response = response[len(error_code) + 1 :]
             exception_class = self.EXCEPTION_CLASSES[error_code]
             if isinstance(exception_class, dict):
                 exception_class = exception_class.get(response, ResponseError)