add repr info to ValkeyCache

Author: amirreza8002

aiocache/backends/valkey.py

@@ -101,7 +101,9 @@ async def _add(self, key, value, ttl=None, _conn=None):
             kwargs["expiry"] = ExpirySet(ExpiryType.SEC, ttl)
         was_set = await self.client.set(key, value, **kwargs)
         if was_set != "OK":
-            raise ValueError("Key {} already exists, use .set to update the value".format(key))
+            raise ValueError(
+                "Key {} already exists, use .set to update the value".format(key)
+            )
         return was_set
 
     async def _exists(self, key, _conn=None):
@@ -245,4 +247,4 @@ def parse_uri_path(cls, path):
         return options
 
     def __repr__(self):  # pragma: no cover
-        return "ValkeyCache"
+        return f"ValkeyCache ({self.client.config.addresses[0].host}:{self.client.config.addresses[0].port})"