chore: fix mypy errors from stricter type checking in new version

Update RedisClientProtocol.delete to use variadic *names parameter
matching the actual redis-py signature. Add casts for _init_client
returns and type annotation for _regex_cache.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: leandrodamascena

aws_lambda_powertools/utilities/data_masking/provider/base.py

@@ -11,7 +11,7 @@
     from collections.abc import Callable
 
 PRESERVE_CHARS = set("-_. ")
-_regex_cache = {}
+_regex_cache: dict[str, re.Pattern[str]] = {}
 
 JSON_DUMPS_CALL = functools.partial(json.dumps, ensure_ascii=False)
 

aws_lambda_powertools/utilities/idempotency/persistence/redis.py

@@ -5,7 +5,7 @@
 import logging
 from contextlib import contextmanager
 from datetime import timedelta
-from typing import Any, Literal, Protocol
+from typing import Any, Literal, Protocol, cast
 
 import redis
 from typing_extensions import TypeAlias, deprecated
@@ -76,7 +76,7 @@ def set(  # noqa
     ) -> bool | None:
         raise NotImplementedError
 
-    def delete(self, keys: bytes | str | memoryview) -> Any:
+    def delete(self, *names: bytes | str | memoryview) -> Any:
         raise NotImplementedError
 
 
@@ -185,22 +185,25 @@ def _init_client(self) -> RedisClientProtocol:
         try:
             if self.url:
                 logger.debug(f"Using URL format to connect to Cache: {self.host}")
-                return client.from_url(url=self.url)
+                return cast(RedisClientProtocol, client.from_url(url=self.url))
             else:
                 # Cache in cluster mode doesn't support db parameter
                 extra_param_connection: dict[str, Any] = {}
                 if self.mode != "cluster":
                     extra_param_connection = {"db": self.db_index}
 
                 logger.debug(f"Using arguments to connect to Cache: {self.host}")
-                return client(
-                    host=self.host,
-                    port=self.port,
-                    username=self.username,
-                    password=self.password,
-                    decode_responses=True,
-                    ssl=self.ssl,
-                    **extra_param_connection,
+                return cast(
+                    RedisClientProtocol,
+                    client(
+                        host=self.host,
+                        port=self.port,
+                        username=self.username,
+                        password=self.password,
+                        decode_responses=True,
+                        ssl=self.ssl,
+                        **extra_param_connection,
+                    ),
                 )
         except redis.exceptions.ConnectionError as exc:
             logger.debug(f"Cannot connect to Cache endpoint: {self.host}")

examples/idempotency/src/getting_started_with_idempotency_redis_client.py

@@ -21,7 +21,7 @@
     max_connections=1000,
 )
 
-persistence_layer = CachePersistenceLayer(client=client)
+persistence_layer = CachePersistenceLayer(client=client)  # type: ignore[arg-type]
 
 
 @dataclass

examples/idempotency/src/using_redis_client_with_local_certs.py

@@ -27,7 +27,7 @@
     ssl_ca_certs=f"{abs_lambda_path()}/certs/cache_ca.pem",  # (4)!
 )
 
-persistence_layer = CachePersistenceLayer(client=redis_client)
+persistence_layer = CachePersistenceLayer(client=redis_client)  # type: ignore[arg-type]
 config = IdempotencyConfig(
     expires_after_seconds=2 * 60,  # 2 minutes
 )