Added delete option to database storage.

venv/Lib/site-packages/grpc/aio/_typing.py

@@ -0,0 +1,32 @@
+# Copyright 2019 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Common types for gRPC Async API"""
+
+from typing import (Any, AsyncIterable, Callable, Iterable, Sequence, Tuple,
+                    TypeVar, Union)
+
+from grpc._cython.cygrpc import EOF
+from ._metadata import Metadata, MetadataKey, MetadataValue
+
+RequestType = TypeVar('RequestType')
+ResponseType = TypeVar('ResponseType')
+SerializingFunction = Callable[[Any], bytes]
+DeserializingFunction = Callable[[bytes], Any]
+MetadatumType = Tuple[MetadataKey, MetadataValue]
+MetadataType = Metadata
+ChannelArgumentType = Sequence[Tuple[str, Any]]
+EOFType = type(EOF)
+DoneCallbackType = Callable[[Any], None]
+RequestIterableType = Union[Iterable[Any], AsyncIterable[Any]]
+ResponseIterableType = AsyncIterable[Any]