PIP-2428: Update for Python 3.

.gitignore

@@ -105,3 +105,4 @@ venv.bak/
 
 .idea
 tests/.workspace/
+/proto_vendor/

etcd3/_grpc_stubs/auth_pb2.pyi

@@ -0,0 +1,52 @@
+from gogoproto import gogo_pb2 as _gogo_pb2
+from google.protobuf.internal import containers as _containers
+from google.protobuf.internal import enum_type_wrapper as _enum_type_wrapper
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from typing import ClassVar as _ClassVar, Iterable as _Iterable, Mapping as _Mapping, Optional as _Optional, Union as _Union
+
+DESCRIPTOR: _descriptor.FileDescriptor
+
+class UserAddOptions(_message.Message):
+    __slots__ = ["no_password"]
+    NO_PASSWORD_FIELD_NUMBER: _ClassVar[int]
+    no_password: bool
+    def __init__(self, no_password: bool = ...) -> None: ...
+
+class User(_message.Message):
+    __slots__ = ["name", "password", "roles", "options"]
+    NAME_FIELD_NUMBER: _ClassVar[int]
+    PASSWORD_FIELD_NUMBER: _ClassVar[int]
+    ROLES_FIELD_NUMBER: _ClassVar[int]
+    OPTIONS_FIELD_NUMBER: _ClassVar[int]
+    name: bytes
+    password: bytes
+    roles: _containers.RepeatedScalarFieldContainer[str]
+    options: UserAddOptions
+    def __init__(self, name: _Optional[bytes] = ..., password: _Optional[bytes] = ..., roles: _Optional[_Iterable[str]] = ..., options: _Optional[_Union[UserAddOptions, _Mapping]] = ...) -> None: ...
+
+class Permission(_message.Message):
+    __slots__ = ["permType", "key", "range_end"]
+    class Type(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
+        __slots__ = []
+        READ: _ClassVar[Permission.Type]
+        WRITE: _ClassVar[Permission.Type]
+        READWRITE: _ClassVar[Permission.Type]
+    READ: Permission.Type
+    WRITE: Permission.Type
+    READWRITE: Permission.Type
+    PERMTYPE_FIELD_NUMBER: _ClassVar[int]
+    KEY_FIELD_NUMBER: _ClassVar[int]
+    RANGE_END_FIELD_NUMBER: _ClassVar[int]
+    permType: Permission.Type
+    key: bytes
+    range_end: bytes
+    def __init__(self, permType: _Optional[_Union[Permission.Type, str]] = ..., key: _Optional[bytes] = ..., range_end: _Optional[bytes] = ...) -> None: ...
+
+class Role(_message.Message):
+    __slots__ = ["name", "keyPermission"]
+    NAME_FIELD_NUMBER: _ClassVar[int]
+    KEYPERMISSION_FIELD_NUMBER: _ClassVar[int]
+    name: bytes
+    keyPermission: _containers.RepeatedCompositeFieldContainer[Permission]
+    def __init__(self, name: _Optional[bytes] = ..., keyPermission: _Optional[_Iterable[_Union[Permission, _Mapping]]] = ...) -> None: ...

etcd3/_grpc_stubs/auth_pb2_grpc.py

@@ -0,0 +1,4 @@
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+"""Client and server classes corresponding to protobuf-defined services."""
+import grpc
+