Add IO protocols to _typeshed (#4230)

stdlib/3/json/__init__.pyi

@@ -1,5 +1,6 @@
 import sys
-from typing import Any, IO, Optional, Tuple, Callable, Dict, List, Union, Protocol, Type
+from typing import Any, IO, Optional, Tuple, Callable, Dict, List, Union, Type
+from _typeshed import SupportsRead
 
 from .decoder import JSONDecoder as JSONDecoder
 from .encoder import JSONEncoder as JSONEncoder
@@ -33,7 +34,7 @@ def dump(obj: Any,
          **kwds: Any) -> None: ...
 
 if sys.version_info >= (3, 6):
-    _LoadsString = Union[str, bytes, bytearray]
+    _LoadsString = Union[str, bytes]
 else:
     _LoadsString = str
 def loads(s: _LoadsString,
@@ -46,10 +47,7 @@ def loads(s: _LoadsString,
           object_pairs_hook: Optional[Callable[[List[Tuple[Any, Any]]], Any]] = ...,
           **kwds: Any) -> Any: ...
 
-class _Reader(Protocol):
-    def read(self) -> _LoadsString: ...
-
-def load(fp: _Reader,
+def load(fp: SupportsRead[_LoadsString],
          *,
          cls: Optional[Type[JSONDecoder]] = ...,
          object_hook: Optional[Callable[[Dict[Any, Any]], Any]] = ...,

stdlib/3/xmlrpc/client.pyi

@@ -4,19 +4,15 @@ import time
 import gzip
 import http.client
 
-from typing import Any, Callable, Dict, Iterable, List, Mapping, Optional, Protocol, Text, Tuple, Type, TypeVar, Union, overload
+from typing import Any, Callable, Dict, Iterable, List, Mapping, Optional, Protocol, Text, Tuple, Type, Union, overload
 from typing_extensions import Literal
 from types import TracebackType
 from datetime import datetime
+from _typeshed import SupportsRead, SupportsWrite
 
-_T = TypeVar("_T")
-class _HasTimeTuple(Protocol):
+class _SupportsTimeTuple(Protocol):
     def timetuple(self) -> time.struct_time: ...
-class _HasWrite(Protocol):
-    def write(self, __o: str) -> None: ...
-class _HasRead(Protocol):
-    def read(self) -> bytes: ...
-_DateTimeComparable = Union[DateTime, datetime, str, _HasTimeTuple]
+_DateTimeComparable = Union[DateTime, datetime, str, _SupportsTimeTuple]
 _Marshallable = Union[None, bool, int, float, str, bytes, tuple, list, dict, datetime, DateTime, Binary]
 _XMLDate = Union[int, datetime, Tuple[int, ...], time.struct_time]
 _HostType = Union[Tuple[str, Dict[str, str]], str]
@@ -77,7 +73,7 @@ class DateTime:
     def make_comparable(self, other: _DateTimeComparable) -> Tuple[str, str]: ...  # undocumented
     def timetuple(self) -> time.struct_time: ...  # undocumented
     def decode(self, data: Any) -> None: ...
-    def encode(self, out: _HasWrite) -> None: ...
+    def encode(self, out: SupportsWrite[str]) -> None: ...
 
 def _datetime(data: Any) -> DateTime: ...  # undocumented
 def _datetime_type(data: str) -> datetime: ...  # undocumented
@@ -88,7 +84,7 @@ class Binary:
 
     def __init__(self, data: Optional[bytes] = ...) -> None: ...
     def decode(self, data: bytes) -> None: ...
-    def encode(self, out: _HasWrite) -> None: ...
+    def encode(self, out: SupportsWrite[str]) -> None: ...
 
 def _binary(data: bytes) -> Binary: ...  # undocumented
 
@@ -204,7 +200,7 @@ class GzipDecodedResponse(gzip.GzipFile):  # undocumented
 
     io: io.BytesIO
 
-    def __init__(self, response: _HasRead) -> None: ...
+    def __init__(self, response: SupportsRead[bytes]) -> None: ...
     def close(self) -> None: ...
 
 class _Method:  # undocumented