add (overwrite with) mypy stubs, if available

stdlib/3/tarfile.pyi

@@ -0,0 +1,33 @@
+# TODO these are incomplete
+
+from typing import Any, List, overload, Callable
+
+class TarError(Exception): ...
+
+class TarInfo:
+    name = ''
+    size = 0
+    uid = 0
+    gid = 0
+
+class TarFile:
+    def getmember(self, name: str) -> TarInfo: ...
+    def getmembers(self) -> List[TarInfo]: ...
+    def getnames(self) -> List[str]: ...
+    def extractall(self, path: str = ".",
+                   members: List[TarInfo] = None) -> None: ...
+
+    @overload
+    def extract(self, member: str, path: str = "",
+                set_attrs: bool = True) -> None: ...
+    @overload
+    def extract(self, member: TarInfo, path: str = "",
+                set_attrs: bool = True) -> None: ...
+
+    def add(self, name: str, arcname: str = None, recursive: bool = True,
+            exclude: Callable[[str], bool] = None, *,
+            filter: 'Callable[[TarFile], TarFile]' = None) -> None: ...
+    def close(self) -> None: ...
+
+def open(name: str = None, mode: str = 'r', fileobj: Any = None, bufsize: int = 10240,
+         **kwargs) -> TarFile: ...