Add fileinput .pyi for Python 2.7. (#572)

stdlib/2.7/fileinput.pyi

@@ -0,0 +1,46 @@
+from typing import Iterable, Callable, IO, Optional, Union, Iterator
+
+class FileInput(Iterable[str]):
+    def __init__(
+        self,
+        files: Optional[Union[str, Iterable[str]]] = None,
+        inplace: bool = ...,
+        backup: str = ...,
+        bufsize: int = ...,
+        mode: str = ...,
+        openhook: Callable[[str, str], IO[str]] = ...
+        ) -> None: ...
+
+    def __del__(self) -> None: ...
+    def close(self) -> None: ...
+    def __iter__(self) -> Iterator[str]: ...
+    def __getitem__(self, i: Union[int, slice]) -> str: ...
+    def next(self) -> str: ...
+    def nextfile(self) -> None: ...
+    def readline(self) -> str: ...
+    def filename(self) -> Optional[str]: ...
+    def lineno(self) -> int: ...
+    def filelineno(self) -> int: ...
+    def fileno(self) -> int: ...
+    def isfirstline(self) -> bool: ...
+    def isstdin(self) -> bool: ...
+
+def input(
+    files: Optional[Union[str, Iterable[str]]] = None,
+    inplace: bool = ...,
+    backup: str = ...,
+    bufsize: int = ...,
+    mode: str = ...,
+    openhook: Callable[[str, str], IO[str]] = ...) -> FileInput: ...
+
+
+def filename() -> Optional[str]: ...
+def lineno() -> int: ...
+def filelineno() -> int: ...
+def isfirstline() -> bool: ...
+def isstdin() -> bool: ...
+def nextfile() -> None: ...
+def close() -> None: ...
+
+def hook_compressed(filename: str, mode: str) -> IO[str]: ...
+def hook_encoded(encoding: str) -> Callable[[str, str], IO[str]]: ...