From 97a6d27558d3c01b5d69c886d17f8d0beb4d9edc Mon Sep 17 00:00:00 2001
From: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Date: Fri, 9 Dec 2016 16:52:03 -0800
Subject: [PATCH] Make first argument to `filter` optional

```
$ python3.4
Python 3.4.3 (default, Nov 17 2016, 01:08:31)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> list(filter(None, [False, True]))
[True]
>>>
```
---
 stdlib/3/builtins.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/3/builtins.pyi b/stdlib/3/builtins.pyi
index 7bf2f962a..3847506a8 100644
--- a/stdlib/3/builtins.pyi
+++ b/stdlib/3/builtins.pyi
@@ -696,7 +696,7 @@ def eval(source: str, globals: Dict[str, Any] = None,
 def exec(object: str, globals: Dict[str, Any] = None,
          locals: Mapping[str, Any] = None) -> Any: ...  # TODO code object as source
 def exit(code: int = None) -> None: ...
-def filter(function: Callable[[_T], Any], iterable: Iterable[_T]) -> Iterator[_T]: ...
+def filter(function: Optional[Callable[[_T], Any]], iterable: Iterable[_T]) -> Iterator[_T]: ...
 def format(o: object, format_spec: str = '') -> str: ...
 def getattr(o: Any, name: str, default: Any = ...) -> Any: ...
 def globals() -> Dict[str, Any]: ...