Make builtins work

One change is a Jedi issue, Jedi cannot really deal with __new__.
The other is a typeshed issue. "function" should not be defined in the stubs.

stdlib/2/__builtin__.pyi

@@ -869,6 +869,7 @@ class slice(object):
 
 class tuple(Sequence[_T_co], Generic[_T_co]):
     def __new__(cls: Type[_T], iterable: Iterable[_T_co] = ...) -> _T: ...
+    def __init__(self, iterable: Iterable[_T_co] = ...): ...
     def __len__(self) -> int: ...
     def __contains__(self, x: object) -> bool: ...
     @overload
@@ -892,15 +893,6 @@ class tuple(Sequence[_T_co], Generic[_T_co]):
     else:
         def index(self, x: Any) -> int: ...
 
-class function:
-    # TODO not defined in builtins!
-    __name__: str
-    __module__: str
-    __code__: CodeType
-    if sys.version_info >= (3,):
-        __qualname__: str
-        __annotations__: Dict[str, Any]
-
 class list(MutableSequence[_T], Generic[_T]):
     @overload
     def __init__(self) -> None: ...

stdlib/2and3/builtins.pyi

@@ -869,6 +869,7 @@ class slice(object):
 
 class tuple(Sequence[_T_co], Generic[_T_co]):
     def __new__(cls: Type[_T], iterable: Iterable[_T_co] = ...) -> _T: ...
+    def __init__(self, iterable: Iterable[_T_co] = ...): ...
     def __len__(self) -> int: ...
     def __contains__(self, x: object) -> bool: ...
     @overload
@@ -892,15 +893,6 @@ class tuple(Sequence[_T_co], Generic[_T_co]):
     else:
         def index(self, x: Any) -> int: ...
 
-class function:
-    # TODO not defined in builtins!
-    __name__: str
-    __module__: str
-    __code__: CodeType
-    if sys.version_info >= (3,):
-        __qualname__: str
-        __annotations__: Dict[str, Any]
-
 class list(MutableSequence[_T], Generic[_T]):
     @overload
     def __init__(self) -> None: ...

stdlib/2and3/sqlite3/dbapi2.pyi

@@ -154,7 +154,7 @@ class Connection(object):
                    progress: Optional[Callable[[int, int, int], object]] = ..., name: str = ...,
                    sleep: float = ...) -> None: ...
     def __call__(self, *args, **kwargs): ...
-    def __enter__(self, *args, **kwargs): ...
+    def __enter__(self, *args, **kwargs) -> Connection: ...
     def __exit__(self, *args, **kwargs): ...
 
 class Cursor(Iterator[Any]):