Move warnings.pyi into 2and3/.

stdlib/2and3/warnings.pyi

@@ -0,0 +1,33 @@
+# Stubs for warnings
+
+# Based on http://docs.python.org/3.2/library/warnings.html
+
+from typing import Any, List, TextIO, Union
+
+def warn(message: Union[str, Warning], category: type = ...,
+         stacklevel: int = ...) -> None: ...
+
+def warn_explicit(message: Union[str, Warning], category: type, filename: str,
+                  lineno: int, module: str = ..., registry: Any = ...,
+                  module_globals: Any = ...) -> None: ...
+
+# logging modifies showwarning => make it a variable.
+def _showwarning(message: str, category: type, filename: str, lineno: int,
+                 file: TextIO = ..., line: str = ...) -> None: ...
+showwarning = _showwarning
+
+def formatwarning(message: str, category: type, filename: str, lineno: int,
+                  line: str = ...) -> None: ...
+def filterwarnings(action: str, message: str = ..., category: type = ...,
+                   module: str = ..., lineno: int = ...,
+                   append: bool = ...) -> None: ...
+def simplefilter(action: str, category: type = ..., lineno: int = ...,
+                 append: bool = ...) -> None: ...
+def resetwarnings() -> None: ...
+
+class catch_warnings:
+    # TODO record and module must be keyword arguments!
+    # TODO type of module?
+    def __init__(self, record: bool = ..., module: Any = ...) -> None: ...
+    def __enter__(self) -> List[Any]: ...
+    def __exit__(self, type, value, traceback) -> bool: ...