Merge Python 2 and 3 wsgiref (#2106)

* Merge Python 2 and 3 wsgiref

* Move wsigref to 2and3

stdlib/2and3/wsgiref/types.pyi

@@ -0,0 +1,41 @@
+# Type declaration for a WSGI Function
+#
+# wsgiref/types.py doesn't exist and neither does WSGIApplication, it's a type
+# provided for type checking purposes.
+#
+# This means you cannot simply import wsgiref.types in your code. Instead,
+# use the `TYPE_CHECKING` flag from the typing module:
+#
+#   from typing import TYPE_CHECKING
+#
+#   if TYPE_CHECKING:
+#       from wsgiref.types import WSGIApplication
+#
+# This import is now only taken into account by the type checker. Consequently,
+# you need to use 'WSGIApplication' and not simply WSGIApplication when type
+# hinting your code.  Otherwise Python will raise NameErrors.
+
+import sys
+from typing import Callable, Dict, Iterable, List, Optional, Tuple, Type, Union, Any
+from types import TracebackType
+
+_exc_info = Tuple[Optional[Type[BaseException]],
+                  Optional[BaseException],
+                  Optional[TracebackType]]
+if sys.version_info < (3,):
+    _Text = Union[unicode, str]
+    _BText = _Text
+else:
+    _Text = str
+    _BText = Union[bytes, str]
+WSGIEnvironment = Dict[_Text, Any]
+WSGIApplication = Callable[
+    [
+        WSGIEnvironment,
+        Union[
+            Callable[[_Text, List[Tuple[_Text, _Text]]], Callable[[_BText], None]],
+            Callable[[_Text, List[Tuple[_Text, _Text]], _exc_info], Callable[[_BText], None]]
+        ]
+    ],
+    Iterable[_BText]
+]

stdlib/2and3/wsgiref/validate.pyi

@@ -0,0 +1,50 @@
+import sys
+from typing import Any
+
+class WSGIWarning(Warning): ...
+
+def validator(application): ...
+
+class InputWrapper:
+    input = ...  # type: Any
+    def __init__(self, wsgi_input): ...
+    def read(self, *args): ...
+    if sys.version_info < (3,):
+        def readline(self): ...
+    else:
+        def readline(self, *args): ...
+    def readlines(self, *args): ...
+    def __iter__(self): ...
+    def close(self): ...
+
+class ErrorWrapper:
+    errors = ...  # type: Any
+    def __init__(self, wsgi_errors): ...
+    def write(self, s): ...
+    def flush(self): ...
+    def writelines(self, seq): ...
+    def close(self): ...
+
+class WriteWrapper:
+    writer = ...  # type: Any
+    def __init__(self, wsgi_writer): ...
+    def __call__(self, s): ...
+
+class PartialIteratorWrapper:
+    iterator = ...  # type: Any
+    def __init__(self, wsgi_iterator): ...
+    def __iter__(self): ...
+
+class IteratorWrapper:
+    original_iterator = ...  # type: Any
+    iterator = ...  # type: Any
+    closed = ...  # type: Any
+    check_start_response = ...  # type: Any
+    def __init__(self, wsgi_iterator, check_start_response): ...
+    def __iter__(self): ...
+    if sys.version_info < (3,):
+        def next(self): ...
+    else:
+        def __next__(self): ...
+    def close(self): ...
+    def __del__(self): ...