stubs for sndhdr (#1070)

stdlib/2and3/sndhdr.pyi

@@ -0,0 +1,25 @@
+# Stubs for sndhdr (Python 2 and 3)
+
+import os
+import sys
+from typing import Any, NamedTuple, Optional, Tuple, Union
+
+if sys.version_info >= (3, 5):
+    SndHeaders = NamedTuple('SndHeaders', [
+        ('filetype', str),
+        ('framerate', int),
+        ('nchannels', int),
+        ('nframes', int),
+        ('sampwidth', Union[int, str]),
+    ])
+    _SndHeaders = SndHeaders
+else:
+    _SndHeaders = Tuple[str, int, int, int, Union[int, str]]
+
+if sys.version_info >= (3, 6):
+    _Path = Union[str, bytes, os.PathLike[Any]]
+else:
+    _Path = Union[str, bytes]
+
+def what(filename: _Path) -> Optional[_SndHeaders]: ...
+def whathdr(filename: _Path) -> Optional[_SndHeaders]: ...