Rename .py to .pyi.

2.7/zlib.pyi

@@ -0,0 +1,31 @@
+"""Stub file for the 'zlib' module."""
+# This is an autogenerated file. It serves as a starting point
+# for a more precise manual annotation of this module.
+# Feel free to edit the source below, but remove this header when you do.
+
+from typing import List, Tuple, Dict, Undefined, GenericType
+
+def adler32(a, *args, **kwargs) -> int: ...
+
+def compress(a, *args, **kwargs) -> str:
+    raise MemoryError()
+
+def compressobj(*args, **kwargs) -> object:
+    raise MemoryError()
+    raise ValueError()
+
+def crc32(a, *args, **kwargs) -> int: ...
+
+def decompress(a, *args, **kwargs) -> str:
+    raise MemoryError()
+
+def decompressobj(*args, **kwargs) -> object:
+    raise MemoryError()
+    raise ValueError()
+
+
+class Compress(object):
+    pass
+
+class Decompress(object):
+    pass