Rename .py to .pyi.

2.7/zipimport.pyi

@@ -0,0 +1,16 @@
+"""Stub file for the 'zipimport' 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
+
+class zipimporter(object):
+    def find_module(a: str, *args, **kwargs) -> None: ...
+    def get_code(a: str) -> object: ...
+    def get_data(a: str) -> str:
+        raise IOError()
+    def get_filename(a: str) -> str: ...
+    def get_source(a: str) -> object: ...
+    def is_package(a: str) -> bool: ...
+    def load_module(a: str) -> object: ...