You should just be using "import index". By using "import index.py", you're telling the interpreter to first import index, execute the code in it, then look for a sub-module named "py" (full name: index.py). Since no such sub-module exists, and index is not a package, you get the exception you're seeing.

It's like "import os.path": first import "os", then look for "path" inside of that.