I gave it a try on Windows and ran into an issue, but found a workaround.

I'm using WinPython 3.6 on Windows 7. I did "pip install streamlit" and then "streamlit hello", and had to allow it through the firewall, then got a 404 page.

The workaround is very simple, just use the provided http address and add "index.html":

    http://localhost:8501/index.html

This link has more info: https://github.com/streamlit/streamlit/issues/244