Yeah, the naming was pretty bad for a while, but it seems today `#!/usr/bin/env python3` is a safe bet. And pip/virtualenv should not matter - remember, we've are talking about "python-without-dependencies"

As for tabs vs spaces - I really don't get it... My editor (emacs) picks the style automatically, I don't think I even had to set this up. But most of the python code I see use 2 or 4 spaces, so if someone puts tabs, it's immediately visible 8-character indents, which makes me alert (and then I turn on whitespace highlighting in my editor).