Make include_shebang_line clearer

[casey]

@pfmoore Check out this version, it should be clearer. We don't want to include the shebang line if we're on windows or if the interpreter is cmd. Strictly speaking, I don't think the second condition is required, since it's unlikely that anyone will use cmd anywhere but windows, but I wanted to change as little as possible.

[pfmoore]

Yep, that works fine. A shebang of #!py now (reliably) runs the script under Python on Windows¹.

Footnotes

1. Well, ignoring bug https://github.com/python/cpython/issues/99442 in Python 3.11, but that's their problem, not yours 🙂 And it will be fixed when 3.11.1 comes out. ↩

[casey]

Nice!