Message 150669 - Python tracker

FWIW, I'm for the first option for specifying package_data:

[files]
package_data =
    spam = first second third

I'm pretty sure this is how I ended up implementing it in d2to1, since I needed this functionality.

Theoretically spaces could be supported with an escape sequence, but I don't think that's worth complicating things for if package_data is deprecated anyways.  I'm all for making it difficult for anyone trying to include filenames with spaces in their source code.