@zzzeek@brettcannon the ability to share information within a single copy-paste is really valuable. Imagine getting bug reports with a .py file that embeds all of its requirements metadata such that you can immediately run it with locked dependencies at precise versions. Once you need 2 files, complexity for sharing in a bug tracker comment goes through the roof. Same for anywhere else you can paste a blob of text.
@brettcannon looks like a tough spot, first I'm seeing this and my initial impression, which is worth nothing, is "why?" , but given that, certainly using a format we already have and is extensible is preferable to "let's make a whole new format that's "easy"", because any format that's "easy" only seems that way because it hasnt matured.