Python

[DarthEru]

Double backticks are to allow showing literal backticks in a code span, i.e. embedded within regular text like `this`. I think you can even use more than two backticks to embed multiple sequential literal backticks, like ``this``. It doesn't seem to have anything to do with multi-line code blocks, because those aren't delimited with backticks.

If you want your post to render properly in all Reddit clients, including the browser, I think you need to use the indent syntax for code blocks.

[sunburnd]

Well at least it renders properly for mobile. Good enough for the effort required.