I personally like double quotes, because in so many other languages they are for strings, while single quotes are often for other things. But somehow many people have a single quotes obsession in Python. I am guessing, that it is because of ease of typing them on a US keyboard layout.
Not my problem. My problem is that I want to use them both, as I've been able to for many years.
I'll always use double to surround "can't" and single to surround '8.5" x 14"'. I'll use a context-appropriate pair when adding to existing code. But for all the other cases, I don't want to expend any energy on this. It's a complete non-issue.
> ease of typing them on a US keyboard layout
On both the US and European keyboards single-quotes are easier: no need to press Shift.
- easy: " ' , : * ! - _ = ( )
- harder (shift): numbers . µ ? / ℅ +
- hardest (Alt Gr): []{}€~|`^\@#
This is not exhaustive, but some of the most common symbols are quite hard to type: not surprising as most language designers use US keyboards. Still, I think everyone would benefit from a "symbols" layer on their keyboards.