>Sorry but it doesn't make any sense to me. If your argument is "a trailing comma is a good thing," it should go into any and all function calls/list declarations/et

No, the argument is quite specifically that a one line diff to add a new argument/element to the end of a list is preferable to a two line diff to do the same thing. The presence of the trailing comma is necessary to achieve that only when elements are on their own line.

▲ maratc 3 days ago | parent [-]

Ok, we're then back to `print` example:

    print(
        'Hello there from a very long line abcdefghijklmnopqrstuvwxyz',
        sep=' ', 
        end='\n', 
        file=None, 
        flush=False,
    )

All of the existing named parameters to `print()` function are already provided, and that standard function is highly unlikely to change. Should I add another string to `print`, I will have to do it before the named parameters anyway. There is no sense in the trailing comma here however you look at it.

Edit: sorry for using single quotes, in my 20 years of writing Python it was never an issue, but now with `black` it apparently is.

	▲	iainmerrick 2 days ago \| parent [-]
		I think this boils it down to the essence. Whether you use a trailing comma here, and whether you use single or double quotes, is just bike-shedding. If there's an automated tool that can make a consistent choice everywhere, that's worthwhile.