On 2015-09-03 14:48, Peter Otten wrote:
The only reason I see to add an extra comma are smaller and easier
to read diffs when you make a change:
While that's the primary reason I do it, it's also helpful if you
have a bunch of named keyword arguments and want sort/rearrange them
(usually for clarity/grouping). You don't have to worry about finding
the previous-last-item and adding a comma to it and then finding the
new-last-item and removing its comma. Also, when adding a new
item, you can just copy an existing line, paste it, and modify the
salient parts without needing to append a comma to one line or
delete it from the pasted line.
But the improvement in diff output? That's a big win for me.
I notice it most when I *can't* use it, like in writing SQL:
col3, -- grr, can't do this
so my SQL diffs are the "removed this line and replaced it with
something almost identical except it now has a comma". Harumph.