Add That Trailing Comma

Lets say you wrote this simple code and at first things were going well.

Then after a while a friend came in and did a little fix.

But things started falling apart, after a lot of digging in - you find this.

Python will join two string together in this case, not what you wanted. Always leave a trailing comma.

Couple more things:

• As Dave Cheney pointed out, using this practice has the nice effect that one line change shows as one line change in the diff since you don''t have to add a comma to the previous line.
• Go probably learned from Python and made trailing comma mandatory.
• You can see more Python "gotchas" here.