Let's talk about trailing commas in Python.
When I'm make a multi-line list, dictionary, tuple or function call (see wrap a long line in Python), I prefer to put the closing bracket or brace on its own line:
...
This is a premium screencast available only to active Python Morsels subscribers.
Feel free to watch some of the free screencasts in the Overlooked Fundamentals series.
Need to fill-in gaps in your Python skills? I send weekly emails designed to do just that.