Nice Code Formatting Conversion On Python Site
The [documentation on the official Python site][1] site has a nice little design feature in its code examples. Each one starts out formatted for Python's "interactive interpreter" and show the expected results. For example, this snippet from the [Output Formatting][2] section:

If you click the little >>>
symbol in the upper left corner, the code instantly jumps to a format suitable for being run in a file. The expected out also disappears making the snippet ready to copy and paste directly into a file.

That's an incredibly useful feature. Very nicely done, Python doc crew.
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Footnotes
[1]: http://python.org/doc/
[2]: http://docs.python.org/3/tutorial/stdlib2.html#output-formatting