Doctest Mode: Walk-Through (3/8)

Write a few test cases. Don't worry about filling in the output for now. When you hit enter, doctest-mode will add a new prompt (automatically selecting between "..." and ">>>"), and indent when appropriate. As in python-mode, you can use tab and backspace to indent or dedent.

When you are finished, simply hit enter twice in a row -- when you hit enter with the cursor on an empty prompt, doctest-mode will delete that prompt and return you to text-editing mode.

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Hello world.  This file will contain some simple tests.

    >>> len('european swallow')
    >>> 'european swallow'.count('a')
    >>> for word in 'european swallow'.split():
    ...     print word, len(word)

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