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print 'Received redundant parameters:', others return pow(x, y) def interval(start, stop=None, step=1): 'Imitates range() for step > 0' if stop is None: # If the stop is not supplied... start, stop = 0, start # shuffle the parameters result = [] i = start # We start counting at the start index while i < stop: # Until the index reaches the stop index... result.append(i) # ...append the index to the result... i += step # ...increment the index with the step (> 0) return result Now let s try them out: >>> print story(job='king', name='Gumby') Once upon a time, there was a king called Gumby. >>> print story(name='Sir Robin', job='brave knight') Once upon a time, there was a brave knight called Sir Robin. >>> params = {'job': 'language', 'name': 'Python'} >>> print story(**params) Once upon a time, there was a language called Python. >>> del params['job'] >>> print story(job='stroke of genius', **params) Once upon a time, there was a stroke of genius called Python. >>> power(2,3) 8 >>> power(3,2) 9 >>> power(y=3,x=2) 8 >>> params = (5,) * 2 >>> power(*params) 3125 >>> power(3, 3, 'Hello, world') Received redundant parameters: ('Hello, world',) 27 >>> interval(10) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> interval(1,5) [1, 2, 3, 4] >>> interval(3,12,4) [3, 7, 11] >>> power(*interval(3,7)) Received redundant parameters: (5, 6) 81

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Next abbreviate your Call to Action headline to read Solve the DNA puzzle, as shown on the upper left in Figure 9-30. Search for the term custom puzzle on the Web, and you ll nd many companies that will create a custom jigsaw puzzle using your DNA photograph for as little as $11. If you have the budget, buy one, and now while you present the Call to Action slide as you relate the hidden headline Solve the DNA puzzle in three steps, hand out the actual pieces of the custom DNA puzzle to the students so that they literally hold the motif in their hands. Tell your students that they now hold in their hands the puzzle they will solve, and ask them for their thoughts about how they think they can solve it.

One simple type of database can be stored in a text file in a format commonly known as CSV. CSV stands for Comma-Separated Values, and means that for each item of data you re storing, you can have multiple attributes separated with commas. The dummy data in your text.txt file in the previous section used CSV data. To recap, text.txt initially contained this code:

Fred Bloggs,Manager,Male,45 Laura Smith,Cook,Female,23 Debbie Watts,Professor,Female,38

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Each line represents a different person, and commas separate the attributes relating to each person. The commas allow you to access (and change) each attribute separately. Ruby s standard library includes a library called csv that allows you to use text files containing CSV data as simple databases that are easy to read, create, and manipulate.

Feel free to experiment with these functions and functions of your own until you are confident that you understand how this stuff works.

The CSV class provided by csv manages the manipulation of the data for you:

As you create your Key Point (Lesson) slides, leave your headlines visible, but delete some of the puzzle pieces from the rst Key Point slide, Assemble the theory (upper right); delete more pieces from the second Key Point slide, Assemble the research, (lower left); and last delete all of the pieces from the third slide, Apply what you know (lower right). Create the rest of the slides from the headlines of the story template, using these Key Point slides to guide you and your students through the engaging experience of solving the DNA puzzle.

["Fred Bloggs", "Manager", "Male", "45"] ["Laura Smith", "Cook", "Female", "23"] ["Debbie Watts", "Professor", "Female", "38"]

You open the text.txt file by using CSV.open, and each line (that is, each individual person in the file) is passed into the block one by one. The inspect method demonstrates that each entry is now represented in array form. This makes it easier to read the data than when it was in its plain text form. You can also use CSV alongside the File class: