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Strings are values, just like numbers are: >>> "Hello, world!" 'Hello, world!' There is one thing that may be a bit surprising about this example, though: When Python printed out our string, it used single quotes, whereas we used double quotes. What s the difference Actually, there is no difference: >>> 'Hello, world!' 'Hello, world!' Here, too, we use single quotes, and the result is the same. So why allow both Because in some cases it may be useful: >>> "Let's go!" "Let's go!" >>> '"Hello, world!" she said' '"Hello, world!" she said' In the preceding code, the first string contains a single quote (or apostrophe, as we should perhaps call it in this context), and therefore we can t use single quotes to enclose the string. If we did, the interpreter would complain (and rightly so): >>> 'Let's go!' SyntaxError: invalid syntax Here, the string is 'Let', and Python doesn t quite know what to do with the following s (or the rest of the line, for that matter). In the second string, we use double quotes as part of our sentence. Therefore, we have to use single quotes to enclose our string, for the same reasons as stated previously. Or, actually

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ruby 1.8.2 (2004-12-25) [i686-linux]

FIGURE 7-1 This chapter will guide you through the process of sketching every slide in your storyboard.

This means that Ruby 1.8.2 is installed on the machine. This book requires 1.8.2 as a bare minimum, so if the version is less than 1.8.2 you ll need to continue onward in this chapter and install a more recent version of Ruby. However, if Ruby appears to be installed and up to date, try to run the irb interactive Ruby interpreter, as follows:

On some systems, irb might have a slightly different name. For example, on Ubuntu it can sometimes Tip

A very important string method, split is the inverse of join, and is used to split a string into a sequence: >>> '1+2+3+4+5'.split('+') ['1', '2', '3', '4', '5'] >>> '/usr/bin/env'.split('/') ['', 'usr', 'bin', 'env'] >>> 'Using the default'.split() ['Using', 'the', 'default'] Note that if no separator is supplied, the default is to split on all runs of consecutive whitespace characters (spaces, tabs, newlines, and so on). See also: join. In Appendix B: rsplit, splitlines.

Just as you wrote the verbal essence of your presentation in the story template, your focus now is to sketch the visual essence in the storyboard. Again, don t worry about the artistic quality of the sketches they are only temporary placeholders for the graphics you ll add to each slide later. So let s get started at the start, by reviewing a range of sketching possibilities for your Act I slides.

be called irb1.8, and you ll need to run it as such. To find it, you can use find / -name "irb" maxdepth 4.

Once you ve run irb, you should get the following output:

If running irb results in a similar output, you can move on to 2. (You might wish to type exit and press Enter to get back to the command line!) Otherwise, read on to install a new version of Ruby.

7

The installation procedure for Ruby on Linux varies between different Linux distributions. Some distributions, such as Gentoo, Debian, and Red Hat, provide package managers to make installation of programs easy. Others require that you install directly from source or install a package manager beforehand. If you re comfortable with using emerge, rpm, or apt-get, you can install Ruby quickly with the following methods: RPM: Download Ruby RPMs and install with rpm Uhv ruby-*.rpm Gentoo: Use emerge as follows: emerge ruby Debian: Use apt-get: sudo apt-get install ruby Ubuntu: Use apt-get as with Debian. You might also need to install irb explicitly. In the case of Ruby 1.8, this line should work:

The strip method returns a string where whitespace on the left and right (but not internally) has been stripped (removed): >>> ' internal whitespace is kept 'internal whitespace is kept' '.strip()

If one of these methods works for you, try to run Ruby and irb as shown in the preceding section, and progress to 2 if you re ready. Alternatively, you can search your distribution s package repository for Ruby, as the name for the Ruby package in your distribution might be nonstandard or changing over time. However, if all else fails, you can install Ruby directly from its source code in the next section.