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Creating Filenames Platform-Independently Windows and Unix-related operating systems have different ways of denoting filenames. Windows filenames look like c:\directory\filename.ext, whereas Unix-style filenames look like /directory/filename.ext. If your Ruby scripts work with filenames and need to operate under both systems, the File class provides the join method. Under both systems, filenames (and complete paths) are built up from directory names and local filenames. For example, in the preceding examples, the directory is called directory, but on Windows backslashes are used as opposed to forward slashes.

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Note In recent versions of Ruby, it s possible to use Unix-style pathnames using forward slashes as

directory separators, rather than having to format filenames in a Windows style with backslashes. However, this section is included for completeness, or for instances where you need to work with libraries that don t respect Unix-style pathnames on other operating systems.

Next get the things done on the project that you can do quickly, to reduce the scope of the project. For example, if you already have on hand 10 preexisting graphics out of the 40 you need, adding them now to the storyboard means that you re 25 percent done, which will give you a better handle on the situation. The rst place to go to get graphics is your existing BBP presentations, if you have any. You ll be building a library of BBP presentations over time that will help your production process go faster each time. This library will save you effort as you build BBP presentations from scratch less and less. If you don t have previous BBP presentations, you might have some graphics in other presentations that you can use if they are simple and illustrate the point of a headline but if they are overly complex, or otherwise don t align with the BBP foundation of your storyboard, don t use them.

On Windows, you can use File.join to put together a filename using directory names and a final filename:

In some languages (such as C++, Pascal, or Ada), rebinding parameters and having these changes affect variables outside the function is an everyday thing. In Python, it s not directly possible: you can only modify the parameter objects themselves. But what if you have an immutable parameter, such as a number Sorry, but it can t be done. What you should do is return all the values you need from your function (as a tuple, if there is more than one). For example, a function that increments the numeric value of a variable by one could be written like this: >>> def inc(x): return x + 1 ... >>> foo = 10 >>> foo = inc(foo) >>> foo 11

File.join('full', 'path', 'here', 'filename.txt')

The Point A statement summarizes the challenge your supervisor faces, You haven t had a chance since last quarter to examine how things are working here. Where she wants to be at Point B is, You d like to be con dent things are working smoothly. How does she get from a state of uncertainty at Point A to con dence at Point B By following the simple Call to Action, Be assured we will meet our goals. Instead of leaving your boss unclear about what she should do, you now have presented information in a way that ensures that she can take action on it, even if that action is to believe something new or different in this case, to be assured of your progress. As shown in Figure 9-23, for this type of presentation you can change the Act II column headings from Key Point to Summary, from Explanation to Breakdown, and from Detail to Backup. As you write your Key Point (Summary) headlines, you ll cover the three most

Note Depending on how your system is set up, you might even see a forward-slash version of the preceding code on Windows, although that is technically a Unix-style path.

On Unix-related operating systems, such as Linux, the code is the same:

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If you really want to modify your parameter, you can use a little trick wrap your value in a list: >>> def inc(x): x[0] = x[0] + 1 ... >>> foo = [10] >>> inc(foo) >>> foo [11] Simply returning the new value is generally considered a cleaner solution.

File.join('full', 'path', 'here', 'filename.txt')