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If you ve used Linux or downloaded certain types of software, you might be familiar with the term open source Simply, open source means that the source code to an application or library is made available publicly for other people to look at and use There might be restrictions on what people can do with the code (generally via a license), but it s publicly viewable Much like Linux, Ruby, along with nearly all its libraries, is released under an open source license in contrast to, say, Microsoft Windows, whose source code isn t readily available The terms of Ruby s license don t require that any applications you produce with Ruby also need to be made open source You can develop proprietary closed source applications with Ruby and never let anyone else see the code.

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A striking way to set up your CTA+3 slides is to use a distinctive layout to make them stand out among all the other slides in the storyboard. In 6, you set up a preliminary medium gray background on the Key Point slides when you set up the storyboard. You can change those placeholder backgrounds to something more striking for example, by using a split-screen layout on the Key Point slides. This layout style, shown in Figure 7-13, is a quick and easy way to set up these slides for sketches, and it s a particularly good t for using icons as described earlier in this chapter.

Choosing whether to release your code as open source or not can be a tough decision (You can read the full text of Ruby s license in Appendix B) There are often shades of gray in the open source versus closed source decision When 37signals developed the first Ruby on Rails powered application, Basecamp, they didn t release the source openly, but they did extract the Ruby on Rails framework and release that as open source The result is that their company has received a lot of publicity, and 37signals has hired some great coders who worked on Ruby on Rails for free, benefiting everybody Software products such as the popular Apache Web server and the MySQL database system are also available under varying open source licenses and are routinely improved by unpaid coders.

The open source community is one of sharing knowledge freely and collaborating to improve the systems and services that most of us use Although proprietary software will always have its place, open source is rapidly becoming the de facto way to develop programming languages, libraries, and other non-application types of software Understanding open source is an important key to understanding the Ruby community Although many developers don t necessarily open source the code to their applications, they ll often release the tools and code tricks to the community so that they can benefit from the peer review and popularity that results..

In 8, you ll explore PowerPoint features to set up and apply different layouts to the different levels of the storyboard. For now, if you want to quickly set up these slides to see how they look when you sketch on them in split-screen layout format, go to Normal view for the rst Key Point slide. On the Insert tab, in the Illustrations group, click Shapes and then select Rectangle. Position the cursor in the upper right of the slide, click

Releasing your code as open source isn t necessarily a bad business decision. It could actually improve the quality of your code and tools, and make you much better known in the industry.

The update method updates one dictionary with the items of another: >>> d = { 'title': 'Python Web Site', 'url': 'http://www.python.org', 'changed': 'Mar 14 22:09:15 MET 2005' } >>> x = {'title': 'Python Language Website'} >>> d.update(x) >>> d {'url': 'http://www.python.org', 'changed': 'Mar 14 22:09:15 MET 2005', 'title': 'Python Language Website'} The items in the supplied dictionary are added to the old one, overwriting any items there with the same keys. The update method can be called in the same way as the dict function (or type constructor), as discussed earlier in this chapter. This means that update can be called with a mapping, a sequence (or other iterable object) of (key, value) pairs, or with keyword arguments.