Simple .NET/ASP.NET PDF document editor web control SDK

(I might, of course, just as well have used repr, which means the same thing, but may be a bit clearer. Actually, in this case, I could also have used str. Don t worry too much about this right now.) In short: str, repr, and backticks are three ways of converting a Python value to a string. The function str makes it look good, while repr (and the backticks) tries to make the resulting string a legal Python expression.

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This makes gem go to the remote gem repository, look for new versions of all the gems you currently have installed, and if there are new versions, installs them. If you only want to upgrade a specific gem, suffix the preceding command line with the name of the gem in question. Uninstalling gems is the simplest task of all. Use the uninstall command (where feedtools is replaced by the name of the gem you wish to uninstall):

9

If there are multiple versions of the same gem on the machine, gem will ask you which version you want to uninstall first (or you can tell it to uninstall all versions at once), as in this example:

Naturally, it s possible to create gems from your own libraries and applications. This entire process is covered in 10, along with the other ways you can deploy your applications to users (or the world!).

The Setting headline in the story template, Bob Ernst is dead, quickly oriented the jurors to the context for the trial Bob Ernst had died of a heart attack. As described in 1, this clear and direct statement is the foundation for the Setting slide, which in this example included three variations of a single photograph, here presented across three slides in Figure 9-2. The headlines of all the Act I slides are hidden in this and the rest of the examples in this chapter. Although you should keep the headlines visible through most of Act II because they guide understanding of the in-depth new information on your Explanation and Detail slides, they are not essential in Act I because here you are primarily making an emotional impact, and as always, your narration will supply the verbal information that synchronizes with your visual slides.

Now you know what "Hello, " + name + "!" means. But what about raw_input Isn t input good enough Let s try it. Enter the following in a separate script file: name = input("What is your name ") print "Hello, " + name + "!" This is a perfectly valid program, but as you will soon see, it s a bit unpractical. Let s try to run it: What is your name Gumby Traceback (most recent call last): File "C:/python/test.py", line 2, in name = input("What is your name ") File "<string>", line 0, in NameError: name 'Gumby' is not defined The problem is that input assumes that what you enter is a valid Python expression (it s more or less the inverse of repr). If you write your name as a string, that s no problem: What is your name "Gumby" Hello, Gumby! However, it s just a bit too much to ask that the user write his or her name in quotes like this; therefore we use raw_input, which treats all input as raw data, and puts it into a string: >>> input("Enter a number: ") Enter a number: 3 3 >>> raw_input("Enter a number: ") Enter a number: 3 '3' Unless you have a special need for input, you should probably use raw_input.

Summary

In this chapter we ve looked at some of the methods Ruby provides to make it possible to handle larger projects, as well as access the vast universe of prewritten code libraries to make development easier.