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Assuming that the installation went well, you now have a new program in your Windows Start menu. Run the Python Integrated Development Environment (IDLE) by selecting Start Programs Python2 IDLE (Python GUI). You should now see a window that looks like the one shown in Figure 1-1. If you feel a bit lost, simply select Help IDLE Help from the menu, and you get a simple description of the various menu items and basic usage. For more documentation on IDLE, check out http:// www.python.org/idle. (Here you will also find more information on running IDLE on platforms other than Windows.) If you press F1, or select Help Python Docs from the menu, you will get the full Python documentation. (The document there of most use to you will probably be the Library Reference. ) All the documentation is searchable.

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{"difference"=>2, "sum"=>8}

Note This program requires your computer to have access to the Internet. Also, if the XML-RPC sample

What Will You Show, Say, and Do in the First Five Slides Starting with the Title and Byline Choosing a Story Thread Orienting the Audience with the Setting Headline Interesting the Audience with the Role Headline Engaging the Audience with the Point A Headline Motivating the Audience with the Point B Headline Creating Dramatic Tension Between the Point A and Point B Headlines Focusing the Audience with the Call to Action Headline Choosing a Pattern to Follow Closing the Curtain on Act I Reviewing the Five Headlines Appealing to Your Audience s Emotions Focusing Your Ideas 10 Tips for Enhancing Act I

server is unavailable, you might get an error message. Try a few times if you fail to get a result as this sample file is often under heavy use.

Note If you followed the installation instructions earlier in this chapter, you may have put your Python installation in ~/python already, but because that has a subdirectory of its own (such as ~/python/ Python-2.4/), this shouldn t cause any problems. If you would rather put your own programs somewhere else, feel free to use a directory such as ~/my_python_programs.

This example uses a remote application (written in PHP) that makes available a method called sample.sumAndDifference. First you create a handle that refers to the remote program using XMLRPC::Client.new2, then you call the method with two parameters. The results (the sum and the difference of your two arguments) come back in a hash. Because dealing with remote programs can lead to errors (bad connections, remote service is unavailable, and so on), it makes sense to process errors that come back from RPC calls. XML-RPC offers a call2 method that makes this easy:

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require 'xmlrpc/client' server = XMLRPC::Client.new2("http://xmlrpc-c.sourceforge.net/api/sample.php") ok, results = server.call2("sample.sumAndDifference", 5, 3) if ok puts results.inspect else puts results.faultCode puts results.faultString end call2 returns an array containing a success flag and the results. You can check to see

if the first element of the array (the success flag) is true, but if not, you can investigate the error.

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Making an XML-RPC Enabled Program Calling XML-RPC enabled programs is easy, but so is XML-RPC enabling your own:

Got that Don t close the window with your program in it. If you did, just open it again (File Open). Now you can run it with Edit Run script, or by pressing Ctrl-F5. (If you aren t using IDLE, see the next section about running your programs from the command prompt.) What happens Hello, world! is printed in the interpreter windows, which is exactly what we wanted. The interpreter prompt is gone, but you can get it back by pressing Enter (in the interpreter window). Let s extend our script to the following: name = raw_input("What is your name ") print "Hello, " + name + "!"

require 'xmlrpc/server' server = XMLRPC::Server.new(1234) server.add_handler("sample.sumAndDifference") do |a,b| { "sum" => a.to_i + b.to_i, "difference" => a.to_i - b.to_i } end

This program runs an XML-RPC server (based on WEBrick) on your local machine on port 1234, and operates in the same way as the sample.php used in the client in the previous section. The following client could use the sample.sumAndDifference method made available by the preceding server:

The Problems of Sequence and Priority Three Columns of Clarity Threading the Eye of the Needle Using a Hierarchy Prioritizing Your Slides Justifying the Call to Action Headline with the Key Point Headlines Clarifying Each Key Point Headline with Its Explanation Headlines Backing Up Each Explanation Headline with Its Detail Headlines Fleshing Out the Rest of Act II Pulling Through What s Most Important First Lowering the Curtain on Your Story Template 10 Tips for Enhancing Your Story Template