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A fun way to demonstrate that Python comes with batteries included is to enter a directory on your system and run the SimpleHTTPServer Standard Library module as a stand-alone program: $ python -m SimpleHTTPServer Serving HTTP on 0.0.0.0 port 8000 ... If you direct your browser to localhost:8000, you will see the contents of this script's current directory displayed for browsing, such as the listings provided by Apache when a site leaves a directory browsable. Documents and images will load in your web browser when selected, based on the content types chosen through the best guesses of the mimetypes Standard Library module. The SimpleHTTPServer is a subclass of BaseHTTPServer, which is also the foundation of the wsgiref.simple_server that we looked at earlier. Before the WSGI standard was invented, small Python programs could subclass BaseHTTPServer if they needed to answer raw HTTP requests. This is actually a common difference between the old mechanisms by which Python programs provided extensibility, and the more modern and Pythonic mechanisms. It used to be popular to write a class with stub methods inside, and then tell programmers to extend it by subclassing and defining those methods; today, we use namespaces, callables, and duck-typed objects to provide much cleaner forms of extensibility. For example, today an object like start_response is provided as an argument (dependency injection), and

Figure 9-4. The same widget shows different tooltips for different parts. Let s get started with intercepting the right event and set the tooltip text for each of the four squares. All events are passed through the event method before some of them are distributed to the different handlers, such as the paintEvent, mouseMoveEvent, and keyPressEvent methods. Because there is no toolTipEvent method, you have to intercept the event in the event method. The source code for the interception is shown in Listing 9-5. Because the event method receives a QEvent object, you must use the type property to determine whether a ToolTip event was received. The QEvent class is the base class for all specialized event classes, so as soon as you can tell that you are dealing with a tooltip, you can cast the QEvent object into a QHelpEvent object.

the WSGI standard specifies its behavior rather than its inheritance tree (duck typing).The Standard Library includes two other HTTP servers: CGIHTTPServer takes the SimpleHTTPServer and, instead of just serving static files off of the disk, it adds the ability to run CGI scripts (which we will cover in the next section). SimpleXMLRPCServer and DocXMLRPCServer each provide a server endpoint against which client programs can make XML-RPC remote procedure calls, as demonstrated in 18 and Listing 22-1. This protocol uses XML files submitted through HTTP requests.

Image readers and writers work with QIODevice objects so an image can be read or written from, Tip and to network streams, memory buffers, files you name it because QIODevice is the base class of the classes that manage these interfaces.

TechnoratiClass.prototype.getSearchResults = function(search) { var api_key = " key="; var callingAPI = "http://api.technorati.com/search"; var apiKey = "[YOUR API KEY]"; //"{{Key:key;http://api.technorati.com/}}"; var reqUrl = callingAPI; reqUrl += api_key + apiKey; reqUrl += "&query=" + search; // can be link or weblog reqUrl += "&format=rss"; // set the returning xml to rss format

Note that none of the preceding servers is typically intended for production use; instead, they are useful for small internal tasks for which you just need a quick HTTP endpoint to be used by other services internal to a system or subnet. And while most Python web frameworks will provide a way to run your application from the command line for debugging, most follow the lead of Django in recommending against using the development platform for debugging. However, a few Python web frameworks exist that not only provide their own built-in HTTP servers, but have also worked on their security and performance, so that they can be recommended for use in production. These pure-Python web servers can be very useful if you are writing an application that users will be installing locally, and you want to provide a web interface without having to ship a separate web server like Apache or nginx. Frameworks that offer a pure-Python integrated web server include CherryPy; Zope, and thus Grok and BFG; web2py; and web.py.

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