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In both Listings 8-11 and 8-12, we are averaging an expression, rather than just the values directly from the column of our table. We might want to do this for many reasons. Say in another database we have an Order table, which includes the columns Price and Quantity. The net value of each order can be found by multiplying the Price and Quantity. If we want to find the average value for all our orders, we can put the expression Price * Quantity in the parentheses, as in Listing 8-13.

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As mentioned in the previous section, the raise statement is used to throw or raise an exception in Python. We know that a try-except clause is needed if Python decides to raise an exception, but what if you d like to raise an exception of your own You can place a raise statement anywhere that you wish to raise a specified exception. There are a number of defined exceptions within the language which can be raised. For instance, NameError is raised when a specific piece of code is undefined or has no name. For a complete list of exceptions in Python, please visit 7. Listing 1-27. >>> raise NameError Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError If you wish to specify your own message within a raise then you can do so by raising a generic Exception, and then specifying your message on the statement as follows. Listing 1-28. >>> raise Exception('Custom Exception') Traceback (most recent call last): File "<stdin>", line 1, in <module> Exception: Custom Exception

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If users change the URL to http://localhost/weather/index.php continent=7643, one of two things can happen. Either the value 7643 refers to a continent in the database, or the id is invalid. In the first case, the application can display the subnavigation for that continent, but in the second case, it needs to display an error message. The application uses the following XML document structure for this scenario: < xml version="1.0" encoding="UTF-8" > <entries> <current>Error</current> <error>You appear to have selected an invalid continent</error> </entries> Instead of an <items> element, the document includes Error as the value of the <current> element. It also includes an <error> element with an error message that displays to the user. Scenario 3: Dealing with Subnavigation Items The most likely scenario is that the application displays subnavigation items. The structure of this type of XML document is similar to that shown in scenario 1. The difference is that the <items> element contains multiple <entry> elements: < xml version="1.0" encoding="UTF-8" > <entries> <current type="area" id="8">WA</current> <items> <linksto>city</linksto> <entry id="1">Albany</entry> <entry id="2">Bunbury</entry> <entry id="3">Geraldton</entry> <entry id="4">Perth</entry> </items> </entries> Each <entry> element has an id that corresponds to the id field in the database. It also contains the name of the navigation item in this case, the name of the city. Now let s see how to build the XML document to cope with these different scenarios. Building the XML Document The mk_navxml.php document starts by including weather.php: < php include_once('weather.php'); The page uses a variable called $xml to build the XML document. It starts by creating a new DomDocument: $xml = new DomDocument('1.0', 'UTF-8'); $xml->xmlStandalone = false;

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A program can be made up of one or more suites of code. In order to save a program so that it can be used later, we place the code into files on our computer. Files that contain Python code should contain a .py suffix such as my_code.py and so forth. These files are known as modules in the Python world. The import statement is used much like it is in other languages, it brings external modules or code into a program so that it can be used. This statement is ultimately responsible for reuse of code in multiple locations. The import statement allows us to save code into a flat file or script, and then use it in an application at a later time. If a class is stored in an external module that is named the same as the class itself, the import statement can be used to explicitly bring that class into an application. Similarly, if you wish to import only a specific identifier from another module into your current module, then the specific code can be named within using the syntax from <<module>> import <<specific code>>. Time to see some examples. Listing 1-29. # Import a module named TipCalculator import TipCalculator # Import a function tipCalculator from within a module called ExternalModule.py

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