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Listing 4-15. def fact(n): """Returns the factorial of n Computes the factorial of n recursively. Does not check its arguments if nonnegative integer or if would stack overflow. Use with care! """ if n in (0, 1): return 1 else: return n * fact(n - 1) Any such docstring, but with leading indentation stripped, becomes the __doc__ attribute of that function object. Incidentally, docstrings are also used for modules and classes, and they work exactly the same way. You can now use the help built-in function to get the docstring, or see them from various IDEs like PyDev for Eclipse and nbPython for NetBeans as part of the auto-complete. Listing 4-16. >>> help(fact) Help on function fact in module __main__: fact(n) Returns the factorial of n >>>

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xmlhttp.onreadystatechange = onLoad_LoadXMLHttp; function onLoad_LoadXMLHtpp() { if (xmlhttp.readyState == 4) { ....//do some processing } } Once the readyState value reaches 4, the code needs to check that the content loaded correctly by retrieving the status code of the response. If the status code is 200, the content loaded correctly; other values indicate an error: if (http_request.status == 200) { //success loading var textResponse = xmlhttp.responseText; var xmlDocumentResponse = xmlhttp.responseXML; } else { //error loading } You may want to add more sophisticated error handling to report error messages to the user. You can access the status error message using the statusText property. As shown in the previous example, you can capture the response as text using the responseText property, or as an XML document object using responseXML. If you choose the latter, you can then use the DOM to traverse the document tree. The best way to understand how the object works is to work through some simple examples. In this section, I ll work through the following examples: Making a HEAD request Displaying the contents of an XML document in the browser Using XMLHttpRequest with the DOM You need to run all of these examples through a web server such as Internet Information Services (IIS). If you use IIS, you ll need to save the files to a folder within C:\InetPub\wwwroot. You can then access the examples through http://localhost/foldername. I ll start by using Ajax to make a HEAD request.

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All functions return some value. In times2, we use the return statement to exit the function with that value. Functions can easily return multiple values at once by returning a tuple or other structure. The following is a simple example of a function that returns more than one value. In this case, the tip calculator returns the result of a tip based upon two percentage values. Listing 4-17. >>> def calc_tips(amount): ... return (amount * .18), (amount * .20) ... >>> calc_tips(25.25) (4.545, 5.050000000000001) A function can return at any time, and it can also return any object as its value. So you can have a function that looks like the following:

We can make a couple of simple joins between the Team table and Member table. If we want to know information about teams and also want to include information about the managers, we can take the Team table and join it with the Member table on the foreign key Manager, as shown in Listing 6-1 and Figure 6-3 (the figure shows the Access join diagram and just some of the columns of the resulting table).

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Listing 4-18. >>> def check_pos_perform_calc(num1, num2, func): ... if num1 > 0 and num2 > 0: ... return func(num1, num2) ... else: ... return 'Only positive numbers can be used with this function!' ... >>> def mult_values(value1, value2): ... return value1 * value2 ... >>> check_pos_perform_calc(3, 4, mult_values) 12 >>> check_pos_perform_calc(3, -44, mult_values) 'Only positive numbers can be used with this function!' If a return statement is not used, the value None is returned. There is no equivalent to a void method in Java, because every function in Python returns a value. However, the Python console will not show the return value when it s None, so you need to explicitly print it to see what is returned. Listing 4-19. >>> do_nothing() >>> print do_nothing() None

You can make a HEAD request to extract all or some of the headers of a document. You might use this to find the last modified date of a document or to find out its content type. You can find this example saved as getHeaders.htm. Figure 9-2 shows the headers for the document dvd.xml.

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