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# Using multiple except clauses >>> x = 10 >>> y = 0 >>> try: ... z = x / y ... except NameError, err1: ... print err1 ... except ZeroDivisionError, err2: ... print 'You cannot divide a number by zero!' ... You cannot divide a number by zero! As mentioned previously, an exception is simply a class in Python. There are superclasses and subclasses for exceptions. You can catch a superclass exception to catch any of the exceptions that subclass that exception are thrown. For instance, if a program had a specific function that accepted either a list or dict object, it would make sense to catch a LookupError as opposed to finding a KeyError or IndexError separately. Look at the following example to see one way that this can be done. Listing 7-12. Catching a Superclass Exceptions # # # # In the following example, we define a function that will return a value from some container. The function accepts either lists or dictionary objects. The LookupError superclass is caught as opposed to checking for each of it's subclasses...namely KeyError and IndexError.

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I always feel I should be able to just take the SQL in Listing 7-14 and join the result with the Member table, as shown in Listing 7-15. However, standard SQL doesn t like having a nested query as part of the join.

>>> def find_value(obj, value): ... try: ... return obj[value] ... except LookupError, ex: ... return 'An exception has been raised, check your values and try again' ... # Create both a dict and a list and test the function by looking for a value that does # not exist in either container >>> >>> >>> 'An >>> 3 >>> 'An >>> mydict = {'test1':1,'test2':2} mylist = [1,2,3] find_value(mydict, 'test3') exception has been raised, check your values and try again' find_value(mylist, 2) find_value(mylist, 3) exception has been raised, check your values and try again'

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The last task for the application is removing a DVD from the library. The application passes the id of the element that will be removed to either the deleteDVD.aspx or deleteDVD.php page.

If multiple exception blocks have been coded, the first matching exception is the one that is caught. For instance, if we were to redesign the find_value function that was defined in the previous example, but instead raised each exception separately then the first matching exception would be raised. . .the others would be ignored. Let s see how this would work.

Listing 7-15. SQL to Retrieve Names by Joining the Member Table to Intersection (Doesn t Work) SELECT LastName, FirstName FROM Member m INNER JOIN (SELECT e1.MemberID FROM Entry e1 WHERE e1.TourID = 25 INTERSECT SELECT e2.MemberID FROM Entry e2 WHERE e2.TourID = 36) ON m.MemberID = e1.MemberID

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The deleteDVD.aspx page follows: <%@ Page Language="VB" %> <%@ import Namespace="System.Xml" %> <script runat="server"> Dim intDVDID as integer Dim myXmlDocument as XmlDocument = new XmlDocument() Dim rootNode as XMLElement Dim selectedDVD as XMLElement Sub Page_Load(Src As Object, E As EventArgs) intDVDID = request.querystring("id") myXmlDocument.Load (server.mappath("dvd.xml")) rootNode = myXmlDocument.DocumentElement selectedDVD = rootNode.childNodes(intDVDID-1) if Not Page.IsPostBack then rootNode.RemoveChild(selectedDVD) myXmlDocument.Save(Server.Mappath("dvd.xml")) lblMessage.text = "You have successfully deleted the DVD" end if end sub </script> <html> <head> <link href="styles.css" type="text/css" rel="stylesheet" /> </head> <body> <h1>Delete DVD</h1> <form runat="server"> <asp:Label id="lblMessage" runat="server" forecolor="Blue"></asp:Label> </form> </body> </html> This page is very simple. It starts with some declarations and variable definitions: <%@ Page Language="VB" %> <%@ import Namespace="System.Xml" %> <script runat="server"> Dim intDVDID as integer Dim myXmlDocument as XmlDocument = new XmlDocument() Dim rootNode as XMLElement Dim selectedDVD as XMLElement

Listing 7-13. Catching the First Matching Exceptions # Redefine the find_value() function to check for each exception separately # Only the first matching exception will be raised, others will be ignored. # So in these examples, the except LookupError code is never run. >>> def find_value(obj, value): ... try: ... return obj[value] ... except KeyError: ... return 'The specified key was not in the dict, please try again' ... except IndexError: ... return 'The specified index was out of range, please try again' ... except LookupError: ... return 'The specified key was not found, please try again' ... >>> find_value(mydict, 'test3') 'The specified key was not in the dict, please try again' >>> find_value(mylist, 3) 'The specified index was out of range, please try again' >>>

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