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Note that it is usually bad practice to use except Exception since this will catch all exceptions and could easily mask logical errors in our code In this example, we might have intended to catch KeyErrors, but if n is 0, we will unintentionally and silently catch a ZeroDivisionError exception It is also possible to write except:, that is, to have no exception group at all An except block like this will catch any exception, including those that inherit BaseException but not Exception (these are not shown in Figure 41) This has the same problems as using except Exception, only worse, and should never normally be done If none of the except blocks matches the exception, Python will work its way up the call stack looking for a suitable exception handler If none is found the program will terminate and print the exception and a traceback on the console If no exceptions occur, any optional else block is executed And in all cases that is, if no exceptions occur, if an exception occurs and is handled, or if an exception occurs that is passed up the call stack any finally block s suite is always executed If no exception occurs, or if an exception occurs and is handled by one of the except blocks, the finally block s suite is executed at the end; but if an exception occurs that doesn t match, rst the finally block s suite is executed, and then the exception is passed up the call stack This guarantee of execution can be very useful when we want to ensure that resources are properly released Figure 42 illustrates the general try except finally block control ows

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Normal Flow try: # process except exception: # handle finally: # cleanup # continue here Handled Exception try: # process except exception: # handle finally: # cleanup # continue here Unhandled Exception try: # process except exception: # handle finally: # cleanup # go up call stack

Here is a nal version of the list_find() function, this time using exceptionhandling:

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def list_find(lst, target): try: index = lstindex(target) except ValueError: index = -1 return index

Here, we have effectively used the try except block to turn an exception into a return value; the same approach can also be used to catch one kind of exception and raise another instead a technique we will see shortly Python also offers a simpler try finally block which is sometimes useful:

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No matter what happens in the try block s suite (apart from the computer or program crashing!), the finally block s suite will be executed The with statement used with a context manager (both covered in 8) can be used to achieve a similar effect to using a try finally block One common pattern of use for try except finally blocks is for handling le errors For example, the noblankspy program reads a list of lenames on the command line, and for each one produces another le with the same name, but with its extension changed to nb, and with the same contents except for no blank lines Here s the program s read_data() function:

The WCF team has released a whitepaper on the performance of WCF (available at http://msdn2microsoftcom/en-us/library/bb310550aspx) The paper goes into much more detail and considers security settings such as transport, message, and mixed mode, and compares previous technologies such as NET Remoting, Web Service Enhancements, ASPNET Web Services, and Enterprise Services

def read_data(filename): lines = [] fh = None try: fh = open(filename, encoding="utf8") for line in fh: if linestrip(): linesappend(line) except (IOError, OSError) as err: print(err) return [] finally: if fh is not None: fhclose() return lines

We set the le object, fh, to None because it is possible that the open() call will fail, in which case nothing will be assigned to fh (so it will stay as None), and an exception will be raised If one of the exceptions we have speci ed occurs (IOError or OSError), after printing the error message we return an empty list But note that before returning, the finally block s suite will be executed, so the le will be safely closed if it had been successfully opened in the rst place Notice also that if an encoding error occurs, even though we don t catch the relevant exception (UnicodeDecodeError), the le will still be safely closed In such cases the finally block s suite is executed and then the exception is passed up the call stack there is no return value since the function nishes as a result of the unhandled exception And in this case, since there is no suitable except block to catch encoding error exceptions, the program will terminate and print a traceback We could have written the except clause slightly less verbosely:

Event-driven application launch is a new feature in MIDP 20 This feature makes it possible to create applications that can be launched at a preset time or that can respond to events generated by network services The ability to define applications that will be launched on a specific network protocol event enables the creation of new kinds of services that can monitor information in the network and can notify a MIDlet suite automatically when the information changes

except EnvironmentError as err: print(err) return []

Connected applications are applications that require both the client and the server to be running at the same time and reachable over a network

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