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If you want access to the exception itself in an except clause, you can use two arguments instead of one. (Note that even when you are catching multiple exceptions, you are only supplying except with one argument a tuple.) This can be useful (for example) if you want your program to keep running, but you want to log the error somehow (perhaps just printing it out to the user). The following is an example program that prints out the exception (if it occurs), but keeps running: try: x = input('Enter the first number: ') y = input('Enter the second number: ') print x/y except (ZeroDivisionError, TypeError), e: print e The except clause in this little program again catches two types of exceptions, but because you also explicitly catch the object itself, you can print it out so the user can see what happened. (You see a more useful application of this later in this chapter, in the section When All Is Well. )

Summary

// Prepare filters $filters = array('type' => 'simple'); // using SOAP method $results = $client->call($session_id, 'catalog_product.list', array($filters)); // returns the tree var_dump($results);

Here the loop is only broken (by the break statement in the else clause) when no exception is raised. In other words, as long as something wrong happens, the program keeps asking for new input. The following is an example run: Enter the first number: 1 Enter the second number: 0 Invalid input. Please try again. Enter the first number: 'foo' Enter the second number: 'bar' Invalid input. Please try again. Enter the first number: baz Invalid input. Please try again. Enter the first number: 10 Enter the second number: 2 x/y is 5 As mentioned previously, an alternative to using an empty except clause is to catch all exceptions of the Exception class (which will catch all exceptions of any subclass as well). You cannot be 100 percent certain that you ll catch everything then, because the code in your try/except statement may be naughty and use the old-fashioned string exceptions, or perhaps create a custom exception that doesn t subclass Exception. However, if you go with the except Exception version, you can use the technique from the section Catching the Object, earlier in this chapter, to print out a more instructive error message in your little division program: while 1: try: x = input('Enter the first number: ') y = input('Enter the second number: ') value = x/y print 'x/y is', value except Exception, e: print 'Invalid input:', e print 'Please try again' else: break The following is a sample run: Enter the first number: 1 Enter the second number: 0 Invalid input: integer division or modulo by zero Please try again Enter the first number: 'x' Enter the second number: 'y' Invalid input: unsupported operand type(s) for /: 'str' and 'str' Please try again Enter the first number: foo

In this chapter, we implemented a shopping cart for an online store. We used the Ajax capabilities in Ruby on Rails to implement a fast and interactive, but also backward-compatible shopping cart. In the course of implementing the shopping cart, we showed you how to use the has_many :through association join models with ActiveRecord classes and how to use the Rails controller filters and store information in the session hash. You saw how to put Rails helpers like pluralize to use and how to write your own link helpers. Our Ajax implementation demonstrated using the script.aculo.us JavaScript library, which is bundled with Rails, to create modern, Ajax-driven shopping carts. You also saw how to make sure your Ajax-driven site is also accessible to users whose browsers don t support JavaScript. Also, we covered using the Rails .rjs templates to update multiple items inside a web page with a single Ajax call.

Method: catalog_product.info ($product_id, $store_view_code, $attributes)