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So, you may wonder how to write a tuple containing a single value. This is a bit peculiar you have to include a comma, even though there is only one value: >>> 42 42 >>> 42, (42,) >>> (42,) (42,) The last two examples produce tuples of length one, while the first is not a tuple at all. The comma is crucial. Simply adding parentheses won t help: (42) is exactly the same as 42. One lonely comma, however, can change the value of an expression completely: >>> 3*(40+2) 126 >>> 3*(40+2,) (42, 42, 42)

Figure 4-3. A look at the Orders grid. Here you can filter which orders are displayed, change bulk order status, and create new orders. By default, orders are listed by the most Purchased On filter which displays orders from the most recent to the oldest. You can sort orders by clicking on any of the columns headers listed above the orders. These include: Order #, Purchased from (store), Purchased On, Bill to Name, Ship to Name, G.T. (Base), G.T. (Purchased), Status, and Action. Below the column headers are additional filtering options that include specific searching information, like a specific order number, purchase date, name, total amount, or status. To use the additional search features, enter in the specific information you are looking for and press search. Clicking the reset filter button to return the view to its default state. From the sales order grid, you can also manage orders in bulk using the pulldown labeled Actions. Here you can modify multiple orders from the settings canceled, hold, and unhold. You can also print invoices, packing slips, and credit memos. From the sales order grid, you can also create customer orders from inside the admin interface. To create a new order, simply click the Create New Order button on the Orders grid page (see Figures 4-4 and 4-5).

Taxes vary from country to country and from state to state. Check your local tax system for how to calculate taxes. As an example, if you live in the US and buy goods from an out-of-state store, then you are not required to pay sales tax. But, if you buy goods from a store located in your own state, the store charges you a sales tax, which is different for each state. Some goods are also exempt from sales taxes. See http://en.wikipedia.org/wiki/Sales_taxes_in_the_United_States for more information about sales taxes in the US. For general information about sales taxes, see http://en.wikipedia.org/wiki/Sales_tax. In Europe, most countries use a tax system called value-added tax (VAT). The VAT rate is different in each country. For example, in Finland, the standard VAT rate is 22%. See http://en.wikipedia.org/wiki/Value_added_tax for more information about VAT.

The tuple function works in pretty much the same way as list: It takes one sequence argument and converts it to a tuple.6 If the argument is already a tuple, it is returned unchanged: >>> tuple([1, 2, 3]) (1, 2, 3) >>> tuple('abc') ('a', 'b', 'c') >>> tuple((1, 2, 3)) (1, 2, 3)

Figure 4-4. Part 1 of creating an order from within the admin interface. View customer recent ativities and add products to the order.

Summary

As you may have gathered, tuples aren t very complicated and there isn t really much you can do with them except make them and access their elements, and you do this the same as with other sequences: >>> >>> 2 >>> (1, x = 1, 2, 3 x[1] x[0:2] 2) As you can see, slices of a tuple are also tuples, just as list slices are themselves lists.

Figure 4-5. Part 2 of creating an order from within the admin interface. Enter customer billing and shipping information, payment method, shipping method, comments, and submit the order.