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What I did with the little list comprehension in the previous section was to make a guess about what I was supposed to see in the copy module. However, you can get the correct answer directly from the module itself. In the full dir(copy) list, you may have noticed the name __all__. This is a variable containing a list similar to the one I created with list comprehension except that this list has been set in the module itself. Let s see what it contains: >>> copy.__all__ ['Error', 'error', 'copy', 'deepcopy'] My guess wasn t so bad after all. I got only one extra name (PyStringMap) that wasn t intended for my use. But where did this __all__ list come from, and why is it really there The first question is easy to answer. It was set in the copy module, like this (copied directly from copy.py): __all__ = ["Error", "error", "copy", "deepcopy"] So why is it there It defines the public interface of the module. More specifically, it tells the interpreter what it means to import all the names from this module. So if you use from copy import * you get only the four functions listed in the __all__ variable. To import PyStringMap, for example, you would have to be explicit, either importing copy and using copy.PyStringMap, or using from copy import PyStringMap Setting __all__ like this is actually a useful technique when writing modules too. Because you may have lots of variables, functions, and classes in your module that other programs might not need or want, it is only polite to filter them out. If you don t set __all__, the names exported in a starred import defaults to all global names in the module that don t begin with an underscore.

The customers tab allows you to add new customers, manage existing customers, create or modify customer groups, and view online customers.

Figure 1-2 illustrates how a request from a browser is routed through the Ruby on Rails implementation of MVC. Ruby on Rails stores all MVC-related files in the app directory, which is located in the application root directory.

The manage customers link provides an overview of every customer currently registered with your store. The overview page displays customer names, email address, customer group, telephone numbers, and additional information. You can filter how the overview page displays the list of customers or search for specific information in any of the provided fields: id number, name, email, group, telephone number, zip code, state/province, sign up date, and which web site they are assigned to. The overview page also allows you to apply bulk actions to customers. You can delete customers, subscribe customers to newsletters, unsubscribe customers to newsletters, and assign customers to specific customer groups (see Figure 4-29).

Until now, you ve been using your ingenuity and knowledge of various Python functions and special attributes to explore the copy module. The interactive interpreter is a very powerful tool for this sort of exploration because your mastery of the language is the only limit to how deeply you can probe a module. However, there is one standard function that gives you all the information you would normally need. That function is called help; let s try it on the copy function:

George has written the About Emporium user story on a piece of paper for us. He hands it over to us, and it reads as follows: Emporium should have an About page where the contact details and a brief description of Emporium are shown to the user.

Figure 4-29. Manage Customer grid view provides an overview of all the customers who have registered or placed orders from your store.