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Here foo changes (rebinds) the variable x, but when you look at it in the end, it hasn t changed after all. That s because when you call foo a new namespace is created, which is used for the block inside foo. The assignment x = 42 is performed in this inner scope (the local namespace), and therefore it doesn t affect the x in the outer (global) scope. Variables that are used inside functions like this are called local variables (as opposed to global variables). The parameters work just like local variables, so there is no problem in having a parameter with the same name as a global variable: >>> ... >>> >>> >>> 2 def output(x): print x x = 1 y = 2 output(y)

Because we re on the topic of wonderful people who have aided the Magento community, we wanted to list the awesome apps and tutorials created by Branko and the Inchoo team. Magento s documentation is far from complete, and we owe a great deal of knowledge to these guys. As a prime example, we include links to two admin modules that are great skeleton templates to help you build customized modules:

The Upload Book Cover user story is performed by the administrator, George. When adding a book, George should be able to select an image and upload it to the Emporium site. This image is then shown to customers when they are viewing the details of a book.

So far, so good. But what if you want to access the global variables inside a function As long as you only want to read the value of the variable (that is, you don t want to rebind it), there is generally no problem: >>> def combine(parameter): print parameter + external ... >>> external = 'berry' >>> combine('Shrub') Shrubberry

CoolDash: Blank Magento extension for building admin system configuration area: http://inchoo.net/ecommerce/magento/cooldash-blank-magento-extensionfor-building-admin-system-configuration-area/ CoffeeFreak: Blank Magento extension for building main admin menu with sidebar and tabs: http://inchoo.net/ecommerce/magento/coffeefreak-blankmagento-extension-for-building-main-admin-menu-with-sidebar-and-tabs/

We don t have to reinvent the wheel to implement file upload functionality. Sebastian Kanthak has already implemented the file upload functionality we need and released it as the FileColumn plugin. The plugin contains view helpers and an extension to ActiveRecord that allows us to implement file upload easily. Install the FileColumn plugin by executing the following command: $ script/plugin install \ http://opensvn.csie.org/rails_file_column/plugins/file_column/trunk/ This downloads the latest version of the plugin from the Internet and installs it in the vendor/plugins/trunk directory. After the installation has finished, rename the trunk directory to file_column. Note that you need to restart WEBrick to activate the plugin.

There s also another site started by Branko that allows users to post their Magento snippets: http://snippi.net/. It s a valuable resource if you re looking for tips and tricks for Magento. A couple of other cool sites are as follows: Inchoo s site: These guys focus on designing and building Magento sites. The site offers valuable tips and tricks for all things Magento: http://inchoo.net. Branko Ajzele s site: Branko lives and breathes Magento full time. He shares his tips and even frustration with Magento s quarks on his blog. Definitely a guy that knows his stuff: http://activecodeline.com/

Tip For more information about FileColumn, visit http://www.kanthak.net/opensource/

Reading the value of global variables is not a problem in general, but one thing may make it problematic. If a local variable or parameter exists with the same name as the global variable you want to access, you can t do it directly. The global variable is shadowed by the local one. If needed, you can still gain access to the global variable by using the function globals, a close relative of vars, which returns a dictionary with the global variables. (locals returns a dictionary with the local variables.) For example, if you had a global variable called parameter in the previous example, you couldn t access it from within combine because you have a parameter with the same name. In a pinch, however, you could have referred to it as globals()['parameter']: >>> def combine(parameter): print parameter + globals()['parameter'] ... >>> parameter = 'berry' >>> combine('Shrub') Shrubberry

The last thing we want to mention is Magento s Bug Tracker: www.magentocommerce.com/bug-tracking If you run into an error, and there isn t any information in the community, the last place to check is its Bug Tracker.