Displays nested lists / dicts / tuples in an aligned hierarchy to make debugging easy. Accepts all variable types, including nested lists with any mixture of tuples / dictionaries / lists / numbers / strings. Analogous to the PHP print_r($var) function.
The nested set abstraction is a very nice way to store hierarchical data, for example places, in a database. It provides an easy way to say that Melbourne is within Victoria, which is within Australia, etc.</p> The calls to addChild() are expensive, so this model is slow to build, and bad if you do frequent updates. If you're building a read-only model though, it's much faster than ForeignKey('self') for determining ancestor/descendent relationships.
2 snippets posted so far.