Recursive dictionary w/ yaml loading and variable substitution
The magicdict package provides loading YAML and acessing (getting and setting) arbitrary entries by sinple Key pathes, while also supporting default values as well as variable substition.
A key path (or just Key) is quite like a path name, but using "::" as delimiter. Non-scalar entries may have sub entries, that can be accessed by subkeys, similar fike or directories within another directory in a filesystem.
Keys starting with "@@" prefix have very special meaning: Instead of accessing sub entries, providing special functions, eg. referring to the entry's parent, etc. These also can also be used in variable references, eg. for relative references.
Scalar entries (strings) may contain references to other pathes, which are substituted when the entry is retrieved:
${foo}-${bar}
${one::two}
If an entry only contains exactly one reference, it returns exactly the referred entry (keeping it's type) w/o trying to convert it to string, thus allows referring to dicts or lists, and accessing their subkeys - similar to symbolic links in a filesystem.