Dictionaries

There are a few utility dictionaries available. All of them inherit from the base dict class, and can be used as drop-ins for the standard dict type. There are a few “primitive” base types that are then composed to more complex types. To use these types, import kutils.dicts.

• AttrDict: this dictionary provides access to the keys as attributes.
• NoneDict: this dictionary returns None for non-existent keys. This means it will not throw a KeyError for top-level keys; note that nested dictionaries may not be `NoneDict`s.
• StrDict: this dictionary returns an empty string for non-existent keys.
• DictDict: this dictionary returns an empty StrDict for non-existent keys. This is mostly useful for values that are nested dictionaries of keys.
• AttrNoneDict: this is a composition of the AttrDict and the NoneDict: it provides access to its keys as attributes, and returns None for missing keys or attributes; this means missing top-level keys and attributes will not throw KeyError or AttributeError.
• AttrDictDict: this is a composition of the AttrDict and DictDict: it provides access to its keys as attributes, and returns an empty StrDict for missing keys or attributes; this means missing top-level keys and attributes will not throw KeyError or AttributeError.