A class to manipulate Adobe Photoshop Lightroom keywords.
For an example of using the library, see https://github.com/ericvaandering/MetadataScripts/blob/master/Photos/FindDuplicateKeywords.py and https://github.com/ericvaandering/MetadataScripts/blob/master/Photos/FindMissingSynonyms.py