I have a buildbot property which I believe is a dictionary. It appears on the build page like this:

This property was set by an extract_fn which was returning a string converted to a dictionary.

My question is: How do I access this property as a key value pair?

For e.g.: Can I do Property('mydictionary[\'aaa\']') ? This doesn't seem to work. I need to access mydictionary['aaa'] in a build step.