'For each file that we have read descriptor data from this provides a
mapping of the form...
absolute path (str) => last modified unix timestamp (int)
This includes entries set through the
:func:`~stem.descriptor.reader.DescriptorReader.set_processed_files`
method. Each run resets this to only the files that were present during
that run.
:returns: **dict** with the absolute paths and unix timestamp for the last
modified times of the files we have processed'

def get_processed_files(self):

    return dict(((os.path.abspath(k), v) for (k, v) in list(self._processed_files.items())))
