You will need to install mutagen:
pip install mutagen
flacToItunes.py filenames...
Converts the specified FLAC files to ALAC using flac and afconvert.
Adds them to iTunes, set metadata in iTunes according to metadata found
in FLAC file. Finally, if the FLAC metadata contained a JPEG, adds this
as artwork for the track in iTunes.
If some metadata field remains empty in iTunes, you may have to provide
a mapping from the name of the FLAC metadata tag to whatever name iTunes
uses for that field. You can do that by extending the metadataMapping
dictionary found at the beginning of the python script.