def delete(cls, key):
if not cls.group:
raise ValueError()
# Delete from memory cache
cache[cls.group].delete(key)
# Delete from disk
if not os.path.exists(cls.group_path()):
os.makedirs(cls.group_path())
path = cls.item_path(key)
if not FileIO.exists(path):
return
FileIO.delete(path)
