import ast

source = "/dev/sr0"
DvdInfo = subprocess.Popen(["lsdvd", "-Oy", source], stdout=subprocess.PIPE).communicate()[0]
dicString = '='.join(DvdInfo.split('=')[1:]).strip()
# oder einfacher, aber festverdrahtet:
#dicString = DvdInfo[8:]
dvdDic = ast.literal_eval(dicString)
print ...