def get_subs_by_season(showid, lang, season):
url = SUBS_BY_SEASON.format(sid=showid, s=season, lang=lang)
data = get_content(url)
filenames = get_datas(data.getElementsByTagName('filename'))
links = get_datas(data.getElementsByTagName('downloadlink'))
eps = defaultdict(lambda: [])
for f, l in zip(filenames, links):
_, _, e = nameparser.get_ep_details(f)
eps[e].append((f, l))
return eps